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709.4235
Extended matter coupled to BF theory
Recently, a topological field theory of membrane-matter coupled to BF theory in arbitrary spacetime dimensions was proposed [1]. In this paper, we discuss various aspects of the four-dimensional theory. Firstly, we study classical solutions leading to an interpretation of the theory in terms of strings propagating on a flat spacetime. We also show that the general classical solutions of the theory are in one-to-one correspondence with solutions of Einstein's equations in the presence of distributional matter (cosmic strings). Secondly, we quantize the theory and present, in particular, a prescription to regularize the physical inner product of the canonical theory. We show how the resulting transition amplitudes are dual to evaluations of Feynman diagrams coupled to three-dimensional quantum gravity. Finally, we remove the regulator by proving the topological invariance of the transition amplitudes.
gr-qc
recently a topological field theory of membranematter coupled to bf theory in arbitrary spacetime dimensions was proposed 1 in this paper we discuss various aspects of the fourdimensional theory firstly we study classical solutions leading to an interpretation of the theory in terms of strings propagating on a flat spacetime we also show that the general classical solutions of the theory are in onetoone correspondence with solutions of einsteins equations in the presence of distributional matter cosmic strings secondly we quantize the theory and present in particular a prescription to regularize the physical inner product of the canonical theory we show how the resulting transition amplitudes are dual to evaluations of feynman diagrams coupled to threedimensional quantum gravity finally we remove the regulator by proving the topological invariance of the transition amplitudes
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709.4236
HST search for M subdwarf binaries
We present HST/ACS observations of 19 nearby M subdwarfs in a search for binary systems. Other than the wide common proper motion pair LHS 2140/2139, none of our sdM and esdM targets are found to be binaries. Our survey is sensitive to equal-luminosity companions at close (2-8 AU) separations, while sub-stellar secondaries could have been detected at separations in the range of 6-30 AU. To check for wide binaries, we have compared the POSS I and II images in a field of view as large as 10'x10', but could not detect a single co-moving star for any of the targets. Combining our results with those from Gizis & Reid, we have a binary fraction of 3% (1/28). Detection of a small number of M subdwarf binaries reported in the literature suggests a higher fraction than the one obtained here, probably comparable to that found for the more massive solar-type stars in the halo (13-15%). Comparison with the disk M dwarf fraction (25%) however suggests multiplicity to be rare among the lowest mass halo stars, implying the two populations formed under different initial conditions. The low binary fraction in our survey could be explained by selection biases. A decrease in multiplicity has been observed in the disk for masses below 0.1Msun, the peak in the disk mass function (MF). The globular cluster MF is found to peak at about 0.33Msun, with a decrease in the number of stars per unit mass below the peak mass. Our sample being composed of stars with masses between ~0.2 and 0.085 Msun suggests that a decrease in multiplicity similar to the disk may also be true for the halo stars, but perhaps below a mass of ~0.3Msun. A higher M subdwarf binary fraction may be obtained if the selected primaries have masses near or higher than the peak in the MF.
astro-ph
we present hstacs observations of 19 nearby m subdwarfs in a search for binary systems other than the wide common proper motion pair lhs 21402139 none of our sdm and esdm targets are found to be binaries our survey is sensitive to equalluminosity companions at close 28 au separations while substellar secondaries could have been detected at separations in the range of 630 au to check for wide binaries we have compared the poss i and ii images in a field of view as large as 10x10 but could not detect a single comoving star for any of the targets combining our results with those from gizis reid we have a binary fraction of 3 128 detection of a small number of m subdwarf binaries reported in the literature suggests a higher fraction than the one obtained here probably comparable to that found for the more massive solartype stars in the halo 1315 comparison with the disk m dwarf fraction 25 however suggests multiplicity to be rare among the lowest mass halo stars implying the two populations formed under different initial conditions the low binary fraction in our survey could be explained by selection biases a decrease in multiplicity has been observed in the disk for masses below 01msun the peak in the disk mass function mf the globular cluster mf is found to peak at about 033msun with a decrease in the number of stars per unit mass below the peak mass our sample being composed of stars with masses between 02 and 0085 msun suggests that a decrease in multiplicity similar to the disk may also be true for the halo stars but perhaps below a mass of 03msun a higher m subdwarf binary fraction may be obtained if the selected primaries have masses near or higher than the peak in the mf
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709.4237
Type Ia Supernova: Burning and Detonation in the Distributed Regime
A simple, semi-analytic representation is developed for nuclear burning in Type Ia supernovae in the special case where turbulent eddies completely disrupt the flame. The speed and width of the ``distributed'' flame front are derived. For the conditions considered, the burning front can be considered as a turbulent flame brush composed of corrugated sheets of well-mixed flames. These flames are assumed to have a quasi-steady-state structure similar to the laminar flame structure, but controlled by turbulent diffusion. Detonations cannot appear in the system as long as distributed flames are still quasi-steady-state, but this condition is violated when the distributed flame width becomes comparable to the size of largest turbulent eddies. When this happens, a transition to detonation may occur. For current best estimates of the turbulent energy, the most likely density for the transition to detonation is in the range 0.5 - 1.5 x 10^7 g cm^{-3}.
astro-ph
a simple semianalytic representation is developed for nuclear burning in type ia supernovae in the special case where turbulent eddies completely disrupt the flame the speed and width of the distributed flame front are derived for the conditions considered the burning front can be considered as a turbulent flame brush composed of corrugated sheets of wellmixed flames these flames are assumed to have a quasisteadystate structure similar to the laminar flame structure but controlled by turbulent diffusion detonations cannot appear in the system as long as distributed flames are still quasisteadystate but this condition is violated when the distributed flame width becomes comparable to the size of largest turbulent eddies when this happens a transition to detonation may occur for current best estimates of the turbulent energy the most likely density for the transition to detonation is in the range 05 15 x 107 g cm3
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709.4238
Generic local distinguishability and completely entangled subspaces
A subspace of a multipartite Hilbert space is completely entangled if it contains no product states. Such subspaces can be large with a known maximum size, S, approaching the full dimension of the system, D. We show that almost all subspaces with dimension less than or equal to S are completely entangled, and then use this fact to prove that n random pure quantum states are unambiguously locally distinguishable if and only if n does not exceed D-S. This condition holds for almost all sets of states of all multipartite systems, and reveals something surprising. The criterion is identical for separable and for nonseparable states: entanglement makes no difference.
quant-ph
a subspace of a multipartite hilbert space is completely entangled if it contains no product states such subspaces can be large with a known maximum size s approaching the full dimension of the system d we show that almost all subspaces with dimension less than or equal to s are completely entangled and then use this fact to prove that n random pure quantum states are unambiguously locally distinguishable if and only if n does not exceed ds this condition holds for almost all sets of states of all multipartite systems and reveals something surprising the criterion is identical for separable and for nonseparable states entanglement makes no difference
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709.4239
An introduction to the geometry of metric spaces
These informal notes deal with some basic properties of metric spaces, especially concerning lengths of curves.
math.MG
these informal notes deal with some basic properties of metric spaces especially concerning lengths of curves
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709.424
The Impact of Carbon Enhancement on Extra Mixing in Metal-Poor Stars
We critically examine the constraints imposed by carbon-enhanced metal-poor (CEMP) stars on the mixing mechanisms that operate in red giants. CEMP stars are created when the surface layers of a metal-poor dwarf are enriched with He-burning products via mass transfer from an evolved donor. The difference between main sequence (MS) and red giant CEMP abundances can be used as a diagnostic of the timescale for the mixing of the processed material into stellar interiors on the MS. Abundance trends with luminosity among red giant CEMP stars test theories of canonical extra mixing for low mass giants with a high bulk metallicity. We find a significant dilution in CN enrichment in giant CEMP stars relative to their MS precursors, and take this as evidence that thermohaline mixing induced by mean molecular weight inversions is ineffective in CEMP stars. This contradicts models that rely on efficient thermohaline mixing induced by small mu gradients in red giants, because such models would predict that MS CEMP stars with large mu inversions would be homogenized on a very short timescale. The data do not rule out slower MS thermohaline mixing comparable to previously published estimates. We also find that canonical extra mixing is strongly suppressed in CEMP giants relative to stars with the same iron abundance. A likely cause is the shift in the location of non-equilibrium CN processing relative to the steep mu gradient in the hydrogen burning shell, which also occurs in solar metallicity RGB stars. Implications for the mass accreted by CEMP stars and the mechanism for canonical extra mixing are discussed.
astro-ph
we critically examine the constraints imposed by carbonenhanced metalpoor cemp stars on the mixing mechanisms that operate in red giants cemp stars are created when the surface layers of a metalpoor dwarf are enriched with heburning products via mass transfer from an evolved donor the difference between main sequence ms and red giant cemp abundances can be used as a diagnostic of the timescale for the mixing of the processed material into stellar interiors on the ms abundance trends with luminosity among red giant cemp stars test theories of canonical extra mixing for low mass giants with a high bulk metallicity we find a significant dilution in cn enrichment in giant cemp stars relative to their ms precursors and take this as evidence that thermohaline mixing induced by mean molecular weight inversions is ineffective in cemp stars this contradicts models that rely on efficient thermohaline mixing induced by small mu gradients in red giants because such models would predict that ms cemp stars with large mu inversions would be homogenized on a very short timescale the data do not rule out slower ms thermohaline mixing comparable to previously published estimates we also find that canonical extra mixing is strongly suppressed in cemp giants relative to stars with the same iron abundance a likely cause is the shift in the location of nonequilibrium cn processing relative to the steep mu gradient in the hydrogen burning shell which also occurs in solar metallicity rgb stars implications for the mass accreted by cemp stars and the mechanism for canonical extra mixing are discussed
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709.4241
Permutahedra and generalized associahedra
Given a finite Coxeter system $(W,S)$ and a Coxeter element $c$, we construct a simple polytope whose outer normal fan is N. Reading's Cambrian fan $F_c$, settling a conjecture of Reading that this is possible. We call this polytope the $c$-generalized associahedron. Our approach generalizes Loday's realization of the associahedron (a type $A$ $c$-generalized associahedron whose outer normal fan is not the cluster fan but a coarsening of the Coxeter fan arising from the Tamari lattice) to any finite Coxeter group. A crucial role in the construction is played by the $c$-singleton cones, the cones in the $c$-Cambrian fan which consist of a single maximal cone from the Coxeter fan. Moreover, if $W$ is a Weyl group and the vertices of the permutahedron are chosen in a lattice associated to $W$, then we show that our realizations have integer coordinates in this lattice.
math.CO
given a finite coxeter system ws and a coxeter element c we construct a simple polytope whose outer normal fan is n readings cambrian fan f_c settling a conjecture of reading that this is possible we call this polytope the cgeneralized associahedron our approach generalizes lodays realization of the associahedron a type a cgeneralized associahedron whose outer normal fan is not the cluster fan but a coarsening of the coxeter fan arising from the tamari lattice to any finite coxeter group a crucial role in the construction is played by the csingleton cones the cones in the ccambrian fan which consist of a single maximal cone from the coxeter fan moreover if w is a weyl group and the vertices of the permutahedron are chosen in a lattice associated to w then we show that our realizations have integer coordinates in this lattice
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709.4242
Rational Expectations, psychology and inductive learning via moving thresholds
This work suggests modifications to a previously introduced class of heterogeneous agent models that allow for the inclusion of different types of agent motivations and behaviours in a unified way. The agents operate within a highly simplified environment where they are only able to be long or short one unit of the asset. The price of the asset is influenced by both an external information stream and the demand of the agents. The current strategy of each agent is defined by a pair of moving thresholds straddling the current price. When the price crosses either of the thresholds for a particular agent, that agent switches position and a new pair of thresholds is generated. Different kinds of threshold motion correspond to different sources of motivation, running the gamut from purely rational information-processing, through rational (but often undesirable) behaviour induced by perverse incentives and moral hazards, to purely psychological effects. As with the previous class of models, the fact that the simplest model of this kind precisely conforms to the Efficient Market Hypothesis allows causal relationships to be established between properties at the agent level and violations of EMH price statistics at the global level.
q-fin.TR physics.comp-ph
this work suggests modifications to a previously introduced class of heterogeneous agent models that allow for the inclusion of different types of agent motivations and behaviours in a unified way the agents operate within a highly simplified environment where they are only able to be long or short one unit of the asset the price of the asset is influenced by both an external information stream and the demand of the agents the current strategy of each agent is defined by a pair of moving thresholds straddling the current price when the price crosses either of the thresholds for a particular agent that agent switches position and a new pair of thresholds is generated different kinds of threshold motion correspond to different sources of motivation running the gamut from purely rational informationprocessing through rational but often undesirable behaviour induced by perverse incentives and moral hazards to purely psychological effects as with the previous class of models the fact that the simplest model of this kind precisely conforms to the efficient market hypothesis allows causal relationships to be established between properties at the agent level and violations of emh price statistics at the global level
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709.4243
Direct and inverse theorems in the theory of approximation by the Ritz method
For an arbitrary self-adjoint operator $B$ in a Hilbert space $H$, we present direct and inverse theorems establishing the relationship between the degree of smoothness of a vector $x \in H$ with respect to the operator $B$, the rate of convergence to zero of its best approximation by exponential-type entire vectors of the operator $B$, and the $k$-modulus of continuity of the vector $x$ with respect to the operator $B$. The results are used for finding a priori estimates for the Ritz approximate solutions of operator equations in a Hilbert space.
math.FA
for an arbitrary selfadjoint operator b in a hilbert space h we present direct and inverse theorems establishing the relationship between the degree of smoothness of a vector x in h with respect to the operator b the rate of convergence to zero of its best approximation by exponentialtype entire vectors of the operator b and the kmodulus of continuity of the vector x with respect to the operator b the results are used for finding a priori estimates for the ritz approximate solutions of operator equations in a hilbert space
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709.4244
Superconducting d-wave stripes in cuprates: Valence bond order coexisting with nodal quasiparticles
We point out that unidirectional bond-centered charge-density-wave states in cuprates involve electronic order in both s- and d-wave channels, with non-local Coulomb repulsion suppressing the s-wave component. The resulting bond-charge-density wave, coexisting with superconductivity, is compatible with recent photoemission and tunneling data and as well as neutron-scattering measurements, once long-range order is destroyed by slow fluctuations or glassy disorder. In particular, the real-space structure of d-wave stripes is consistent with the scanning-tunneling-microscopy measurements on both underdoped Bi2Sr2CaCu2O8+x and Ca2-xNaxCuO2Cl2 of Kohsaka et al. [Science 315, 1380 (2007), arXiv:cond-mat/0703309].
cond-mat.supr-con cond-mat.str-el
we point out that unidirectional bondcentered chargedensitywave states in cuprates involve electronic order in both s and dwave channels with nonlocal coulomb repulsion suppressing the swave component the resulting bondchargedensity wave coexisting with superconductivity is compatible with recent photoemission and tunneling data and as well as neutronscattering measurements once longrange order is destroyed by slow fluctuations or glassy disorder in particular the realspace structure of dwave stripes is consistent with the scanningtunnelingmicroscopy measurements on both underdoped bi2sr2cacu2o8x and ca2xnaxcuo2cl2 of kohsaka et al science 315 1380 2007 arxivcondmat0703309
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709.4245
Minimal conductivity in graphene: interaction corrections and ultraviolet anomaly
Conductivity of a disorder-free intrinsic graphene is studied to the first order in the long-range Coulomb interaction and is found to be \sigma=\sigma_0(1+0.01 g), where 'g' is the dimensionless ("fine structure") coupling constant. The calculations are performed using three different methods: i) electron polarization function, ii) Kubo formula for the conductivity, iii) quantum transport equation. Surprisingly, these methods yield different results unless a proper ultraviolet cut-off procedure is implemented, which requires that the interaction potential in the effective Dirac Hamiltonian is cut-off at small distances (large momenta).
cond-mat.mes-hall
conductivity of a disorderfree intrinsic graphene is studied to the first order in the longrange coulomb interaction and is found to be sigmasigma_01001 g where g is the dimensionless fine structure coupling constant the calculations are performed using three different methods i electron polarization function ii kubo formula for the conductivity iii quantum transport equation surprisingly these methods yield different results unless a proper ultraviolet cutoff procedure is implemented which requires that the interaction potential in the effective dirac hamiltonian is cutoff at small distances large momenta
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709.4246
Spin-orbital effects in magnetized quantum wires and spin chains
We present analysis of the interacting quantum wire problem in the presence of magnetic field and spin-orbital interaction. We show that an interesting interplay of Zeeman and spin-orbit terms, facilitated by the electron-electron interaction, results in the spin-density wave (SDW) state when the magnetic field and spin-orbit axes are orthogonal. We show that this instability is enhanced in a closely related problem of Heisenberg spin chain with asymmetric uniform Dzyaloshinskii-Moriya (DM) interaction. Magnetic field in the direction perpendicular to the DM anisotropy axis results in staggered long-range magnetic order along the orthogonal to the applied field direction. We explore consequences of the uniform DM interaction for the electron spin resonance (ESR) measurements, and point out that they provide way to probe right- and left-moving excitations of the spin chain separately.
cond-mat.mes-hall cond-mat.str-el
we present analysis of the interacting quantum wire problem in the presence of magnetic field and spinorbital interaction we show that an interesting interplay of zeeman and spinorbit terms facilitated by the electronelectron interaction results in the spindensity wave sdw state when the magnetic field and spinorbit axes are orthogonal we show that this instability is enhanced in a closely related problem of heisenberg spin chain with asymmetric uniform dzyaloshinskiimoriya dm interaction magnetic field in the direction perpendicular to the dm anisotropy axis results in staggered longrange magnetic order along the orthogonal to the applied field direction we explore consequences of the uniform dm interaction for the electron spin resonance esr measurements and point out that they provide way to probe right and leftmoving excitations of the spin chain separately
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709.4247
Modeling the Infrared Bow Shock at delta Velorum: Implications for Studies of Debris Disks and lambda Bootis Stars
We have discovered a bow shock shaped mid-infrared excess region in front of delta Velorum using 24 micron observations obtained with the Multiband Imaging Photometer for Spitzer (MIPS). The excess has been classified as a debris disk from previous infrared observations. Although the bow shock morphology was only detected in the 24 micron observations, its excess was also resolved at 70 micron. We show that the stellar heating of an ambient interstellar medium (ISM) cloud can produce the measured flux. Since delta Velorum was classified as a debris disk star previously, our discovery may call into question the same classification of other stars. We model the interaction of the star and ISM, producing images that show the same geometry and surface brightness as is observed. The modeled ISM is 15 times overdense relative to the average Local Bubble value, which is surprising considering the close proximity (24 pc) of delta Velorum. The abundance anomalies of lambda Bootis stars have been previously explained as arising from the same type of interaction of stars with the ISM. Low resolution optical spectra of delta Velorum show that it does not belong to this stellar class. The star therefore is an interesting testbed for the ISM accretion theory of the lambda Bootis phenomenon.
astro-ph
we have discovered a bow shock shaped midinfrared excess region in front of delta velorum using 24 micron observations obtained with the multiband imaging photometer for spitzer mips the excess has been classified as a debris disk from previous infrared observations although the bow shock morphology was only detected in the 24 micron observations its excess was also resolved at 70 micron we show that the stellar heating of an ambient interstellar medium ism cloud can produce the measured flux since delta velorum was classified as a debris disk star previously our discovery may call into question the same classification of other stars we model the interaction of the star and ism producing images that show the same geometry and surface brightness as is observed the modeled ism is 15 times overdense relative to the average local bubble value which is surprising considering the close proximity 24 pc of delta velorum the abundance anomalies of lambda bootis stars have been previously explained as arising from the same type of interaction of stars with the ism low resolution optical spectra of delta velorum show that it does not belong to this stellar class the star therefore is an interesting testbed for the ism accretion theory of the lambda bootis phenomenon
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709.4248
The SINFONI MgII Program for Line Emitters (SIMPLE): Discovering starbursts near QSO sight-lines
Low-ionization transitions such as the MgII 2796/2803 doublet trace cold gas in the vicinity of galaxies. It is not clear whether this gas is part of the interstellar medium of large proto-disks, part of dwarfs, or part of entrained material in supernovae-driven outflows. Studies based on MgII statistics, e.g. stacked images and clustering analysis, have invoked starburst-driven outflows where MgII absorbers are tracing the denser and colder gas of the outflow. A consequence of the outflow scenario is that the strongest absorbers ought to be associated with starbursts. We use the near-IR integral field spectrograph SINFONI to test whether starbursts are found around z~1 MgII absorbers. For 67% (14 out of 21) of the absorbers with rest-frame equivalent width larger than 2 AA, we do detect Ha in emission within 200 km/s of the predicted wavelength based on the \MgII redshift. The star-formation rate (SFR) inferred from Halpha ranges from 1 to 20 Msun/yr, i.e. showing a level of star-formation larger than in M82 by a factor of >4 on average. Our flux limit (3-sigma) corresponds to a SFR of 0.5 Msun/yr. We find evidence (at >95% confidence) for a correlation between SFR and equivalent width, indicating a physical connection between starburst phenomena and gas seen in absorption. In the cases where we can extract the velocity field, the host-galaxies reside in halos with mean mass <log M_h>=11.2 in good agreement with clustering measurements.
astro-ph
lowionization transitions such as the mgii 27962803 doublet trace cold gas in the vicinity of galaxies it is not clear whether this gas is part of the interstellar medium of large protodisks part of dwarfs or part of entrained material in supernovaedriven outflows studies based on mgii statistics eg stacked images and clustering analysis have invoked starburstdriven outflows where mgii absorbers are tracing the denser and colder gas of the outflow a consequence of the outflow scenario is that the strongest absorbers ought to be associated with starbursts we use the nearir integral field spectrograph sinfoni to test whether starbursts are found around z1 mgii absorbers for 67 14 out of 21 of the absorbers with restframe equivalent width larger than 2 aa we do detect ha in emission within 200 kms of the predicted wavelength based on the mgii redshift the starformation rate sfr inferred from halpha ranges from 1 to 20 msunyr ie showing a level of starformation larger than in m82 by a factor of 4 on average our flux limit 3sigma corresponds to a sfr of 05 msunyr we find evidence at 95 confidence for a correlation between sfr and equivalent width indicating a physical connection between starburst phenomena and gas seen in absorption in the cases where we can extract the velocity field the hostgalaxies reside in halos with mean mass log m_h112 in good agreement with clustering measurements
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709.4249
HI Imaging Observations of Superthin Galaxies. II. IC2233 and the Blue Compact Dwarf NGC2537
We have used the VLA to image the HI 21-cm line emission in the edge-on Sd galaxy IC2233 and the blue compact dwarf NGC2537. We also present new optical B,R, and H alpha imaging of IC2233 obtained with the WIYN telescope. Despite evidence of localized massive star formation, IC2233 has a low surface brightness disk with a low global star formation rate (~0.05 M_sun/yr), and no significant 21-cm radio continuum emission. The HI and ionized gas disks of IC2233 are clumpy and vertically distended, with scale heights comparable to the young stars. Both the stellar and HI disks of IC2233 appear flared, and we also find a vertically extended, rotationally anomalous HI component extending to z~2.4 kpc. The HI disk exhibits a mild lopsidedness as well as a global corrugation pattern with a period of ~7 kpc and an amplitude of ~150 pc. To our knowledge, this is the first time corrugations of the gas disk have been reported in an external galaxy; these undulations may be linked to bending instabilities or to underlying spiral structure and suggest that the disk is largely self-gravitating. Lying at a projected distance of 16.7' from IC2233, NGC2537 has an HI disk with a bright, tilted inner ring and a flocculent, dynamically cold outer region that extends to ~3.5D_25. Although NGC2537 is rotationally-dominated, it shows significant turbulence near its center. The inner rotation curve rises steeply, implying a strong central mass concentration. Our data indicate that IC2233 and NGC2537 do not constitute a bound pair and most likely lie at different distances. We also find no compelling evidence of a recent minor merger in either galaxy, suggesting that both are examples of small disk galaxies evolving in relative isolation. (Abridged)
astro-ph
we have used the vla to image the hi 21cm line emission in the edgeon sd galaxy ic2233 and the blue compact dwarf ngc2537 we also present new optical br and h alpha imaging of ic2233 obtained with the wiyn telescope despite evidence of localized massive star formation ic2233 has a low surface brightness disk with a low global star formation rate 005 m_sunyr and no significant 21cm radio continuum emission the hi and ionized gas disks of ic2233 are clumpy and vertically distended with scale heights comparable to the young stars both the stellar and hi disks of ic2233 appear flared and we also find a vertically extended rotationally anomalous hi component extending to z24 kpc the hi disk exhibits a mild lopsidedness as well as a global corrugation pattern with a period of 7 kpc and an amplitude of 150 pc to our knowledge this is the first time corrugations of the gas disk have been reported in an external galaxy these undulations may be linked to bending instabilities or to underlying spiral structure and suggest that the disk is largely selfgravitating lying at a projected distance of 167 from ic2233 ngc2537 has an hi disk with a bright tilted inner ring and a flocculent dynamically cold outer region that extends to 35d_25 although ngc2537 is rotationallydominated it shows significant turbulence near its center the inner rotation curve rises steeply implying a strong central mass concentration our data indicate that ic2233 and ngc2537 do not constitute a bound pair and most likely lie at different distances we also find no compelling evidence of a recent minor merger in either galaxy suggesting that both are examples of small disk galaxies evolving in relative isolation abridged
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709.425
The origin of star formation since z=1
The use of multiple integral field units with FLAMES/GIRAFFE at VLT has revolutionized investigations of distant galaxy kinematics. This facility may recover the velocity fields of almost all emission line galaxies with I_(AB)<22.5 at z<0.8. We have gathered a unique sample of 63 velocity fields at z=0.4-0.75, which are representative of M_stellar > 1.5*10^10 M_sun emission line W_0([OII])>15 \AA galaxies, and are unaffected by cosmic variance. Taking into account all galaxies -with or without emission lines- in that redshift range, we find that 42+/-7% of them have anomalous kinematics, including 26+/-7% with complex kinematics, i.e. not supported by either rotation or by dispersion. The large fraction of complex velocity fields suggests a large impact of merging in shaping the galaxies in the intermediate mass range. We discuss how this can be accommodated within the frame of current scenarios of galaxy formation, including for the Milky Way and M31.
astro-ph
the use of multiple integral field units with flamesgiraffe at vlt has revolutionized investigations of distant galaxy kinematics this facility may recover the velocity fields of almost all emission line galaxies with i_ab225 at z08 we have gathered a unique sample of 63 velocity fields at z04075 which are representative of m_stellar 151010 m_sun emission line w_0oii15 aa galaxies and are unaffected by cosmic variance taking into account all galaxies with or without emission lines in that redshift range we find that 427 of them have anomalous kinematics including 267 with complex kinematics ie not supported by either rotation or by dispersion the large fraction of complex velocity fields suggests a large impact of merging in shaping the galaxies in the intermediate mass range we discuss how this can be accommodated within the frame of current scenarios of galaxy formation including for the milky way and m31
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709.4251
Bulk viscosity in 2SC and CFL quark matter
The bulk viscosities of two color-superconducting phases, the color-flavor locked (CFL) phase and the 2SC phase, are computed and compared to the result for unpaired quark matter. In the case of the CFL phase, processes involving kaons and the superfluid mode give the largest contribution to the bulk viscosity since all fermionic modes are gapped. In the case of the 2SC phase, ungapped fermionic modes are present and the process u+d <-> u+s provides the dominant contribution. In both cases, the bulk viscosity can become larger than that of the unpaired phase for sufficiently large temperatures (T >~ 1 MeV for CFL, T >~ 0.1 MeV for 2SC). Bulk viscosity (as well as shear viscosity) is important for the damping of r-modes in compact stars and thus can potentially be used as an indirect signal for the presence or absence of color-superconducting quark matter.
nucl-th astro-ph hep-ph
the bulk viscosities of two colorsuperconducting phases the colorflavor locked cfl phase and the 2sc phase are computed and compared to the result for unpaired quark matter in the case of the cfl phase processes involving kaons and the superfluid mode give the largest contribution to the bulk viscosity since all fermionic modes are gapped in the case of the 2sc phase ungapped fermionic modes are present and the process ud us provides the dominant contribution in both cases the bulk viscosity can become larger than that of the unpaired phase for sufficiently large temperatures t 1 mev for cfl t 01 mev for 2sc bulk viscosity as well as shear viscosity is important for the damping of rmodes in compact stars and thus can potentially be used as an indirect signal for the presence or absence of colorsuperconducting quark matter
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709.4252
Global Models for the Evolution of Embedded, Accreting Protostellar Disks
Most analytic work to date on protostellar disks has focused on those in isolation from their environments. However, observations are now beginning to probe the earliest, most embedded phases of star formation, during which disks are rapidly accreting from their parent cores and cannot be modeled in isolation. We present a simple, one-zone model of protostellar accretion disks with high mass infall rates. Our model combines a self-consistent calculation of disk temperatures with an approximate treatment of angular momentum transport via two mechanisms. We use this model to survey the properties of protostellar disks across a wide range of stellar masses and evolutionary times, and make predictions for disks' masses, sizes, spiral structure, and fragmentation that will be directly testable by future large-scale surveys of deeply embedded disks. We define a dimensionless accretion-rotation parameter which, in conjunction with the disk's temperature, controls the disk evolution. We track the dominant mode of angular momentum transport, and demonstrate that for stars with final masses greater than roughly one solar mass, gravitational instabilities are the most important mechanism as most of the mass accumulates. We predict that binary formation through disk fission, fragmentation of the disk into small objects, and spiral arm strength all increase in importance to higher stellar masses.
astro-ph
most analytic work to date on protostellar disks has focused on those in isolation from their environments however observations are now beginning to probe the earliest most embedded phases of star formation during which disks are rapidly accreting from their parent cores and cannot be modeled in isolation we present a simple onezone model of protostellar accretion disks with high mass infall rates our model combines a selfconsistent calculation of disk temperatures with an approximate treatment of angular momentum transport via two mechanisms we use this model to survey the properties of protostellar disks across a wide range of stellar masses and evolutionary times and make predictions for disks masses sizes spiral structure and fragmentation that will be directly testable by future largescale surveys of deeply embedded disks we define a dimensionless accretionrotation parameter which in conjunction with the disks temperature controls the disk evolution we track the dominant mode of angular momentum transport and demonstrate that for stars with final masses greater than roughly one solar mass gravitational instabilities are the most important mechanism as most of the mass accumulates we predict that binary formation through disk fission fragmentation of the disk into small objects and spiral arm strength all increase in importance to higher stellar masses
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709.4253
Finitistic dimension through infinite projective dimension
We show that an artin algebra having at most three radical layers of infinite projective dimension has finite finitistic dimension, generalizing the known result for algebras with vanishing radical cube.
math.RT
we show that an artin algebra having at most three radical layers of infinite projective dimension has finite finitistic dimension generalizing the known result for algebras with vanishing radical cube
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709.4254
Measurement of the muon charge asymmetry from W boson decays
We present a measurement of the muon charge asymmetry from W boson decays using 0.3 fb^{-1} of data collected at \sqrt{s}=1.96 GeV between 2002 and 2004 with the D0 detector at the Fermilab Tevatron ppbar Collider. We compare our findings with expectations from next-to-leading-order calculations performed using the CTEQ6.1M and MRST04 NLO parton distribution functions. Our findings can be used to constrain future parton distribution function fits.
hep-ex
we present a measurement of the muon charge asymmetry from w boson decays using 03 fb1 of data collected at sqrts196 gev between 2002 and 2004 with the d0 detector at the fermilab tevatron ppbar collider we compare our findings with expectations from nexttoleadingorder calculations performed using the cteq61m and mrst04 nlo parton distribution functions our findings can be used to constrain future parton distribution function fits
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709.4255
Arithmetic duality theorems for 1-motives over function fields
In this paper we obtain a Poitou-Tate exact sequence for finite and flat group schemes over a global function field. We also extend the duality theorems for 1-motives over number fields obtained by D.Harari and T.Szamuely to the function field case.
math.NT math.AG
in this paper we obtain a poitoutate exact sequence for finite and flat group schemes over a global function field we also extend the duality theorems for 1motives over number fields obtained by dharari and tszamuely to the function field case
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709.4256
Comment on ``Elastic Stabilization of a Single-Domain Ferroelectric State in Nanoscale Capacitors and Tunnel Junctions" [N.A. Pertsev and H. Kohlstedt, Phys. Rev. Lett. 98, 257603 (2007).]
In a recent Letter [N.A. Pertsev and H. Kohlstedt, Phys. Rev. Lett. 98, 257603 (2007)] the authors claim that "even nanoscale capacitors and tunnel junctions may have out of plane polarization sufficient for memory applications." Here we show in an elementary way that this conclusion is not substantiated by their calculations and that they should have come to the opposite conclusion within their approximations.
cond-mat.mtrl-sci cond-mat.stat-mech
in a recent letter na pertsev and h kohlstedt phys rev lett 98 257603 2007 the authors claim that even nanoscale capacitors and tunnel junctions may have out of plane polarization sufficient for memory applications here we show in an elementary way that this conclusion is not substantiated by their calculations and that they should have come to the opposite conclusion within their approximations
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709.4257
Thermodynamical Analogy Between BTZ Black Holes and Effective String Theory
In this paper we study the first law of thermodynamics for the (2+1) dimensional BTZ rotating black hole considering a pair of thermodinamical systems constructed with the two horizons of this solution. We show that these two systems are similar to the right and left movers of string theory and that the temperature associated with the black hole is the harmonic mean of the temperatures associated with these two systems.
gr-qc
in this paper we study the first law of thermodynamics for the 21 dimensional btz rotating black hole considering a pair of thermodinamical systems constructed with the two horizons of this solution we show that these two systems are similar to the right and left movers of string theory and that the temperature associated with the black hole is the harmonic mean of the temperatures associated with these two systems
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709.4258
Fractional statistics of topological defects in graphene and related structures
We show that fractional charges bound to topological defects in the recently proposed time-reversal-invariant models on honeycomb and square lattices obey fractional statistics. The effective low-energy description is given in terms of a `doubled' level-2 Chern-Simons field theory, which is parity and time-reversal invariant and implies two species of semions (particles with statistical angle pi/2) labeled by a new emergent quantum number that we identify as the fermion axial charge.
cond-mat.str-el cond-mat.mes-hall
we show that fractional charges bound to topological defects in the recently proposed timereversalinvariant models on honeycomb and square lattices obey fractional statistics the effective lowenergy description is given in terms of a doubled level2 chernsimons field theory which is parity and timereversal invariant and implies two species of semions particles with statistical angle pi2 labeled by a new emergent quantum number that we identify as the fermion axial charge
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709.4259
Unravelling Strings at the LHC
We construct LHC signature footprints for four semi-realistic string/$M$ theory vacua with an MSSM visible sector. We find that they all give rise to limited regions in LHC signature space, and are qualitatively different from each other for understandable reasons. We also propose a technique in which correlations of LHC signatures can be effectively used to distinguish among these string theory vacua. We expect the technique to be useful for more general string vacua. We argue that further systematic analysis with this approach will allow LHC data to disfavor or exclude major ``corners'' of string/$M$ theory and favor others. The technique can be used with limited integrated luminosity and improved.
hep-ph hep-ex hep-th
we construct lhc signature footprints for four semirealistic stringm theory vacua with an mssm visible sector we find that they all give rise to limited regions in lhc signature space and are qualitatively different from each other for understandable reasons we also propose a technique in which correlations of lhc signatures can be effectively used to distinguish among these string theory vacua we expect the technique to be useful for more general string vacua we argue that further systematic analysis with this approach will allow lhc data to disfavor or exclude major corners of stringm theory and favor others the technique can be used with limited integrated luminosity and improved
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709.426
Geometric resonance cooling of polarizable particles in an optical waveguide
In the radiation field of an optical waveguide, the Rayleigh scattering of photons is shown to result in a strongly velocity-dependent force on atoms. The pump field, which is injected in the fundamental branch of the waveguide, is favorably scattered by a moving atom into one of the transversely excited branches of propagating modes. All fields involved are far detuned from any resonances of the atom. For a simple polarizable particle, a linear friction force coefficient comparable to that of cavity cooling can be achieved.
quant-ph
in the radiation field of an optical waveguide the rayleigh scattering of photons is shown to result in a strongly velocitydependent force on atoms the pump field which is injected in the fundamental branch of the waveguide is favorably scattered by a moving atom into one of the transversely excited branches of propagating modes all fields involved are far detuned from any resonances of the atom for a simple polarizable particle a linear friction force coefficient comparable to that of cavity cooling can be achieved
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709.4261
Overview of the New Horizons Science Payload
The New Horizons mission was launched on 2006 January 19, and the spacecraft is heading for a flyby encounter with the Pluto system in the summer of 2015. The challenges associated with sending a spacecraft to Pluto in less than 10 years and performing an ambitious suite of scientific investigations at such large heliocentric distances (> 32 AU) are formidable and required the development of lightweight, low power, and highly sensitive instruments. This paper provides an overview of the New Horizons science payload, which is comprised of seven instruments. Alice provides spatially resolved ultraviolet spectroscopy. The Ralph instrument has two components: the Multicolor Visible Imaging Camera (MVIC), which performs panchromatic and color imaging, and the Linear Etalon Imaging Spectral Array (LEISA), which provides near-infrared spectroscopic mapping capabilities. The Radio Experiment (REX) is a component of the New Horizons telecommunications system that provides both occultation and radiometry capabilities. The Long Range Reconnaissance Imager (LORRI) provides high sensitivity, high spatial resolution optical imaging capabilities. The Solar Wind at Pluto (SWAP) instrument measures the density and speed of solar wind particles. The Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) measures energetic protons and CNO ions. The Venetia Burney Student Dust Counter (VB-SDC) is used to record dust particle impacts during the cruise phases of the mission.
astro-ph
the new horizons mission was launched on 2006 january 19 and the spacecraft is heading for a flyby encounter with the pluto system in the summer of 2015 the challenges associated with sending a spacecraft to pluto in less than 10 years and performing an ambitious suite of scientific investigations at such large heliocentric distances 32 au are formidable and required the development of lightweight low power and highly sensitive instruments this paper provides an overview of the new horizons science payload which is comprised of seven instruments alice provides spatially resolved ultraviolet spectroscopy the ralph instrument has two components the multicolor visible imaging camera mvic which performs panchromatic and color imaging and the linear etalon imaging spectral array leisa which provides nearinfrared spectroscopic mapping capabilities the radio experiment rex is a component of the new horizons telecommunications system that provides both occultation and radiometry capabilities the long range reconnaissance imager lorri provides high sensitivity high spatial resolution optical imaging capabilities the solar wind at pluto swap instrument measures the density and speed of solar wind particles the pluto energetic particle spectrometer science investigation pepssi measures energetic protons and cno ions the venetia burney student dust counter vbsdc is used to record dust particle impacts during the cruise phases of the mission
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709.4262
Nonperturbative Instability of AdS_5 x S^5/Z_k
We study the AdS/CFT correspondence with boundary conditions AdS_5 x S^5/Z_k, where the Z_k acts freely but breaks all supersymmetry. While there are closed string tachyons at small 't Hooft coupling, there are no tachyons at large coupling. Nevertheless, we show that there is a nonperturbative instability directly analogous to the decay of the Kaluza-Klein vacuum. We discuss the implications of this instability for the strongly coupled dual field theory, and compare with earlier studies of this theory at weak coupling.
hep-th
we study the adscft correspondence with boundary conditions ads_5 x s5z_k where the z_k acts freely but breaks all supersymmetry while there are closed string tachyons at small t hooft coupling there are no tachyons at large coupling nevertheless we show that there is a nonperturbative instability directly analogous to the decay of the kaluzaklein vacuum we discuss the implications of this instability for the strongly coupled dual field theory and compare with earlier studies of this theory at weak coupling
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709.4263
On Cobweb posets tiling problem
Kwasniewski's cobweb posets uniquely represented by directed acyclic graphs are such a generalization of the Fibonacci tree that allows joint combinatorial interpretation for all of them under admissibility condition. This interpretation was derived in the source papers and it entailes natural enquieres already formulated therein. In our note we response to one of those problems. This is a tiling problem. Our observations on tiling problem include proofs of tiling's existence for some cobweb-admissible sequences. We show also that not all cobwebs admit tiling as defined below.
math.CO cs.DM
kwasniewskis cobweb posets uniquely represented by directed acyclic graphs are such a generalization of the fibonacci tree that allows joint combinatorial interpretation for all of them under admissibility condition this interpretation was derived in the source papers and it entailes natural enquieres already formulated therein in our note we response to one of those problems this is a tiling problem our observations on tiling problem include proofs of tilings existence for some cobwebadmissible sequences we show also that not all cobwebs admit tiling as defined below
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709.4264
Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect
We present a theoretical study of a superconducting charge qubit dispersively coupled to a transmission line resonator. Starting from a master equation description of this coupled system and using a polaron transformation, we obtain an exact effective master equation for the qubit. We then use quantum trajectory theory to investigate the measurement of the qubit by continuous homodyne measurement of the resonator out-field. Using the same porlaron transformation, a stochastic master equation for the conditional state of the qubit is obtained. From this result, various definitions of the measurement time are studied. Furthermore, we find that in the limit of strong homodyne measurement, typical quantum trajectories for the qubit exhibit a crossover from diffusive to jump-like behavior. Finally, in the presence of Rabi drive on the qubit, the qubit dynamics is shown to exhibit quantum Zeno behavior.
cond-mat.mes-hall cond-mat.supr-con quant-ph
we present a theoretical study of a superconducting charge qubit dispersively coupled to a transmission line resonator starting from a master equation description of this coupled system and using a polaron transformation we obtain an exact effective master equation for the qubit we then use quantum trajectory theory to investigate the measurement of the qubit by continuous homodyne measurement of the resonator outfield using the same porlaron transformation a stochastic master equation for the conditional state of the qubit is obtained from this result various definitions of the measurement time are studied furthermore we find that in the limit of strong homodyne measurement typical quantum trajectories for the qubit exhibit a crossover from diffusive to jumplike behavior finally in the presence of rabi drive on the qubit the qubit dynamics is shown to exhibit quantum zeno behavior
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709.4265
Multi-symmetry and Multi-band Superconductivity in Filled-skutterudites PrOs$_4$Sb$_{12}$ and PrRu$_4$Sb$_{12}$
Thermal conductivity measurements were performed on single crystal samples of the superconducting filled skutterudite compounds PrOs$_4$Sb$_{12}$ and PrRu$_4$Sb$_{12}$ both as a function of temperature and magnetic field applied perpendicular to the heat current. In zero magnetic field, the low temperature electronic thermal conductivity of PrRu$_4$Sb$_{12}$ is vanishingly small, consistent with a fully-gapped Fermi surface. For PrOs$_4$Sb$_{12}$, however, we find clear evidence for residual electronic conduction as the temperature tends to zero Kelvin which is consistent with the presence of nodes in the superconducting energy gap. The field dependence of the electronic conductivity for both compounds shows a rapid rise immediately above H$_{c1}$ and significant structure over the entire vortex state. In the fully gapped superconductor PrRu$_4$Sb$_{12}$, this is interpreted in terms of multi-band effects. In PrOs$_4$Sb$_{12}$, we consider the Doppler shift of nodal quasiparticles at low fields and multiband effects at higher fields.
cond-mat.supr-con cond-mat.str-el
thermal conductivity measurements were performed on single crystal samples of the superconducting filled skutterudite compounds pros_4sb_12 and prru_4sb_12 both as a function of temperature and magnetic field applied perpendicular to the heat current in zero magnetic field the low temperature electronic thermal conductivity of prru_4sb_12 is vanishingly small consistent with a fullygapped fermi surface for pros_4sb_12 however we find clear evidence for residual electronic conduction as the temperature tends to zero kelvin which is consistent with the presence of nodes in the superconducting energy gap the field dependence of the electronic conductivity for both compounds shows a rapid rise immediately above h_c1 and significant structure over the entire vortex state in the fully gapped superconductor prru_4sb_12 this is interpreted in terms of multiband effects in pros_4sb_12 we consider the doppler shift of nodal quasiparticles at low fields and multiband effects at higher fields
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709.4266
Ontological models and the interpretation of contextuality
Studying the extent to which realism is compatible with quantum mechanics teaches us something about the quantum mechanical universe, regardless of the validity of such realistic assumptions. It has also recently been appreciated that these kinds of studies are fruitful for questions relating to quantum information and computation. Motivated by this, we extend the ontological model formalism for realistic theories to describe a set of theories emphasizing the role of measurement and preparation devices by introducing `hidden variables' to describe them. We illustrate both the ontological model formalism and our generalization of it through a series of example models taken from the literature. Our extension of the formalism allows us to quantitatively analyze the meaning contextuality (a constraint on successful realistic theories), finding that - taken at face-value - it can be realized as a natural interaction between the configurations of a system and measurement device. However, we also describe a property that we call deficiency, which follows from contextuality, but does not admit such a natural interpretation. Loosely speaking, deficiency breaks a symmetry between preparations and measurements in quantum mechanics. It is the property that the set of ontic states which a system prepared in quantum state psi may actually be in, is strictly smaller than the set of ontic states which would reveal the measurement outcome psi with certainty.
quant-ph
studying the extent to which realism is compatible with quantum mechanics teaches us something about the quantum mechanical universe regardless of the validity of such realistic assumptions it has also recently been appreciated that these kinds of studies are fruitful for questions relating to quantum information and computation motivated by this we extend the ontological model formalism for realistic theories to describe a set of theories emphasizing the role of measurement and preparation devices by introducing hidden variables to describe them we illustrate both the ontological model formalism and our generalization of it through a series of example models taken from the literature our extension of the formalism allows us to quantitatively analyze the meaning contextuality a constraint on successful realistic theories finding that taken at facevalue it can be realized as a natural interaction between the configurations of a system and measurement device however we also describe a property that we call deficiency which follows from contextuality but does not admit such a natural interpretation loosely speaking deficiency breaks a symmetry between preparations and measurements in quantum mechanics it is the property that the set of ontic states which a system prepared in quantum state psi may actually be in is strictly smaller than the set of ontic states which would reveal the measurement outcome psi with certainty
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709.4267
Doping Dependence of Vortex Regimes in Y$_{1-x}$Pr$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-\delta}$ Single Crystals
Magnetic relaxation measurements on a series of Y$_{1-x}$Pr$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-\delta}$ ($x = 0.13, 0.34, 0.47$) single crystals were performed over a large field and temperature range in order to investigate the characteristics of the vortex matter across the second magnetization peak (SMP). The magnitude of the SMP varies non-monotonically with the Pr concentration; i.e., the irreversible magnetization normalized by its value at the onset field $H_{on}$ displays a maximum for the $x = 0.34$ single crystal. The two characteristic fields, $H_{on}$ and $H_{sp}$, follow different temperature $T$ dependences: $H_{on} \propto T^{\nu_{on}}$ and $H_{sp} \propto [1-(T/T_{c})^{2}]^{\nu_{sp}}$. The extracted values of the apparent activation energy $U^\ast$ and the creep exponent $\mu$ display a maximum at a field $H_{on} < H^\ast < H_{sp}$. Their field dependences point toward the coexistence of both elastic and plastic creep for $H > H_{on}$. The degree of participation of each creep mechanism is determined by the charge carrier density, which controls both the elastic properties of the vortex matter and the pinning potential.
cond-mat.supr-con cond-mat.str-el
magnetic relaxation measurements on a series of y_1xpr_xba_2cu_3o_7delta x 013 034 047 single crystals were performed over a large field and temperature range in order to investigate the characteristics of the vortex matter across the second magnetization peak smp the magnitude of the smp varies nonmonotonically with the pr concentration ie the irreversible magnetization normalized by its value at the onset field h_on displays a maximum for the x 034 single crystal the two characteristic fields h_on and h_sp follow different temperature t dependences h_on propto tnu_on and h_sp propto 1tt_c2nu_sp the extracted values of the apparent activation energy uast and the creep exponent mu display a maximum at a field h_on hast h_sp their field dependences point toward the coexistence of both elastic and plastic creep for h h_on the degree of participation of each creep mechanism is determined by the charge carrier density which controls both the elastic properties of the vortex matter and the pinning potential
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709.4268
Coherence lifetimes of excitations in an atomic condensate due to the thin spectrum
We study the quantum coherence properties of a finite sized atomic condensate using a toy-model and the thin spectrum model formalism. The decoherence time for a condensate in the ground state, nominally taken as a variational symmetry breaking state, is investigated for both zero and finite temperatures. We also consider the lifetimes for Bogoliubov quasi-particle excitations, and contrast them to the observability window determined by the ground state coherence time. The lifetimes are shown to exhibit a general characteristic dependence on the temperature, determined by the thin spectrum accompanying the spontaneous symmetry breaking ground state.
quant-ph cond-mat.soft
we study the quantum coherence properties of a finite sized atomic condensate using a toymodel and the thin spectrum model formalism the decoherence time for a condensate in the ground state nominally taken as a variational symmetry breaking state is investigated for both zero and finite temperatures we also consider the lifetimes for bogoliubov quasiparticle excitations and contrast them to the observability window determined by the ground state coherence time the lifetimes are shown to exhibit a general characteristic dependence on the temperature determined by the thin spectrum accompanying the spontaneous symmetry breaking ground state
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709.4269
Electroweak Model Without A Higgs Particle
An electroweak model is formulated in a finite, four-dimensional quantum field theory without a Higgs particle. The W and Z masses are induced from the electroweak symmetry breaking of one-loop vacuum polarization graphs. The theory contains only the observed particle spectrum of the standard model. In terms of the observed twelve lepton and quark masses, a loop calculation of the non-local electroweak energy scale $\Lambda_W$ and $\rho$ predicts the values $\Lambda_W(M_Z)=541$ GeV and $\rho(M_Z)=0.993$, yielding $s^2_Z\equiv\sin^2\theta_W(M_Z)=0.21686\pm 0.00097$. Possible ways to detect a non-local signal in scattering amplitudes involving loop graphs at the LHC are discussed. Fermion masses are generated from a ``mass gap'' equation obtained from the lowest order, finite fermion self-energy with a broken symmetry vacuum state. The cross section for $W_L^+ W_L^-\to W_L^+ W_L^-$ is predicted to vanish for $\sqrt{s} > {1 \rm TeV}$, avoiding a violation of the unitarity bound. The Brookhaven National Laboratory measurement of the anomalous magnetic moment of the muon and the residual difference between the measured value and the standard model can provide a test of a non-local deviation from the standard model.
hep-ph
an electroweak model is formulated in a finite fourdimensional quantum field theory without a higgs particle the w and z masses are induced from the electroweak symmetry breaking of oneloop vacuum polarization graphs the theory contains only the observed particle spectrum of the standard model in terms of the observed twelve lepton and quark masses a loop calculation of the nonlocal electroweak energy scale lambda_w and rho predicts the values lambda_wm_z541 gev and rhom_z0993 yielding s2_zequivsin2theta_wm_z021686pm 000097 possible ways to detect a nonlocal signal in scattering amplitudes involving loop graphs at the lhc are discussed fermion masses are generated from a mass gap equation obtained from the lowest order finite fermion selfenergy with a broken symmetry vacuum state the cross section for w_l w_lto w_l w_l is predicted to vanish for sqrts 1 rm tev avoiding a violation of the unitarity bound the brookhaven national laboratory measurement of the anomalous magnetic moment of the muon and the residual difference between the measured value and the standard model can provide a test of a nonlocal deviation from the standard model
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709.427
New Horizons: Anticipated Scientific Investigations at the Pluto System
The New Horizons spacecraft will achieve a wide range of measurement objectives at the Pluto system, including color and panchromatic maps, 1.25-2.50 micron spectral images for studying surface compositions, and measurements of Pluto's atmosphere (temperatures, composition, hazes, and the escape rate). Additional measurement objectives include topography, surface temperatures, and the solar wind interaction. The fulfillment of these measurement objectives will broaden our understanding of the Pluto system, such as the origin of the Pluto system, the processes operating on the surface, the volatile transport cycle, and the energetics and chemistry of the atmosphere. The mission, payload, and strawman observing sequences have been designed to acheive the NASA-specified measurement objectives and maximize the science return. The planned observations at the Pluto system will extend our knowledge of other objects formed by giant impact (such as the Earth-moon), other objects formed in the outer solar system (such as comets and other icy dwarf planets), other bodies with surfaces in vapor-pressure equilibrium (such as Triton and Mars), and other bodies with N2:CH4 atmospheres (such as Titan, Triton, and the early Earth).
astro-ph
the new horizons spacecraft will achieve a wide range of measurement objectives at the pluto system including color and panchromatic maps 125250 micron spectral images for studying surface compositions and measurements of plutos atmosphere temperatures composition hazes and the escape rate additional measurement objectives include topography surface temperatures and the solar wind interaction the fulfillment of these measurement objectives will broaden our understanding of the pluto system such as the origin of the pluto system the processes operating on the surface the volatile transport cycle and the energetics and chemistry of the atmosphere the mission payload and strawman observing sequences have been designed to acheive the nasaspecified measurement objectives and maximize the science return the planned observations at the pluto system will extend our knowledge of other objects formed by giant impact such as the earthmoon other objects formed in the outer solar system such as comets and other icy dwarf planets other bodies with surfaces in vaporpressure equilibrium such as triton and mars and other bodies with n2ch4 atmospheres such as titan triton and the early earth
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709.4271
A New 3D Potential-Density Basis Set
A set of bi-orthogonal potential-density basis functions is introduced to model the density and its associated gravitational field of three dimensional stellar systems. Radial components of our basis functions are weighted integral forms of spherical Bessel functions. We discuss the properties of our basis functions and demonstrate their shapes for the latitudinal Fourier number $l=2$.
astro-ph
a set of biorthogonal potentialdensity basis functions is introduced to model the density and its associated gravitational field of three dimensional stellar systems radial components of our basis functions are weighted integral forms of spherical bessel functions we discuss the properties of our basis functions and demonstrate their shapes for the latitudinal fourier number l2
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709.4272
Radio Detection of Supernova 2004ip in the Circumnuclear Region of the Luminous Infrared Galaxy IRAS 18293-3413
We report a radio detection of supernova SN 2004ip in the circumnuclear region of the luminous infrared galaxy IRAS 18293-3413, using Very Large Array (VLA) observations at 8.4 GHz on 11 June 2007. SN 2004ip had been previously discovered at near-infrared wavelengths using adaptive optics observations, but its nature (core-collapse or thermonuclear) could not be definitely established. Our radio detection, about three years after the explosion of the supernova, indicates a prominent interaction of the ejecta of SN 2004ip with the circumstellar medium, confirming that the supernova was a core-collapse event (probably Type II), and thus strongly suggesting that its progenitor was a massive star with a significant mass-loss prior to its explosion. SN 2004ip has a 8.4 GHz luminosity of 3.5E27 erg/s/Hz, about twice as bright as SN 2000ft in NGC 7469 at a similar age, and given its projected distance to the nucleus (~500 pc), is one of the closest of all known radio SNe to a galaxy nucleus, and one of the brightest radio SNe ever.
astro-ph
we report a radio detection of supernova sn 2004ip in the circumnuclear region of the luminous infrared galaxy iras 182933413 using very large array vla observations at 84 ghz on 11 june 2007 sn 2004ip had been previously discovered at nearinfrared wavelengths using adaptive optics observations but its nature corecollapse or thermonuclear could not be definitely established our radio detection about three years after the explosion of the supernova indicates a prominent interaction of the ejecta of sn 2004ip with the circumstellar medium confirming that the supernova was a corecollapse event probably type ii and thus strongly suggesting that its progenitor was a massive star with a significant massloss prior to its explosion sn 2004ip has a 84 ghz luminosity of 35e27 ergshz about twice as bright as sn 2000ft in ngc 7469 at a similar age and given its projected distance to the nucleus 500 pc is one of the closest of all known radio sne to a galaxy nucleus and one of the brightest radio sne ever
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709.4273
Set Matrices and The Path/Cycle Problem
Presentation of set matrices and demonstration of their efficiency as a tool using the path/cycle problem.
cs.DM cs.CC cs.DS math.CO
presentation of set matrices and demonstration of their efficiency as a tool using the pathcycle problem
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709.4274
Extreme gravitational lensing in vicinity of Schwarzschild-de Sitter black holes
We have developed a realistic, fully general relativistic computer code to simulate optical projection in a strong, spherically symmetric gravitational field. The standard theoretical analysis of optical projection for an observer in the vicinity of a Schwarzschild black hole is extended to black hole spacetimes with a repulsive cosmological constant, i.e, Schwarzschild-de Sitter spacetimes. Influence of the cosmological constant is investigated for static observers and observers radially free-falling from the static radius. Simulations include effects of the gravitational lensing, multiple images, Doppler and gravitational frequency shift, as well as the intensity amplification. The code generates images of the sky for the static observer and a movie simulations of the changing sky for the radially free-falling observer. Techniques of parallel programming are applied to get a high performance and a fast run of the BHC simulation code.
astro-ph
we have developed a realistic fully general relativistic computer code to simulate optical projection in a strong spherically symmetric gravitational field the standard theoretical analysis of optical projection for an observer in the vicinity of a schwarzschild black hole is extended to black hole spacetimes with a repulsive cosmological constant ie schwarzschildde sitter spacetimes influence of the cosmological constant is investigated for static observers and observers radially freefalling from the static radius simulations include effects of the gravitational lensing multiple images doppler and gravitational frequency shift as well as the intensity amplification the code generates images of the sky for the static observer and a movie simulations of the changing sky for the radially freefalling observer techniques of parallel programming are applied to get a high performance and a fast run of the bhc simulation code
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709.4275
Ullemar's formula for the moment map, II
We establish the complex analogue of Ullemar's formula for polynomial domains. We show that the Jacobian of the complex moment mapping is equal to the self-resultant of the defining polynomial.
math.CV math.AC
we establish the complex analogue of ullemars formula for polynomial domains we show that the jacobian of the complex moment mapping is equal to the selfresultant of the defining polynomial
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709.4276
The Integrability of Pauli System in Lorentz Violating Background
We systematically analyze the integrability of a Pauli system in Lorentz violating background at the non-relativistic level both in two- and three-dimensions. We consider the non-relativistic limit of the Dirac equation from the QED sector of the so-called Standard Model Extension by keeping only two types of background couplings, the vector a_mu and the axial vector b_mu. We show that the spin-orbit interaction comes as a higher order correction in the non-relativistic limit of the Dirac equation. Such an interaction allows the inclusion of spin degree non-trivially, and if Lorentz violating terms are allowed, they might be comparable under special circumstances. By including all possible first-order derivative terms and considering the cases a\ne 0, b\ne 0, and b_0\ne 0 one at a time, we determine the possible forms of constants of motion operator, and discuss the existence or continuity of integrability due to Lorentz violating background.
hep-th hep-ph
we systematically analyze the integrability of a pauli system in lorentz violating background at the nonrelativistic level both in two and threedimensions we consider the nonrelativistic limit of the dirac equation from the qed sector of the socalled standard model extension by keeping only two types of background couplings the vector a_mu and the axial vector b_mu we show that the spinorbit interaction comes as a higher order correction in the nonrelativistic limit of the dirac equation such an interaction allows the inclusion of spin degree nontrivially and if lorentz violating terms are allowed they might be comparable under special circumstances by including all possible firstorder derivative terms and considering the cases ane 0 bne 0 and b_0ne 0 one at a time we determine the possible forms of constants of motion operator and discuss the existence or continuity of integrability due to lorentz violating background
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709.4277
Geometric Transitions and Dynamical SUSY Breaking
We show that the physics of D-brane theories that exhibit dynamical SUSY breaking due to stringy instanton effects is well captured by geometric transitions, which recast the non-perturbative superpotential as a classical flux superpotential. This allows for simple engineering of Fayet, Polonyi, O'Raifeartaigh, and other canonical models of supersymmetry breaking in which an exponentially small scale of breaking can be understood either as coming from stringy instantons or as arising from the classical dynamics of fluxes.
hep-th
we show that the physics of dbrane theories that exhibit dynamical susy breaking due to stringy instanton effects is well captured by geometric transitions which recast the nonperturbative superpotential as a classical flux superpotential this allows for simple engineering of fayet polonyi oraifeartaigh and other canonical models of supersymmetry breaking in which an exponentially small scale of breaking can be understood either as coming from stringy instantons or as arising from the classical dynamics of fluxes
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709.4278
Long-Range Reconnaissance Imager on New Horizons
The LOng-Range Reconnaissance Imager (LORRI) is the high resolution imaging instrument for the New Horizons mission to Pluto, its giant satellite Charon, its small moons Nix and Hydra, and the Kuiper Belt, which is the vast region of icy bodies extending roughly from Neptune's orbit out to 50 astronomical units (AU). New Horizons launched on January 19, 2006 as the inaugural mission in NASA's New Frontiers program. LORRI is a narrow angle (field of view=0.29 deg), high resolution (4.95 microrad pixels), Ritchey-Chretien telescope with a 20.8 cm diameter primary mirror, a focal length of 263 cm, and a three lens field-flattening assembly. A 1024 x 1024 pixel (optically active region), thinned, backside-illuminated charge-coupled device (CCD) detector is used in the focal plane unit and is operated in frame transfer mode. LORRI provides panchromatic imaging over a bandpass that extends approximately from 350 nm to 850 nm. LORRI operates in an extreme thermal environment, situated inside the warm spacecraft with a large, open aperture viewing cold space. LORRI has a silicon carbide optical system, designed to maintain focus over the operating temperature range without a focus adjustment mechanism. Moreover, the spacecraft is thruster-stabilized without reaction wheels, placing stringent limits on the available exposure time and the optical throughput needed to satisfy the measurement requirements.
astro-ph
the longrange reconnaissance imager lorri is the high resolution imaging instrument for the new horizons mission to pluto its giant satellite charon its small moons nix and hydra and the kuiper belt which is the vast region of icy bodies extending roughly from neptunes orbit out to 50 astronomical units au new horizons launched on january 19 2006 as the inaugural mission in nasas new frontiers program lorri is a narrow angle field of view029 deg high resolution 495 microrad pixels ritcheychretien telescope with a 208 cm diameter primary mirror a focal length of 263 cm and a three lens fieldflattening assembly a 1024 x 1024 pixel optically active region thinned backsideilluminated chargecoupled device ccd detector is used in the focal plane unit and is operated in frame transfer mode lorri provides panchromatic imaging over a bandpass that extends approximately from 350 nm to 850 nm lorri operates in an extreme thermal environment situated inside the warm spacecraft with a large open aperture viewing cold space lorri has a silicon carbide optical system designed to maintain focus over the operating temperature range without a focus adjustment mechanism moreover the spacecraft is thrusterstabilized without reaction wheels placing stringent limits on the available exposure time and the optical throughput needed to satisfy the measurement requirements
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709.4279
ALICE: The Ultraviolet Imaging Spectrograph aboard the New Horizons Pluto-Kuiper Belt Mission
The New Horizons ALICE instrument is a lightweight (4.4 kg), low-power (4.4 Watt) imaging spectrograph aboard the New Horizons mission to Pluto/Charon and the Kuiper Belt. Its primary job is to determine the relative abundances of various species in Pluto's atmosphere. ALICE will also be used to search for an atmosphere around Pluto's moon, Charon, as well as the Kuiper Belt Objects (KBOs) that New Horizons hopes to fly by after Pluto-Charon, and it will make UV surface reflectivity measurements of all of these bodies as well. The instrument incorporates an off-axis telescope feeding a Rowland-circle spectrograph with a 520-1870 angstroms spectral passband, a spectral point spread function of 3-6 angstroms FWHM, and an instantaneous spatial field-of-view that is 6 degrees long. Different input apertures that feed the telescope allow for both airglow and solar occultation observations during the mission. The focal plane detector is an imaging microchannel plate (MCP) double delay-line detector with dual solar-blind opaque photocathodes (KBr and CsI) and a focal surface that matches the instrument's 15-cm diameter Rowland-circle. In what follows, we describe the instrument in greater detail, including descriptions of its ground calibration and initial in flight performance.
astro-ph
the new horizons alice instrument is a lightweight 44 kg lowpower 44 watt imaging spectrograph aboard the new horizons mission to plutocharon and the kuiper belt its primary job is to determine the relative abundances of various species in plutos atmosphere alice will also be used to search for an atmosphere around plutos moon charon as well as the kuiper belt objects kbos that new horizons hopes to fly by after plutocharon and it will make uv surface reflectivity measurements of all of these bodies as well the instrument incorporates an offaxis telescope feeding a rowlandcircle spectrograph with a 5201870 angstroms spectral passband a spectral point spread function of 36 angstroms fwhm and an instantaneous spatial fieldofview that is 6 degrees long different input apertures that feed the telescope allow for both airglow and solar occultation observations during the mission the focal plane detector is an imaging microchannel plate mcp double delayline detector with dual solarblind opaque photocathodes kbr and csi and a focal surface that matches the instruments 15cm diameter rowlandcircle in what follows we describe the instrument in greater detail including descriptions of its ground calibration and initial in flight performance
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709.428
A converse to Moore's theorem on cellular automata
We prove a converse to Moore's ``Garden-of-Eden'' theorem: a group G is amenable if and only if all cellular automata living on G that admit mutually erasable patterns also admit gardens of Eden. It had already been conjectured in that amenability could be characterized by cellular automata. We prove the first part of that conjecture.
math.CO cs.IT math.DS math.GR math.IT
we prove a converse to moores gardenofeden theorem a group g is amenable if and only if all cellular automata living on g that admit mutually erasable patterns also admit gardens of eden it had already been conjectured in that amenability could be characterized by cellular automata we prove the first part of that conjecture
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709.4281
Ralph: A Visible/Infrared Imager for the New Horizons Pluto/Kuiper Belt Mission
The New Horizons instrument named Ralph is a visible/near infrared multi-spectral imager and a short wavelength infrared spectral imager. It is one of the core instruments on New Horizons, NASA's first mission to the Pluto/Charon system and the Kuiper Belt. Ralph combines panchromatic and color imaging capabilities with IR imaging spectroscopy. Its primary purpose is to map the surface geology and composition of these objects, but it will also be used for atmospheric studies and to map the surface temperature. It is a compact, low-mass (10.5 kg), power efficient (7.1 W peak), and robust instrument with good sensitivity and excellent imaging characteristics. Other than a door opened once in flight, it has no moving parts. These characteristics and its high degree of redundancy make Ralph ideally suited to this long-duration flyby reconnaissance mission.
astro-ph
the new horizons instrument named ralph is a visiblenear infrared multispectral imager and a short wavelength infrared spectral imager it is one of the core instruments on new horizons nasas first mission to the plutocharon system and the kuiper belt ralph combines panchromatic and color imaging capabilities with ir imaging spectroscopy its primary purpose is to map the surface geology and composition of these objects but it will also be used for atmospheric studies and to map the surface temperature it is a compact lowmass 105 kg power efficient 71 w peak and robust instrument with good sensitivity and excellent imaging characteristics other than a door opened once in flight it has no moving parts these characteristics and its high degree of redundancy make ralph ideally suited to this longduration flyby reconnaissance mission
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709.4282
Glassy protein dynamics and gigantic solvent reorganization energy of plastocyanin
We report the results of Molecular Dynamics simulations of electron transfer activation parameters of plastocyanin metalloprotein involved as electron carrier in natural photosynthesis. We have discovered that slow, non-ergodic conformational fluctuations of the protein, coupled to hydrating water, result in a very broad distribution of donor-acceptor energy gaps far exceeding that observed for commonly studied inorganic and organic donor-acceptor complexes. The Stokes shift is not affected by these fluctuations and can be calculated from solvation models in terms of the response of the solvent dipolar polarization. The non-ergodic character of large-amplitude protein/water mobility breaks the strong link between the Stokes shift and reorganization energy characteristic of equilibrium (ergodic) theories of electron transfer. This mechanism might be responsible for low activation barriers in natural electron transfer proteins characterized by low reaction free energy.
physics.bio-ph physics.chem-ph
we report the results of molecular dynamics simulations of electron transfer activation parameters of plastocyanin metalloprotein involved as electron carrier in natural photosynthesis we have discovered that slow nonergodic conformational fluctuations of the protein coupled to hydrating water result in a very broad distribution of donoracceptor energy gaps far exceeding that observed for commonly studied inorganic and organic donoracceptor complexes the stokes shift is not affected by these fluctuations and can be calculated from solvation models in terms of the response of the solvent dipolar polarization the nonergodic character of largeamplitude proteinwater mobility breaks the strong link between the stokes shift and reorganization energy characteristic of equilibrium ergodic theories of electron transfer this mechanism might be responsible for low activation barriers in natural electron transfer proteins characterized by low reaction free energy
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709.4283
Production and detection of atomic hexadecapole at Earth's magnetic field
Anisotropy of atomic states is characterized by population differences and coherences between Zeeman sublevels. It can be efficiently created and probed via resonant interactions with light, the technique which is at the heart of modern atomic clocks and magnetometers. Recently, nonlinear magneto-optical techniques have been developed for selective production and detection of higher polarization moments, hexadecapole and hexacontatetrapole, in the ground states of the alkali atoms. Extension of these techniques into the range of geomagnetic fields is important for practical applications. This is because hexadecapole polarization corresponding to the $\Delta M=4$ Zeeman coherence, with maximum possible $\Delta M$ for electronic angular momentum $J=1/2$ and nuclear spin $I=3/2$, is insensitive to the nonlinear Zeeman effect (NLZ). This is of particular interest because NLZ normally leads to resonance splitting and systematic errors in atomic magnetometers. However, optical signals due to the hexadecapole moment decline sharply as a function of magnetic field. We report a novel method that allows selective creation of a macroscopic long-lived ground-state hexadecapole polarization. The immunity of the hexadecapole signal to NLZ is demonstrated with F=2 $^{87}$Rb atoms at Earth's field.
physics.atom-ph
anisotropy of atomic states is characterized by population differences and coherences between zeeman sublevels it can be efficiently created and probed via resonant interactions with light the technique which is at the heart of modern atomic clocks and magnetometers recently nonlinear magnetooptical techniques have been developed for selective production and detection of higher polarization moments hexadecapole and hexacontatetrapole in the ground states of the alkali atoms extension of these techniques into the range of geomagnetic fields is important for practical applications this is because hexadecapole polarization corresponding to the delta m4 zeeman coherence with maximum possible delta m for electronic angular momentum j12 and nuclear spin i32 is insensitive to the nonlinear zeeman effect nlz this is of particular interest because nlz normally leads to resonance splitting and systematic errors in atomic magnetometers however optical signals due to the hexadecapole moment decline sharply as a function of magnetic field we report a novel method that allows selective creation of a macroscopic longlived groundstate hexadecapole polarization the immunity of the hexadecapole signal to nlz is demonstrated with f2 87rb atoms at earths field
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709.4284
A squeezing formalism for finite dimensional quantum systems
This article presents a squeezing transformation for quantum systems associated to finite vector spaces. The physical idea of squeezing here is taken from the action of the usual squeezing operator over wave functions defined on a real line, that is, a transformation capable to diminish (or enhance) the mean square deviation of a centered distribution. As it is discussed, the definition of such an operator on finite dimensional vector spaces is not a trivial matter, but, on the other hand, has obvious connections with problems such as spin squeezing and (finite) quantum state reproduction.
quant-ph
this article presents a squeezing transformation for quantum systems associated to finite vector spaces the physical idea of squeezing here is taken from the action of the usual squeezing operator over wave functions defined on a real line that is a transformation capable to diminish or enhance the mean square deviation of a centered distribution as it is discussed the definition of such an operator on finite dimensional vector spaces is not a trivial matter but on the other hand has obvious connections with problems such as spin squeezing and finite quantum state reproduction
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709.4285
Weak convergence of Vervaat and Vervaat Error processes of long-range dependent sequences
Following Cs\"{o}rg\H{o}, Szyszkowicz and Wang (Ann. Statist. {\bf 34}, (2006), 1013--1044) we consider a long range dependent linear sequence. We prove weak convergence of the uniform Vervaat and the uniform Vervaat error processes, extending their results to distributions with unbounded support and removing normality assumption.
math.PR
following csorgho szyszkowicz and wang ann statist bf 34 2006 10131044 we consider a long range dependent linear sequence we prove weak convergence of the uniform vervaat and the uniform vervaat error processes extending their results to distributions with unbounded support and removing normality assumption
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709.4286
On the Radial Distribution of White Dwarfs in the Globular Cluster NGC 6397
We have examined the radial distribution of white dwarfs over a single HST/ACS field in the nearby globular cluster NGC 6397. In relaxed populations, such as in a globular cluster, stellar velocity dispersion, and hence radial distribution, is directly dependent on stellar masses. The progenitors of very young cluster white dwarfs had a mass of ~0.8 solar masses, while the white dwarfs themselves have a mass of ~0.5 solar masses. We thus expect young white dwarfs to have a concentrated radial distribution (like that of their progenitors) that becomes more extended over several relaxation times to mimic that of ~0.5 solar mass main-sequence stars. However, we observe young white dwarfs to have a significantly extended radial distribution compared to both the most massive main sequence stars in the cluster and also to old white dwarfs.
astro-ph
we have examined the radial distribution of white dwarfs over a single hstacs field in the nearby globular cluster ngc 6397 in relaxed populations such as in a globular cluster stellar velocity dispersion and hence radial distribution is directly dependent on stellar masses the progenitors of very young cluster white dwarfs had a mass of 08 solar masses while the white dwarfs themselves have a mass of 05 solar masses we thus expect young white dwarfs to have a concentrated radial distribution like that of their progenitors that becomes more extended over several relaxation times to mimic that of 05 solar mass mainsequence stars however we observe young white dwarfs to have a significantly extended radial distribution compared to both the most massive main sequence stars in the cluster and also to old white dwarfs
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709.4287
Magnetic Field Upper Limits for Jet Formation
Context: Very high magnetic fields at the surface of neutron stars or in the accretion disk of black holes inhibit the production of jets. Aims: We quantify here the magnetic field strength for jet formation. Methods: By using the Alfven Radius, R_A, we study what we call {\it the basic condition}, R_A/R_*=1 or R_A/R_{LSO}=1 (LSO, last stable orbit), in its dependency on the magnetic field strength and the mass accretion rate, and we analyse these results in 3-D and 2-D plots in the case of neutron star and black hole accretor systems, respectively. For this purpose, we did a systematic search of all available observational data for magnetic field strength and the mass accretion rate. Results: The association of a classical X-ray pulsar (i.e. B ~10^{12} G) with jets is excluded even if accreting at the Eddington critical rate. Z-sources may develop jets for B \simlt 10^{8.2} G, whereas Atoll-sources are potential sources of jets if B \simlt 10^{7.7} G. It is not ruled out that a millisecond X-ray pulsar could develop jets, at least for those sources where B \simlt 10^{7.5} G. In this case the millisecond X-ray pulsar could switch to a microquasar phase during its maximum accretion rate. For stellar-mass black hole X-ray binaries, the condition is that B \simlt 1.35 x 10^8 G and B \simlt 5 x 10^8 G at the last stable orbit for a Schwarzschild and a Kerr black hole, respectively. For active galactic nuclei (AGNs), it reaches B \simlt 10^{5.9} G for each kind of black hole. These theoretical results are in complete agreement with available observational data.
astro-ph
context very high magnetic fields at the surface of neutron stars or in the accretion disk of black holes inhibit the production of jets aims we quantify here the magnetic field strength for jet formation methods by using the alfven radius r_a we study what we call it the basic condition r_ar_1 or r_ar_lso1 lso last stable orbit in its dependency on the magnetic field strength and the mass accretion rate and we analyse these results in 3d and 2d plots in the case of neutron star and black hole accretor systems respectively for this purpose we did a systematic search of all available observational data for magnetic field strength and the mass accretion rate results the association of a classical xray pulsar ie b 1012 g with jets is excluded even if accreting at the eddington critical rate zsources may develop jets for b simlt 1082 g whereas atollsources are potential sources of jets if b simlt 1077 g it is not ruled out that a millisecond xray pulsar could develop jets at least for those sources where b simlt 1075 g in this case the millisecond xray pulsar could switch to a microquasar phase during its maximum accretion rate for stellarmass black hole xray binaries the condition is that b simlt 135 x 108 g and b simlt 5 x 108 g at the last stable orbit for a schwarzschild and a kerr black hole respectively for active galactic nuclei agns it reaches b simlt 1059 g for each kind of black hole these theoretical results are in complete agreement with available observational data
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709.4288
The New Horizons Spacecraft
The New Horizons spacecraft was launched on 19 January 2006. The spacecraft was designed to provide a platform for seven instruments that will collect and return data from Pluto in 2015. The design drew on heritage from previous missions developed at The Johns Hopkins University Applied Physics Laboratory (APL) and other missions such as Ulysses. The trajectory design imposed constraints on mass and structural strength to meet the high launch acceleration needed to reach the Pluto system prior to the year 2020. The spacecraft subsystems were designed to meet tight mass and power allocations, yet provide the necessary control and data handling finesse to support data collection and return when the one-way light time during the Pluto flyby is 4.5 hours. Missions to the outer solar system require a radioisotope thermoelectric generator (RTG) to supply electrical power, and a single RTG is used by New Horizons. To accommodate this constraint, the spacecraft electronics were designed to operate on less than 200 W. The spacecraft system architecture provides sufficient redundancy to provide a probability of mission success of greater than 0.85, even with a mission duration of over 10 years. The spacecraft is now on its way to Pluto, with an arrival date of 14 July 2015. Initial inflight tests have verified that the spacecraft will meet the design requirements.
astro-ph
the new horizons spacecraft was launched on 19 january 2006 the spacecraft was designed to provide a platform for seven instruments that will collect and return data from pluto in 2015 the design drew on heritage from previous missions developed at the johns hopkins university applied physics laboratory apl and other missions such as ulysses the trajectory design imposed constraints on mass and structural strength to meet the high launch acceleration needed to reach the pluto system prior to the year 2020 the spacecraft subsystems were designed to meet tight mass and power allocations yet provide the necessary control and data handling finesse to support data collection and return when the oneway light time during the pluto flyby is 45 hours missions to the outer solar system require a radioisotope thermoelectric generator rtg to supply electrical power and a single rtg is used by new horizons to accommodate this constraint the spacecraft electronics were designed to operate on less than 200 w the spacecraft system architecture provides sufficient redundancy to provide a probability of mission success of greater than 085 even with a mission duration of over 10 years the spacecraft is now on its way to pluto with an arrival date of 14 july 2015 initial inflight tests have verified that the spacecraft will meet the design requirements
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709.4289
Optical limiting using Laguerre-Gaussian beams
We demonstrate optical limiting using the self-lensing effect of a higher-order Laguerre-Gaussian beam in a thin dye-doped polymer sample, which we find is consistent with our model using Gaussian decomposition. The peak phase shift in the sample required for limiting is smaller than for a fundamental Gaussian beam with the added flexibility that the nonlinear medium can be placed either in front of or behind the beam focus.
physics.optics
we demonstrate optical limiting using the selflensing effect of a higherorder laguerregaussian beam in a thin dyedoped polymer sample which we find is consistent with our model using gaussian decomposition the peak phase shift in the sample required for limiting is smaller than for a fundamental gaussian beam with the added flexibility that the nonlinear medium can be placed either in front of or behind the beam focus
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709.429
HIP 56948: A Solar Twin With a Low Lithium Abundance
For more than a decade, 18 Sco (HD 146233) has been considered the star that most closely resembles the Sun, even though significant differences such as its Li content, which is about three times solar, exist. Using high resolution, high S/N spectra obtained at McDonald Observatory, we show that the stars HIP 56948 and HIP 73815 are very similar to the Sun in both stellar parameters and chemical composition, including a low Li abundance, which was previously thought to be peculiar in the Sun. HIP 56948, in particular, has stellar parameters identical to solar within the observational uncertainties, being thus the best solar twin known to date. HIP 56948 is also similar to the Sun in its lack of hot Jupiters. Considering the age of this star (1+/-1 Gyr older than the Sun) and its location and orbit around the Galaxy, if terrestrial planets exist around it, they may have had enough time to develop complex life, making it a prime target for SETI.
astro-ph
for more than a decade 18 sco hd 146233 has been considered the star that most closely resembles the sun even though significant differences such as its li content which is about three times solar exist using high resolution high sn spectra obtained at mcdonald observatory we show that the stars hip 56948 and hip 73815 are very similar to the sun in both stellar parameters and chemical composition including a low li abundance which was previously thought to be peculiar in the sun hip 56948 in particular has stellar parameters identical to solar within the observational uncertainties being thus the best solar twin known to date hip 56948 is also similar to the sun in its lack of hot jupiters considering the age of this star 11 gyr older than the sun and its location and orbit around the galaxy if terrestrial planets exist around it they may have had enough time to develop complex life making it a prime target for seti
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709.4291
Affine descents and the Steinberg torus
Let $W\ltimes L$ be an irreducible affine Weyl group with Coxeter complex $\Sigma$, where $W$ denotes the associated finite Weyl group and $L$ the translation subgroup. The Steinberg torus is the Boolean cell complex obtained by taking the quotient of $\Sigma$ by the lattice $L$. We show that the ordinary and flag $h$-polynomials of the Steinberg torus (with the empty face deleted) are generating functions over $W$ for a descent-like statistic first studied by Cellini. We also show that the ordinary $h$-polynomial has a nonnegative $\gamma$-vector, and hence, symmetric and unimodal coefficients. In the classical cases, we also provide expansions, identities, and generating functions for the $h$-polynomials of Steinberg tori.
math.CO math.GT
let wltimes l be an irreducible affine weyl group with coxeter complex sigma where w denotes the associated finite weyl group and l the translation subgroup the steinberg torus is the boolean cell complex obtained by taking the quotient of sigma by the lattice l we show that the ordinary and flag hpolynomials of the steinberg torus with the empty face deleted are generating functions over w for a descentlike statistic first studied by cellini we also show that the ordinary hpolynomial has a nonnegative gammavector and hence symmetric and unimodal coefficients in the classical cases we also provide expansions identities and generating functions for the hpolynomials of steinberg tori
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709.4292
Reduced State Uniquely Defines Groverian Measure of Original Pure State
Groverian and Geometric entanglement measures of the n-party pure state are expressed by the (n-1)-party reduced state density operator directly. This main theorem derives several important consequences. First, if two pure n-qudit states have reduced states of (n-1)-qudits, which are equivalent under local unitary(LU) transformations, then they have equal Groverian and Geometric entanglement measures. Second, both measures have an upper bound for pure states. However, this upper bound is reached only for two qubit systems. Third, it converts effectively the nonlinear eigenvalue problem for three qubit Groverian measure into linear eigenvalue equations. Some typical solutions of these linear equations are written explicitly and the features of the general solution are discussed in detail.
quant-ph
groverian and geometric entanglement measures of the nparty pure state are expressed by the n1party reduced state density operator directly this main theorem derives several important consequences first if two pure nqudit states have reduced states of n1qudits which are equivalent under local unitarylu transformations then they have equal groverian and geometric entanglement measures second both measures have an upper bound for pure states however this upper bound is reached only for two qubit systems third it converts effectively the nonlinear eigenvalue problem for three qubit groverian measure into linear eigenvalue equations some typical solutions of these linear equations are written explicitly and the features of the general solution are discussed in detail
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709.4293
Quark helicity flip and the transverse spin dependence of inclusive DIS
Inclusive DIS with unpolarized beam exhibits a subtle dependence on the transverse target spin, arising from the interference of one-photon and two-photon exchange amplitudes in the cross section. We argue that this observable probes mainly the quark helicity-flip amplitudes induced by the non-perturbative vacuum structure of QCD (spontaneous chiral symmetry breaking). This conjecture is based on (a) the absence of significant Sudakov suppression of the helicity-flip process if soft gluon emission in the quark subprocess is limited by the chiral symmetry-breaking scale mu_chiral^2 >> Lambda_QCD^2; (b) the expectation that the quark helicity-conserving twist-3 contribution is small. The normal target spin asymmetry is estimated to be of the order 10^{-4} in the kinematics of the planned Jefferson Lab Hall A experiment.
hep-ph
inclusive dis with unpolarized beam exhibits a subtle dependence on the transverse target spin arising from the interference of onephoton and twophoton exchange amplitudes in the cross section we argue that this observable probes mainly the quark helicityflip amplitudes induced by the nonperturbative vacuum structure of qcd spontaneous chiral symmetry breaking this conjecture is based on a the absence of significant sudakov suppression of the helicityflip process if soft gluon emission in the quark subprocess is limited by the chiral symmetrybreaking scale mu_chiral2 lambda_qcd2 b the expectation that the quark helicityconserving twist3 contribution is small the normal target spin asymmetry is estimated to be of the order 104 in the kinematics of the planned jefferson lab hall a experiment
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709.4294
New constraints on dark energy from the observed growth of the most X-ray luminous galaxy clusters
We present constraints on the mean matter density, Omega_m, the normalization of the density fluctuation power spectrum, sigma_8, and the dark-energy equation-of-state parameter, w, obtained from measurements of the X-ray luminosity function of the largest known galaxy clusters at redshifts z<0.7, as compiled in the Massive Cluster Survey (MACS) and the local BCS and REFLEX galaxy cluster samples. Our analysis employs an observed mass-luminosity relation, calibrated by hydrodynamical simulations, including corrections for non-thermal pressure support and accounting for the presence of intrinsic scatter. Conservative allowances for all known systematic uncertainties are included, as are standard priors on the Hubble constant and mean baryon density. We find Omega_m=0.28 +0.11 -0.07 and sigma_8=0.78 +0.11 -0.13 for a spatially flat, cosmological-constant model, and Omega_m=0.24 +0.15 -0.07, sigma_8=0.85 +0.13 -0.20 and w=-1.4 +0.4 -0.7 for a flat, constant-w model. Future work improving our understanding of redshift evolution and observational biases affecting the mass--X-ray luminosity relation have the potential to significantly tighten these constraints. Our results are consistent with those from recent analyses of type Ia supernovae, cosmic microwave background anisotropies, the X-ray gas mass fraction of relaxed galaxy clusters, baryon acoustic oscillations and cosmic shear. Combining the new X-ray luminosity function data with current supernova, cosmic microwave background and cluster gas fraction data yields the improved constraints Omega_m=0.269 +- 0.016, sigma_8=0.82 +- 0.03 and w=-1.02 +- 0.06. (Abridged)
astro-ph
we present constraints on the mean matter density omega_m the normalization of the density fluctuation power spectrum sigma_8 and the darkenergy equationofstate parameter w obtained from measurements of the xray luminosity function of the largest known galaxy clusters at redshifts z07 as compiled in the massive cluster survey macs and the local bcs and reflex galaxy cluster samples our analysis employs an observed massluminosity relation calibrated by hydrodynamical simulations including corrections for nonthermal pressure support and accounting for the presence of intrinsic scatter conservative allowances for all known systematic uncertainties are included as are standard priors on the hubble constant and mean baryon density we find omega_m028 011 007 and sigma_8078 011 013 for a spatially flat cosmologicalconstant model and omega_m024 015 007 sigma_8085 013 020 and w14 04 07 for a flat constantw model future work improving our understanding of redshift evolution and observational biases affecting the massxray luminosity relation have the potential to significantly tighten these constraints our results are consistent with those from recent analyses of type ia supernovae cosmic microwave background anisotropies the xray gas mass fraction of relaxed galaxy clusters baryon acoustic oscillations and cosmic shear combining the new xray luminosity function data with current supernova cosmic microwave background and cluster gas fraction data yields the improved constraints omega_m0269 0016 sigma_8082 003 and w102 006 abridged
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709.4295
NeIII/OII as an oxygen abundance indicator in the HII regions and HII galaxies
To calibrate the relationship between Ne3O2 (Ne3O2 = log(\neiii$\lambda3869$/\oii$\lambda3727$)) and oxygen abundances, we present a sample of $\sim$3000 $\hii$ galaxies from the Sloan Digital Sky Survey (SDSS) data release four. They are associated with a sample from the literature intended to enlarge the oxygen abundance region. We calculated the electron temperatures ($T_e$) of 210 galaxies in the SDSS sample with the direct method, and $T_e$ of the other 2960 galaxies in SDSS sample calculated with an empirical method. Then, we use a linear least-square fitting to calibrate the Ne3O2 oxygen abundance indicator. It is found that the Ne3O2 estimator follows a linear relation with \zoh\ that holds for the whole abundance range covered by the sample, from approximately 7.0 to 9.0. The best linear relationship between the Ne3O2 and the oxygen abundance is calibrated. The dispersion between oxygen abundance and Ne3O2 index in the metal rich galaxies may come partly from the moderate depletion of oxygen onto grains. The $Ne3O2$ method has the virtue of being single-valued and not affected by internal reddening. As a result, the $Ne3O2$ method can be a good metallicity indicator in the \hii regions and \hii galaxies, especially in high-redshift galaxies.
astro-ph
to calibrate the relationship between ne3o2 ne3o2 logneiiilambda3869oiilambda3727 and oxygen abundances we present a sample of sim3000 hii galaxies from the sloan digital sky survey sdss data release four they are associated with a sample from the literature intended to enlarge the oxygen abundance region we calculated the electron temperatures t_e of 210 galaxies in the sdss sample with the direct method and t_e of the other 2960 galaxies in sdss sample calculated with an empirical method then we use a linear leastsquare fitting to calibrate the ne3o2 oxygen abundance indicator it is found that the ne3o2 estimator follows a linear relation with zoh that holds for the whole abundance range covered by the sample from approximately 70 to 90 the best linear relationship between the ne3o2 and the oxygen abundance is calibrated the dispersion between oxygen abundance and ne3o2 index in the metal rich galaxies may come partly from the moderate depletion of oxygen onto grains the ne3o2 method has the virtue of being singlevalued and not affected by internal reddening as a result the ne3o2 method can be a good metallicity indicator in the hii regions and hii galaxies especially in highredshift galaxies
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709.4296
Chemical System Complexity and Bifurcation Point: a New Relationship
The article introduces a new relationship between the chemical system complexity and deviation of its bifurcation point from thermodynamic equilibrium. In the formalism of discrete thermodynamics of chemical equilibria, simulation of numerous equilibrium cases with regards to complexity of the reaction hosting systems has lead to a conclusion that the system deviation from thermodynamic equilibrium at the bifurcation point is directly proportional to logarithm of the system complexity parameter. With this relationship one can predict the efforts that are sufficient to destabilize the system thermodynamic branch and achieve the bifurcations area.
physics.chem-ph
the article introduces a new relationship between the chemical system complexity and deviation of its bifurcation point from thermodynamic equilibrium in the formalism of discrete thermodynamics of chemical equilibria simulation of numerous equilibrium cases with regards to complexity of the reaction hosting systems has lead to a conclusion that the system deviation from thermodynamic equilibrium at the bifurcation point is directly proportional to logarithm of the system complexity parameter with this relationship one can predict the efforts that are sufficient to destabilize the system thermodynamic branch and achieve the bifurcations area
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709.4297
Modulated Branching Processes, Origins of Power Laws and Queueing Duality
Power law distributions have been repeatedly observed in a wide variety of socioeconomic, biological and technological areas. In many of the observations, e.g., city populations and sizes of living organisms, the objects of interest evolve due to the replication of their many independent components, e.g., births-deaths of individuals and replications of cells. Furthermore, the rates of the replication are often controlled by exogenous parameters causing periods of expansion and contraction, e.g., baby booms and busts, economic booms and recessions, etc. In addition, the sizes of these objects often have reflective lower boundaries, e.g., cities do not fall bellow a certain size, low income individuals are subsidized by the government, companies are protected by bankruptcy laws, etc. Hence, it is natural to propose reflected modulated branching processes as generic models for many of the preceding observations. Indeed, our main results show that the proposed mathematical models result in power law distributions under quite general polynomial Gartner-Ellis conditions, the generality of which could explain the ubiquitous nature of power law distributions. In addition, on a logarithmic scale, we establish an asymptotic equivalence between the reflected branching processes and the corresponding multiplicative ones. The latter, as recognized by Goldie (1991), is known to be dual to queueing/additive processes. We emphasize this duality further in the generality of stationary and ergodic processes.
math.PR math.ST stat.TH
power law distributions have been repeatedly observed in a wide variety of socioeconomic biological and technological areas in many of the observations eg city populations and sizes of living organisms the objects of interest evolve due to the replication of their many independent components eg birthsdeaths of individuals and replications of cells furthermore the rates of the replication are often controlled by exogenous parameters causing periods of expansion and contraction eg baby booms and busts economic booms and recessions etc in addition the sizes of these objects often have reflective lower boundaries eg cities do not fall bellow a certain size low income individuals are subsidized by the government companies are protected by bankruptcy laws etc hence it is natural to propose reflected modulated branching processes as generic models for many of the preceding observations indeed our main results show that the proposed mathematical models result in power law distributions under quite general polynomial gartnerellis conditions the generality of which could explain the ubiquitous nature of power law distributions in addition on a logarithmic scale we establish an asymptotic equivalence between the reflected branching processes and the corresponding multiplicative ones the latter as recognized by goldie 1991 is known to be dual to queueingadditive processes we emphasize this duality further in the generality of stationary and ergodic processes
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709.4298
Observation of the Supernova Remnant IC 443 with VERITAS
Shell-type supernova remnants (SNRs) accelerate particles at the shock front between the expanding remnant and the swept-up interstellar medium. If these particles include protons and nuclei, very-high-energy gamma-ray emission may result from the decay of pions produced in interactions between cosmic rays and the local insterstellar medium. For SNRs that are interacting with a nearby molecular cloud, such as IC 443, the enhanced matter density provides a target medium that can amplify the gamma-ray emission. IC 443 also contains the pulsar wind nebula (PWN) CXOU J061705.3+222127. PWNe are the most plentiful galactic sources of very-high-energy gamma rays, which are produced in the shock formed at the collision of the pulsar wind with the ambient medium. VERITAS is an array of four 12-m telescopes dedicated to gamma-ray astronomy in the energy band above 100 GeV. Located on Mt. Hopkins in southern Arizona, VERITAS operated during the 2006-2007 season in 2-, 3-, and 4-telescope observation modes. In this talk, results from three-telescope observations of the composite supernova remnant IC 443 during the 2006-2007 season are discussed.
astro-ph
shelltype supernova remnants snrs accelerate particles at the shock front between the expanding remnant and the sweptup interstellar medium if these particles include protons and nuclei veryhighenergy gammaray emission may result from the decay of pions produced in interactions between cosmic rays and the local insterstellar medium for snrs that are interacting with a nearby molecular cloud such as ic 443 the enhanced matter density provides a target medium that can amplify the gammaray emission ic 443 also contains the pulsar wind nebula pwn cxou j0617053222127 pwne are the most plentiful galactic sources of veryhighenergy gamma rays which are produced in the shock formed at the collision of the pulsar wind with the ambient medium veritas is an array of four 12m telescopes dedicated to gammaray astronomy in the energy band above 100 gev located on mt hopkins in southern arizona veritas operated during the 20062007 season in 2 3 and 4telescope observation modes in this talk results from threetelescope observations of the composite supernova remnant ic 443 during the 20062007 season are discussed
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709.4299
TeV and X-ray Monitoring of LS I +61 303 With VERITAS, Swift, and RXTE
Between September 2006 and February 2007, the galactic binary LS I +61 303 was monitored in the TeV band with the VERITAS array of imaging Cherenkov telescopes. These observations confirm LS I +61 303 as a variable TeV gamma-ray source, with emission peaking between orbital phase 0.6 and 0.7. During this observational period, monitoring in the X-ray regime was also carried out using both the RXTE and Swift detectors, which offered complementary coverage of the source. Outbursts in the 0.2-10 keV band were observed by both satellites at close to the same orbital phase as the TeV peak during the 2 orbital cycles covered simultaneously in both bands. While this source has been extensively studied in the X-ray band in the past, this is the first observational campaign to utilize contemporaneous X-ray and TeV data on LS I +61 303.
astro-ph
between september 2006 and february 2007 the galactic binary ls i 61 303 was monitored in the tev band with the veritas array of imaging cherenkov telescopes these observations confirm ls i 61 303 as a variable tev gammaray source with emission peaking between orbital phase 06 and 07 during this observational period monitoring in the xray regime was also carried out using both the rxte and swift detectors which offered complementary coverage of the source outbursts in the 0210 kev band were observed by both satellites at close to the same orbital phase as the tev peak during the 2 orbital cycles covered simultaneously in both bands while this source has been extensively studied in the xray band in the past this is the first observational campaign to utilize contemporaneous xray and tev data on ls i 61 303
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709.43
Observations of the Crab Nebula with the Whipple 10 m Telescope
Due to the strong and steady TeV gamma-ray emission from the Crab Nebula supernova remnant, its measured flux and energy spectrum can be used to verify the calibration and data reduction methods applied to IACT data acquired over many observing seasons. This gives us confidence in the results obtained on variable TeV sources observed over the same period and in relating the sensitivity of new instruments to historical datasets. Here we present the results of an analysis of 65.3 hours of good quality data taken on the Crab Nebula between October 2000 and March 2006 with the Whipple 10m telescope. The total exposure resulted in a 46 sigma signal with 11886 selected excess events. The energy spectrum was best fit by a power law of the form dN/dE = (3.19 +/- 0.07_stat) x 10^-11 (E/TeV)^(-2.64 +/- 0.03_stat) cm^-2/s/TeV in the energy range 0.49--8 TeV. The systematic uncertainty in the flux was estimated to be 30%, with a systematic error of 0.2 in the photon index. A reasonable agreement is shown for a fit to a constant flux over the 6 years.
astro-ph
due to the strong and steady tev gammaray emission from the crab nebula supernova remnant its measured flux and energy spectrum can be used to verify the calibration and data reduction methods applied to iact data acquired over many observing seasons this gives us confidence in the results obtained on variable tev sources observed over the same period and in relating the sensitivity of new instruments to historical datasets here we present the results of an analysis of 653 hours of good quality data taken on the crab nebula between october 2000 and march 2006 with the whipple 10m telescope the total exposure resulted in a 46 sigma signal with 11886 selected excess events the energy spectrum was best fit by a power law of the form dnde 319 007_stat x 1011 etev264 003_stat cm2stev in the energy range 0498 tev the systematic uncertainty in the flux was estimated to be 30 with a systematic error of 02 in the photon index a reasonable agreement is shown for a fit to a constant flux over the 6 years
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709.4301
A bright millisecond radio burst of extragalactic origin
Pulsar surveys offer one of the few opportunities to monitor even a small fraction (~0.00001) of the radio sky for impulsive burst-like events with millisecond durations. In analysis of archival survey data, we have discovered a 30-Jy dispersed burst of duration <5 ms located three degrees from the Small Magellanic Cloud. The burst properties argue against a physical association with our Galaxy or the Small Magellanic Cloud. Current models for the free electron content in the Universe imply a distance to the burst of <1 Gpc No further bursts are seen in 90-hr of additional observations, implying that it was a singular event such as a supernova or coalescence of relativistic objects. Hundreds of similar events could occur every day and act as insightful cosmological probes.
astro-ph
pulsar surveys offer one of the few opportunities to monitor even a small fraction 000001 of the radio sky for impulsive burstlike events with millisecond durations in analysis of archival survey data we have discovered a 30jy dispersed burst of duration 5 ms located three degrees from the small magellanic cloud the burst properties argue against a physical association with our galaxy or the small magellanic cloud current models for the free electron content in the universe imply a distance to the burst of 1 gpc no further bursts are seen in 90hr of additional observations implying that it was a singular event such as a supernova or coalescence of relativistic objects hundreds of similar events could occur every day and act as insightful cosmological probes
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709.4302
Possibilities to verify the level density and radiative strength functions, extracted from the two-step gamma-cascade intensities
The direct determination of the excitation level density and radiative strength functions of their exciting gamma-transitions is impossible for the larger part of the stable and long-life radioactive target nuclei. This circumstance is uniquely determined by the fact, that the level spacing much less than the resolution of the existing spectrometers of gamma-rays and charged particles. The extraction of these parameters of nucleus in this situation can be executed by their only fitting to the most probable values, reproducing the measured in the nuclear reactions spectra and sections. This inverse problem of mathematical analysis of its nature is principally ambiguous. Moreover, system of equations, those connecting the number of excitable levels and probability of the emission of charge particles are assigned usually within the framework of some assumptions about the mechanism of nuclear reaction and factors, determining the dynamics of the studied process. The verification of these parameters can be partially executed by the calculation of total gamma-spectra for their different sets. As, in particular, the results of this analysis show, the calculation of the structure of the excited levels to a change in the form of the energy dependence of radiative strength functions most likely must be considered to the neutron-binding energy. It is not possible to exclude the possibility of that, that also radiative, and neutron strength functions depend on the structure of neutron resonance and for the higher excitation energies.
nucl-ex
the direct determination of the excitation level density and radiative strength functions of their exciting gammatransitions is impossible for the larger part of the stable and longlife radioactive target nuclei this circumstance is uniquely determined by the fact that the level spacing much less than the resolution of the existing spectrometers of gammarays and charged particles the extraction of these parameters of nucleus in this situation can be executed by their only fitting to the most probable values reproducing the measured in the nuclear reactions spectra and sections this inverse problem of mathematical analysis of its nature is principally ambiguous moreover system of equations those connecting the number of excitable levels and probability of the emission of charge particles are assigned usually within the framework of some assumptions about the mechanism of nuclear reaction and factors determining the dynamics of the studied process the verification of these parameters can be partially executed by the calculation of total gammaspectra for their different sets as in particular the results of this analysis show the calculation of the structure of the excited levels to a change in the form of the energy dependence of radiative strength functions most likely must be considered to the neutronbinding energy it is not possible to exclude the possibility of that that also radiative and neutron strength functions depend on the structure of neutron resonance and for the higher excitation energies
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709.4303
Security Analyses of One-time System
This paper has been withdrawn
cs.CR
this paper has been withdrawn
[['this', 'paper', 'has', 'been', 'withdrawn']]
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709.4304
On the correctness of various approaches in the extraction of the nucleus parameters on example of analysis of the two-step gamma-cascades in 163Dy compound nucleus
The model-free analysis of experimental data in the intensities of two-step cascades into 163Dy shows, that the basically special features of the cascade gamma-decay of its compound-state completely correspond to those observed in other nuclei. Thus, the density of the levels in this nucleus with good precision it is reproduced as sum of three, five, seven-quasiparticle excitations with the tenfold, as the minimum, by an increase due to vibration type excitations. The greatest changes in the sum of the radiation strength functions of dipole primary gamma-transitions correlate with a change in the number of excitable quasi-particles. Accordingly, model presentations about the radiation strength functions of larger, than for those existing, accuracy must consider as a quantity of excited quasi-particles, so the presence of the vibration type excitations of all possible types. Moreover, the reliable picture of the studied process can be obtained only from the approximation of the distributions of the intensities of cascades in the function of energies of their primary gamma-transitions.
nucl-ex
the modelfree analysis of experimental data in the intensities of twostep cascades into 163dy shows that the basically special features of the cascade gammadecay of its compoundstate completely correspond to those observed in other nuclei thus the density of the levels in this nucleus with good precision it is reproduced as sum of three five sevenquasiparticle excitations with the tenfold as the minimum by an increase due to vibration type excitations the greatest changes in the sum of the radiation strength functions of dipole primary gammatransitions correlate with a change in the number of excitable quasiparticles accordingly model presentations about the radiation strength functions of larger than for those existing accuracy must consider as a quantity of excited quasiparticles so the presence of the vibration type excitations of all possible types moreover the reliable picture of the studied process can be obtained only from the approximation of the distributions of the intensities of cascades in the function of energies of their primary gammatransitions
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709.4305
Measurements of the steady streaming flow around oscillating spheres using 3D particle tracking velocimetry
Granular particles vibrated in a fluid have been found to exhibit self-organization with attractive and repulsive interactions between the particles. These interactions have been attributed to the steady streaming flow around oscillating particles. Here we examine the steady streaming flow surrounding a vertically oscillating sphere using three dimensional particle tracking velocimetry. We present measurements of the flow with the sphere far from boundaries, close to the bottom wall of the tank, and near another oscillating sphere. The steady velocity field is found to disagree with available analytic calculations. When the sphere is oscillated near the bottom wall the entire topology of the flow changes, resulting in a larger repulsive region than expected. Previous experiments saw attraction between particles in the region where the flow around a single particle is repulsive. We conclude that advection in the streaming flow due to a single particle cannot explain the observed attractive and repulsive interactions, rather non-linear interactions between the flows around two or more spheres must be responsible.
cond-mat.soft
granular particles vibrated in a fluid have been found to exhibit selforganization with attractive and repulsive interactions between the particles these interactions have been attributed to the steady streaming flow around oscillating particles here we examine the steady streaming flow surrounding a vertically oscillating sphere using three dimensional particle tracking velocimetry we present measurements of the flow with the sphere far from boundaries close to the bottom wall of the tank and near another oscillating sphere the steady velocity field is found to disagree with available analytic calculations when the sphere is oscillated near the bottom wall the entire topology of the flow changes resulting in a larger repulsive region than expected previous experiments saw attraction between particles in the region where the flow around a single particle is repulsive we conclude that advection in the streaming flow due to a single particle cannot explain the observed attractive and repulsive interactions rather nonlinear interactions between the flows around two or more spheres must be responsible
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709.4306
Modulation of bilayer quantum Hall states by tilted-field-induced subband-Landau-level coupling
We study effects of tilted magnetic fields on energy levels in a double-quantum-well (DQW) system, focusing on the coupling of subbands and Landau levels (LLs). The subband-LL coupling induces anticrossings between LLs, manifested directly in the magnetoresistance. The anticrossing gap becomes larger than the spin splitting at the tilting angle $\theta \sim 20^\circ $ and larger than the cyclotron energy at $\theta \sim 50^\circ $, demonstrating that the subband-LL coupling exerts a strong influence on quantum Hall states even in at a relatively small $\theta $ and plays a dominant role for larger $\theta $. We also find that when the DQW potential is asymmetric, LL coupling occurs even within a subband. Calculations including higher-order coupling reproduce the experimental results quantitatively well.
cond-mat.mes-hall
we study effects of tilted magnetic fields on energy levels in a doublequantumwell dqw system focusing on the coupling of subbands and landau levels lls the subbandll coupling induces anticrossings between lls manifested directly in the magnetoresistance the anticrossing gap becomes larger than the spin splitting at the tilting angle theta sim 20circ and larger than the cyclotron energy at theta sim 50circ demonstrating that the subbandll coupling exerts a strong influence on quantum hall states even in at a relatively small theta and plays a dominant role for larger theta we also find that when the dqw potential is asymmetric ll coupling occurs even within a subband calculations including higherorder coupling reproduce the experimental results quantitatively well
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709.4307
The rapid decline of the prompt emission in Gamma-Ray Bursts
Many gamma ray bursts (GRBs) have been observed with the Burst-Alert and X-Ray telescopes of the Swift satellite. The successive `pulses' of these GRBs end with a fast decline and a fast spectral softening, until they are overtaken by another pulse, or the last pulse's decline is overtaken by a less rapidly-varying `afterglow'. The fast decline-phase has been attributed, in the currently-explored standard fireball model of GRBs, to `high-latitude' synchrotron emission from a collision of two conical shells. This high latitude emission does not explain the observed spectral softening. In contrast, the temporal behaviour and the spectral evolution during the fast-decline phase agree with the predictions of the cannonball model of GRBs.
astro-ph
many gamma ray bursts grbs have been observed with the burstalert and xray telescopes of the swift satellite the successive pulses of these grbs end with a fast decline and a fast spectral softening until they are overtaken by another pulse or the last pulses decline is overtaken by a less rapidlyvarying afterglow the fast declinephase has been attributed in the currentlyexplored standard fireball model of grbs to highlatitude synchrotron emission from a collision of two conical shells this high latitude emission does not explain the observed spectral softening in contrast the temporal behaviour and the spectral evolution during the fastdecline phase agree with the predictions of the cannonball model of grbs
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709.4308
The Globular Cluster System of M60 (NGC 4649). I. CFHT MOS Spectroscopy and Database
We present the measurement of radial velocities for globular clusters in M60, giant elliptical galaxy in the Virgo cluster. Target globular cluster candidates were selected using the Washington photometry based on the deep $16\arcmin \times 16\arcmin$ images taken at the KPNO 4m and using the $VI$ photometry derived from the HST/WFPC2 archive images. The spectra of the target objects were obtained using the Multi-Object Spectrograph (MOS) at the Canada-France-Hawaii Telescope (CFHT). We have measured the radial velocity for 111 objects in the field of M60: 93 globular clusters (72 blue globular clusters with $1.0\le(C-T_1)<1.7$ and 21 red globular clusters with $1.7\le(C-T_1)<2.4$), 11 foreground stars, 6 small galaxies, and the nucleus of M60. The measured velocities of the 93 globular clusters range from $\sim 500$ km s$^{-1}$ to $\sim 1600$ km s$^{-1}$, with a mean value of $1070_{-25}^{+27}$ km s$^{-1}$, which is in good agreement with the velocity of the nucleus of M60 ($v_{\rm gal}=1056$ km s$^{-1}$). Combining our results with data in the literature, we present a master catalog of radial velocities for 121 globular clusters in M60. The velocity dispersion of the globular clusters in the master catalog is found to be $234_{-14}^{+13}$ km s$^{-1}$ for the entire sample, $223_{-16}^{+13}$ km s$^{-1}$ for 83 blue globular clusters, and $258_{-31}^{+21}$ km s$^{-1}$ for 38 red globular clusters.
astro-ph
we present the measurement of radial velocities for globular clusters in m60 giant elliptical galaxy in the virgo cluster target globular cluster candidates were selected using the washington photometry based on the deep 16arcmin times 16arcmin images taken at the kpno 4m and using the vi photometry derived from the hstwfpc2 archive images the spectra of the target objects were obtained using the multiobject spectrograph mos at the canadafrancehawaii telescope cfht we have measured the radial velocity for 111 objects in the field of m60 93 globular clusters 72 blue globular clusters with 10lect_117 and 21 red globular clusters with 17lect_124 11 foreground stars 6 small galaxies and the nucleus of m60 the measured velocities of the 93 globular clusters range from sim 500 km s1 to sim 1600 km s1 with a mean value of 1070_2527 km s1 which is in good agreement with the velocity of the nucleus of m60 v_rm gal1056 km s1 combining our results with data in the literature we present a master catalog of radial velocities for 121 globular clusters in m60 the velocity dispersion of the globular clusters in the master catalog is found to be 234_1413 km s1 for the entire sample 223_1613 km s1 for 83 blue globular clusters and 258_3121 km s1 for 38 red globular clusters
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709.4309
The Globular Cluster System of M60 (NGC 4649). II. Kinematics of the Globular Cluster System
We present a kinematic analysis of the globular cluster (GC) system in the giant elliptical galaxy (gE) M60 in the Virgo cluster. Using the photometric and spectroscopic database of 121 GCs (83 blue GCs and 38 red GCs), we have investigated the kinematics of the GC system. We have found that the M60 GC system shows a significant overall rotation. The rotation amplitude of the blue GCs is slightly smaller than or similar to that of the red GCs, and their angles of rotation axes are similar. The velocity dispersions about the mean velocity and about the best fit rotation curve for the red GCs are marginally larger than those for the blue GCs. Comparison of observed stellar and GC velocity dispersion profiles with those calculated from the stellar mass profile shows that the mass-to-light ratio should be increased as the galactocentric distance increases, indicating the existence of an extended dark matter halo. The entire sample of GCs in M60 is found to have a tangentially biased velocity ellipsoid unlike the GC systems in other gEs. Two subsamples appear to have different velocity ellipsoids. The blue GC system has a modest tangentially biased velocity ellipsoid, while the red GC system has a modest radially biased or an isotropic velocity ellipsoid. From the comparison of the kinematic properties of the M60 GC system to those of other gEs (M87, M49, NGC 1399, NGC 5128, and NGC 4636), it is found that the velocity dispersion of the blue GC system is similar to or larger than that of the red GC system except for M60, and the rotation of the GC system is not negligible. The entire sample of each GC system shows an isotropic velocity ellipsoid except for M60, while the subsamples show diverse velocity ellipsoids. We discuss the implication of these results for the formation models of the GC system in gEs.
astro-ph
we present a kinematic analysis of the globular cluster gc system in the giant elliptical galaxy ge m60 in the virgo cluster using the photometric and spectroscopic database of 121 gcs 83 blue gcs and 38 red gcs we have investigated the kinematics of the gc system we have found that the m60 gc system shows a significant overall rotation the rotation amplitude of the blue gcs is slightly smaller than or similar to that of the red gcs and their angles of rotation axes are similar the velocity dispersions about the mean velocity and about the best fit rotation curve for the red gcs are marginally larger than those for the blue gcs comparison of observed stellar and gc velocity dispersion profiles with those calculated from the stellar mass profile shows that the masstolight ratio should be increased as the galactocentric distance increases indicating the existence of an extended dark matter halo the entire sample of gcs in m60 is found to have a tangentially biased velocity ellipsoid unlike the gc systems in other ges two subsamples appear to have different velocity ellipsoids the blue gc system has a modest tangentially biased velocity ellipsoid while the red gc system has a modest radially biased or an isotropic velocity ellipsoid from the comparison of the kinematic properties of the m60 gc system to those of other ges m87 m49 ngc 1399 ngc 5128 and ngc 4636 it is found that the velocity dispersion of the blue gc system is similar to or larger than that of the red gc system except for m60 and the rotation of the gc system is not negligible the entire sample of each gc system shows an isotropic velocity ellipsoid except for m60 while the subsamples show diverse velocity ellipsoids we discuss the implication of these results for the formation models of the gc system in ges
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709.431
Extensions and degenerations of spectral triples
For a unital C*-algebra A, which is equipped with a spectral triple and an extension T of A by the compacts, we construct a family of spectral triples associated to T and depending on the two positive parameters (s,t). Using Rieffel's notation of quantum Gromov-Hausdorff distance between compact quantum metric spaces it is possible to define a metric on this family of spectral triples, and we show that the distance between a pair of spectral triples varies continuously with respect to the parameters. It turns out that a spectral triple associated to the unitarization of the algebra of compact operators is obtained under the limit - in this metric - for (s,1) -> (0, 1), while the basic spectral triple, associated to A, is obtained from this family under a sort of a dual limiting process for (1, t) -> (1, 0). We show that our constructions will provide families of spectral triples for the unitarized compacts and for the Podles sphere. In the case of the compacts we investigate to which extent our proposed spectral triple satisfies Connes' 7 axioms for noncommutative geometry.
math.OA math-ph math.MP math.QA
for a unital calgebra a which is equipped with a spectral triple and an extension t of a by the compacts we construct a family of spectral triples associated to t and depending on the two positive parameters st using rieffels notation of quantum gromovhausdorff distance between compact quantum metric spaces it is possible to define a metric on this family of spectral triples and we show that the distance between a pair of spectral triples varies continuously with respect to the parameters it turns out that a spectral triple associated to the unitarization of the algebra of compact operators is obtained under the limit in this metric for s1 0 1 while the basic spectral triple associated to a is obtained from this family under a sort of a dual limiting process for 1 t 1 0 we show that our constructions will provide families of spectral triples for the unitarized compacts and for the podles sphere in the case of the compacts we investigate to which extent our proposed spectral triple satisfies connes 7 axioms for noncommutative geometry
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709.4311
Bounds for the second and the third derivatives of the electron density at the nucleus
Lower bound for ${\bar \rho}''(0)$, the second derivative of the spherically averaged atomic electronic density at the nucleus, and upper bound for ${\bar \rho}'''(0)$, the third derivative, are obtained respectively. It is shown that, for the ground state, ${\bar \rho}''(0) \ge {10/3} Z^2 \rho(0)$ and ${\bar \rho}'''(0) \le -{14/3}Z^3 \rho(0)$ where $Z$ is the charge of the nucleus, and $\rho(0)$ is the electron density at the nucleus. Tighter bounds for ${\bar \rho}''(0)$ and ${\bar \rho}'''(0)$ are also reported which are valid for both the ground state and excited states. Explicit illustration with the example of one-electron atomic ions is given.
physics.atom-ph physics.chem-ph
lower bound for bar rho0 the second derivative of the spherically averaged atomic electronic density at the nucleus and upper bound for bar rho0 the third derivative are obtained respectively it is shown that for the ground state bar rho0 ge 103 z2 rho0 and bar rho0 le 143z3 rho0 where z is the charge of the nucleus and rho0 is the electron density at the nucleus tighter bounds for bar rho0 and bar rho0 are also reported which are valid for both the ground state and excited states explicit illustration with the example of oneelectron atomic ions is given
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709.4312
Universality of quantum symplectic structure
Operating in the framework of `supmech' (a scheme of mechanics which aims at providing a concrete setting for the axiomatization of physics and probability theory as required in Hilbert's sixth problem; integrating noncommutative symplectic geometry and noncommutative probability in an algebraic setting, it associates, with every `experimentally accessible' system, a symplectic algebra and operates essentially as noncommutative Hamiltonian mechanics with some extra sophistication in the treatment of states) it is shown that interaction between systems can be consistently described only if either (i) all system algebras are commutative or (ii) all system algebras are noncommutative and have a quantum symplectic structure characterized by a UNIVERSAL Planck type real-valued constant of the dimension of action.
math.SG math-ph math.MP math.QA quant-ph
operating in the framework of supmech a scheme of mechanics which aims at providing a concrete setting for the axiomatization of physics and probability theory as required in hilberts sixth problem integrating noncommutative symplectic geometry and noncommutative probability in an algebraic setting it associates with every experimentally accessible system a symplectic algebra and operates essentially as noncommutative hamiltonian mechanics with some extra sophistication in the treatment of states it is shown that interaction between systems can be consistently described only if either i all system algebras are commutative or ii all system algebras are noncommutative and have a quantum symplectic structure characterized by a universal planck type realvalued constant of the dimension of action
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709.4313
Schwinger Mechanism and Hawking Radiation as Quantum Tunneling
The common interpretation of the Hawking radiation as quantum tunneling has some ambiguity such as coordinate-dependence of tunneling rate and non-invariance of the action under canonical transformations. It is shown that the tunneling process of black holes can be successfully described by Rindler coordinates in analogy with the Schwinger mechanism for pair production. We study the tunneling process of a charged black hole and a BTZ black hole.
hep-th
the common interpretation of the hawking radiation as quantum tunneling has some ambiguity such as coordinatedependence of tunneling rate and noninvariance of the action under canonical transformations it is shown that the tunneling process of black holes can be successfully described by rindler coordinates in analogy with the schwinger mechanism for pair production we study the tunneling process of a charged black hole and a btz black hole
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709.4314
Experimental demonstration of quantum leader election in linear optics
Linear optics is a promising candidate to enable the construction of quantum computers. A number of quantum protocols gates based on linear optics have been demonstrated. However, it is well-known that these gates are non-deterministic and that higher order nonlinearity is necessary for deterministic operations. We found the quantum leader election protocol (QLE) can be operated deterministically only with linear optics, and we have demonstrated the nearly deterministic operation which overcomes classical limit.
quant-ph
linear optics is a promising candidate to enable the construction of quantum computers a number of quantum protocols gates based on linear optics have been demonstrated however it is wellknown that these gates are nondeterministic and that higher order nonlinearity is necessary for deterministic operations we found the quantum leader election protocol qle can be operated deterministically only with linear optics and we have demonstrated the nearly deterministic operation which overcomes classical limit
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709.4315
Pulsar Magnetic Field Oscillation Model and Verification Methods
We constructed the magnetic field oscillation model (hereafter the MO model) by analogizing the periodically reversing phenomenon of the solar magnetic field to pulsars. Almost all kinds of pulsar radiation phenomena are best explained using the MO model, especially polarization characteristics, glitch, generation rate, the geodetic precession of pulsars and the configuration of pulsar-wind nebula of the Crab. The MO model also provides satisfactory explanation for other characteristics of pulsars, e.g., interpulse, spin-down, pulse nulling, beat and pulse drift, the loss rate of the rotating energy, and the accuracy of frequency. We present eight verification methods for the MO model. In addition to pulsars, our MO model can also be used to explain the pulse emission from non-compact stars such as the ultracool dwarf TVLM 513-46546 and the magnetic chemically peculiar star CU Virginis.
astro-ph
we constructed the magnetic field oscillation model hereafter the mo model by analogizing the periodically reversing phenomenon of the solar magnetic field to pulsars almost all kinds of pulsar radiation phenomena are best explained using the mo model especially polarization characteristics glitch generation rate the geodetic precession of pulsars and the configuration of pulsarwind nebula of the crab the mo model also provides satisfactory explanation for other characteristics of pulsars eg interpulse spindown pulse nulling beat and pulse drift the loss rate of the rotating energy and the accuracy of frequency we present eight verification methods for the mo model in addition to pulsars our mo model can also be used to explain the pulse emission from noncompact stars such as the ultracool dwarf tvlm 51346546 and the magnetic chemically peculiar star cu virginis
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709.4316
Confidence intervals for the normal mean utilizing prior information
Consider X_1,X_2,...,X_n that are independent and identically N(mu,sigma^2) distributed. Suppose that we have uncertain prior information that mu = 0. We answer the question: to what extent can a frequentist 1-alpha confidence interval for mu utilize this prior information?
math.ST stat.TH
consider x_1x_2x_n that are independent and identically nmusigma2 distributed suppose that we have uncertain prior information that mu 0 we answer the question to what extent can a frequentist 1alpha confidence interval for mu utilize this prior information
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709.4317
The connection between noise and quantum correlations in a double quantum dot
We investigate the current and noise characteristics of a double quantum dot system. The strong correlations induced by the Coulomb interaction create entangled two-electron states and lead to signatures in the transport properties. We show that the interaction parameter phi, which measures the admixture of the double-occupancy contribution to the singlet state and thus the degree of entanglement, can be directly accessed through the Fano factor of super-Poissonian shot noise.
cond-mat.mes-hall
we investigate the current and noise characteristics of a double quantum dot system the strong correlations induced by the coulomb interaction create entangled twoelectron states and lead to signatures in the transport properties we show that the interaction parameter phi which measures the admixture of the doubleoccupancy contribution to the singlet state and thus the degree of entanglement can be directly accessed through the fano factor of superpoissonian shot noise
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709.4318
Comparative study between N-body and Fokker-Planck simulations for rotating star clusters: I. Equal-mass system
We have carried out N-body simulations for rotating star clusters with equal mass and compared the results with Fokker-Planck models. These two different approaches are found to produce fairly similar results, although there are some differences with regard to the detailed aspects. We confirmed the acceleration of the core collapse of a cluster due to an initial non-zero angular momentum and found a similar evolutionary trend in the central density and velocity dispersion in both simulations. The degree of acceleration depends on the initial angular momentum. Angular momentum is being lost from the cluster due to the evaporation of stars with a large angular momentum on a relaxation time scale.
astro-ph
we have carried out nbody simulations for rotating star clusters with equal mass and compared the results with fokkerplanck models these two different approaches are found to produce fairly similar results although there are some differences with regard to the detailed aspects we confirmed the acceleration of the core collapse of a cluster due to an initial nonzero angular momentum and found a similar evolutionary trend in the central density and velocity dispersion in both simulations the degree of acceleration depends on the initial angular momentum angular momentum is being lost from the cluster due to the evaporation of stars with a large angular momentum on a relaxation time scale
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709.4319
Local density of diffeomorphisms with large centralizers
Given any compact manifold M, we construct a non-empty open subset O of the space of C^1-diffeomorphisms of M and a dense subset D of O such that the centralizer of every diffeomorphism in D is uncountable, hence non-trivial.
math.DS
given any compact manifold m we construct a nonempty open subset o of the space of c1diffeomorphisms of m and a dense subset d of o such that the centralizer of every diffeomorphism in d is uncountable hence nontrivial
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709.432
Experimental observation of the Anderson transition with atomic matter waves
We realize experimentally an atom-optics quantum chaotic system, the quasiperiodic kicked rotor, which is equivalent to a 3D disordered system, that allow us to demonstrate the Anderson metal-insulator transition. Sensitive measurements of the atomic wavefunction dynamics and the use of finite-size scaling techniques make it possible to extract both the critical parameters and the critical exponent of the transition, which is in good agreement with the value obtained in numerical simulations of the 3D Anderson model.
quant-ph cond-mat.mes-hall cond-mat.other cond-mat.stat-mech nlin.CD physics.optics
we realize experimentally an atomoptics quantum chaotic system the quasiperiodic kicked rotor which is equivalent to a 3d disordered system that allow us to demonstrate the anderson metalinsulator transition sensitive measurements of the atomic wavefunction dynamics and the use of finitesize scaling techniques make it possible to extract both the critical parameters and the critical exponent of the transition which is in good agreement with the value obtained in numerical simulations of the 3d anderson model
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709.4321
Chaotic scattering with direct processes: A generalization of Poisson's kernel for non-unitary scattering matrices
The problem of chaotic scattering in presence of direct processes or prompt responses is mapped via a transformation to the case of scattering in absence of such processes for non-unitary scattering matrices, \tilde S. In the absence of prompt responses, \tilde S is uniformly distributed according to its invariant measure in the space of \tilde S matrices with zero average, < \tilde S > =0. In the presence of direct processes, the distribution of \tilde S is non-uniform and it is characterized by the average < \tilde S > (\neq 0). In contrast to the case of unitary matrices S, where the invariant measures of S for chaotic scattering with and without direct processes are related through the well known Poisson kernel, here we show that for non-unitary scattering matrices the invariant measures are related by the Poisson kernel squared. Our results are relevant to situations where flux conservation is not satisfied. For example, transport experiments in chaotic systems, where gains or losses are present, like microwave chaotic cavities or graphs, and acoustic or elastic resonators.
cond-mat.mes-hall nlin.CD
the problem of chaotic scattering in presence of direct processes or prompt responses is mapped via a transformation to the case of scattering in absence of such processes for nonunitary scattering matrices tilde s in the absence of prompt responses tilde s is uniformly distributed according to its invariant measure in the space of tilde s matrices with zero average tilde s 0 in the presence of direct processes the distribution of tilde s is nonuniform and it is characterized by the average tilde s neq 0 in contrast to the case of unitary matrices s where the invariant measures of s for chaotic scattering with and without direct processes are related through the well known poisson kernel here we show that for nonunitary scattering matrices the invariant measures are related by the poisson kernel squared our results are relevant to situations where flux conservation is not satisfied for example transport experiments in chaotic systems where gains or losses are present like microwave chaotic cavities or graphs and acoustic or elastic resonators
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709.4322
Rich methane laminar flames doped with light unsaturated hydrocarbons. Part II: 1,3butadiene
In line with the study presented in the part I of this paper, the structure of a laminar rich premixed methane flame doped with 1,3-butadiene has been investigated. The flame contains 20.7% (molar) of methane, 31.4% of oxygen and 3.3% of 1,3-butadiene, corresponding to an equivalence ratio of 1.8, and a ratio C4H6 / CH4 of 16 %. The flame has been stabilized on a burner at a pressure of 6.7 kPa using argon as dilutant, with a gas velocity at the burner of 36 cm/s at 333 K. The temperature ranged from 600 K close to the burner up to 2150 K. Quantified species included usual methane C0-C2 combustion products and 1,3-butadiene, but also propyne, allene, propene, propane, 1,2-butadiene, butynes, vinylacetylene, diacetylene, 1,3-pentadiene, 2-methyl-1,3-butadiene (isoprene), 1-pentene, 3-methyl-1-butene, benzene and toluene. In order to model these new results, some improvements have been made to a mechanism previously developed in our laboratory for the reactions of C3-C4 unsaturated hydrocarbons. The main reaction pathways of consumption of 1,3-butadiene and of formation of C6 aromatic species have been derived from flow rate analyses. In this case, the C4 route to benzene formation plays an important role in comparison to the C3 pathway.
physics.chem-ph
in line with the study presented in the part i of this paper the structure of a laminar rich premixed methane flame doped with 13butadiene has been investigated the flame contains 207 molar of methane 314 of oxygen and 33 of 13butadiene corresponding to an equivalence ratio of 18 and a ratio c4h6 ch4 of 16 the flame has been stabilized on a burner at a pressure of 67 kpa using argon as dilutant with a gas velocity at the burner of 36 cms at 333 k the temperature ranged from 600 k close to the burner up to 2150 k quantified species included usual methane c0c2 combustion products and 13butadiene but also propyne allene propene propane 12butadiene butynes vinylacetylene diacetylene 13pentadiene 2methyl13butadiene isoprene 1pentene 3methyl1butene benzene and toluene in order to model these new results some improvements have been made to a mechanism previously developed in our laboratory for the reactions of c3c4 unsaturated hydrocarbons the main reaction pathways of consumption of 13butadiene and of formation of c6 aromatic species have been derived from flow rate analyses in this case the c4 route to benzene formation plays an important role in comparison to the c3 pathway
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709.4323
Markov basis for design of experiments with three-level factors
We consider Markov basis arising from fractional factorial designs with three-level factors. Once we have a Markov basis, $p$ values for various conditional tests are estimated by the Markov chain Monte Carlo procedure. For designed experiments with a single count observation for each run, we formulate a generalized linear model and consider a sample space with the same sufficient statistics to the observed data. Each model is characterized by a covariate matrix, which is constructed from the main and the interaction effects we intend to measure. We investigate fractional factorial designs with $3^{p-q}$ runs noting correspondences to the models for $3^{p-q}$ contingency tables.
stat.ME
we consider markov basis arising from fractional factorial designs with threelevel factors once we have a markov basis p values for various conditional tests are estimated by the markov chain monte carlo procedure for designed experiments with a single count observation for each run we formulate a generalized linear model and consider a sample space with the same sufficient statistics to the observed data each model is characterized by a covariate matrix which is constructed from the main and the interaction effects we intend to measure we investigate fractional factorial designs with 3pq runs noting correspondences to the models for 3pq contingency tables
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709.4324
Hard Squares for z = -1
The hard square model in statistical mechanics has been investigated for the case when the activity z is -1. For cyclic boundary conditions, the characteristic polynomial of the transfer matrix has an intriguingly simple structure, all the eigenvalues $x$ being zero, roots of unity, or solutions of x^3 = 4 cos^2 (pi*m/N). Here we tabulate the results for lattices of up to 12 columns with cyclic or free boundary conditions and the two obvious orientations. We remark that they are all unexpectedly simple and that for the rotated lattice with free or fixed boundary conditions there are obvious likely generalizations to any lattice size.
cond-mat.stat-mech
the hard square model in statistical mechanics has been investigated for the case when the activity z is 1 for cyclic boundary conditions the characteristic polynomial of the transfer matrix has an intriguingly simple structure all the eigenvalues x being zero roots of unity or solutions of x3 4 cos2 pimn here we tabulate the results for lattices of up to 12 columns with cyclic or free boundary conditions and the two obvious orientations we remark that they are all unexpectedly simple and that for the rotated lattice with free or fixed boundary conditions there are obvious likely generalizations to any lattice size
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709.4325
Crypto-Harmonic Oscillator in Higher Dimensions: Classical and Quantum Aspects
We study complexified Harmonic Oscillator models in two and three dimensions. Our work is a generalization of the work of Smilga \cite{sm} who initiated the study of these Crypto-gauge invariant models that can be related to $PT$-symmetric models. We show that rotational symmetry in higher spatial dimensions naturally introduces more constraints, (in contrast to \cite{sm} where one deals with a single constraint), with a much richer constraint structure. Some common as well as distinct features in the study of the same Crypto-oscillator in different dimensions are revealed. We also quantize the two dimensional Crypto-oscillator.
hep-th math-ph math.MP quant-ph
we study complexified harmonic oscillator models in two and three dimensions our work is a generalization of the work of smilga citesm who initiated the study of these cryptogauge invariant models that can be related to ptsymmetric models we show that rotational symmetry in higher spatial dimensions naturally introduces more constraints in contrast to citesm where one deals with a single constraint with a much richer constraint structure some common as well as distinct features in the study of the same cryptooscillator in different dimensions are revealed we also quantize the two dimensional cryptooscillator
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709.4326
Some properties of group-theoretical categories
We first show that every group-theoretical category is graded by a certain double coset ring. As a consequence, we obtain a necessary and sufficient condition for a group-theoretical category to be nilpotent. We then give an explicit description of the simple objects in a group-theoretical category (following Ostrik, arXiv:math/0202130) and of the group of invertible objects of a group-theoretical category, in group-theoretical terms. Finally, under certain restrictive conditions, we describe the universal grading group of a group-theoretical category.
math.QA math.CT
we first show that every grouptheoretical category is graded by a certain double coset ring as a consequence we obtain a necessary and sufficient condition for a grouptheoretical category to be nilpotent we then give an explicit description of the simple objects in a grouptheoretical category following ostrik arxivmath0202130 and of the group of invertible objects of a grouptheoretical category in grouptheoretical terms finally under certain restrictive conditions we describe the universal grading group of a grouptheoretical category
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709.4327
On and beyond entropy production: the case of Markov jump processes
How is it that entropy derivatives almost in their own are characterizing the state of a system close to equilibrium, and what happens further away from it? We explain within the framework of Markov jump processes why fluctuation theory can be based on considerations involving entropy production alone when perturbing around the detailed balance condition. Variational principles such as that of minimum entropy production are understood in that way. Yet, further away from equilibrium, dynamical fluctuations reveal a structure where the time-symmetric sector crucially enters. The fluctuations of densities and currents get coupled and a time-symmetric notion of dynamical activity becomes the counterpart and equal player to the entropy production. The results are summarized in an extended Onsager-Machlup Lagrangian, which in its quadratic approximation is expected to be quite general in governing the small fluctuations of nonequilibrium systems whose macroscopic behavior can be written in terms of a Master equation autonomously describing the time-dependence of densities and currents.
cond-mat.stat-mech
how is it that entropy derivatives almost in their own are characterizing the state of a system close to equilibrium and what happens further away from it we explain within the framework of markov jump processes why fluctuation theory can be based on considerations involving entropy production alone when perturbing around the detailed balance condition variational principles such as that of minimum entropy production are understood in that way yet further away from equilibrium dynamical fluctuations reveal a structure where the timesymmetric sector crucially enters the fluctuations of densities and currents get coupled and a timesymmetric notion of dynamical activity becomes the counterpart and equal player to the entropy production the results are summarized in an extended onsagermachlup lagrangian which in its quadratic approximation is expected to be quite general in governing the small fluctuations of nonequilibrium systems whose macroscopic behavior can be written in terms of a master equation autonomously describing the timedependence of densities and currents
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709.4328
Deeply Virtual Compton Scattering at JLab Hall A
The deeply virtual Compton scattering reaction has been investigated in the Hall A of the Jefferson Laboratory by measuring longitudinally polarized (e,e'gamma) cross sections, in the valence quark region, for protons and neutrons. In the proton channel, experimental results strongly support the factorization of the cross section at Q2 as low as 2 GeV2, opening the path to systematic measurements of generalized parton distributions (GPDs). In the neutron case, preliminary data show sensitivity to the angular momentum of quarks. http://indico.cern.ch/contributionDisplay.py?contribId=89&sessionId=12&confId=9499
nucl-ex
the deeply virtual compton scattering reaction has been investigated in the hall a of the jefferson laboratory by measuring longitudinally polarized eegamma cross sections in the valence quark region for protons and neutrons in the proton channel experimental results strongly support the factorization of the cross section at q2 as low as 2 gev2 opening the path to systematic measurements of generalized parton distributions gpds in the neutron case preliminary data show sensitivity to the angular momentum of quarks httpindicocernchcontributiondisplaypycontribid89sessionid12confid9499
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709.4329
Detecting unambiguously non-Abelian geometric phases with trapped ions
We propose for the first time an experimentally feasible scheme to disclose the noncommutative effects induced by a light-induced non-Abelian gauge structure with trapped ions. Under an appropriate configuration, a true non-Abelian gauge potential naturally arises in connection with the geometric phase associated with two degenerated dark states in a four-state atomic system interacting with three pulsed laser fields. We show that the population in atomic state at the end of a composed path formed by two closed loops $C_1$ and $C_2$ in the parameter space can be significantly different from the composed counter-ordered path. This population difference is directly induced by the noncommutative feature of non-Abelian geometric phases and can be detected unambiguously with current technology.
quant-ph
we propose for the first time an experimentally feasible scheme to disclose the noncommutative effects induced by a lightinduced nonabelian gauge structure with trapped ions under an appropriate configuration a true nonabelian gauge potential naturally arises in connection with the geometric phase associated with two degenerated dark states in a fourstate atomic system interacting with three pulsed laser fields we show that the population in atomic state at the end of a composed path formed by two closed loops c_1 and c_2 in the parameter space can be significantly different from the composed counterordered path this population difference is directly induced by the noncommutative feature of nonabelian geometric phases and can be detected unambiguously with current technology
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709.433
Magneto-gyrotropic photogalvanic effects in GaN/AlGaN two-dimensional systems
The magneto-gyrotropic photogalvanic and spin-galvanic effects are observed in (0001)-oriented GaN/AlGaN heterojunctions excited by terahertz radiation. We show that free-carrier absorption of linearly or circularly polarized terahertz radiation in low-dimensional structures causes an electric photocurrent in the presence of an in-plane magnetic field. Microscopic mechanisms of these photocurrents based on spin-related phenomena are discussed. Properties of the magneto-gyrotropic and spin-galvanic effects specific for hexagonal heterostructures are analyzed.
cond-mat.mes-hall
the magnetogyrotropic photogalvanic and spingalvanic effects are observed in 0001oriented ganalgan heterojunctions excited by terahertz radiation we show that freecarrier absorption of linearly or circularly polarized terahertz radiation in lowdimensional structures causes an electric photocurrent in the presence of an inplane magnetic field microscopic mechanisms of these photocurrents based on spinrelated phenomena are discussed properties of the magnetogyrotropic and spingalvanic effects specific for hexagonal heterostructures are analyzed
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709.4331
Spiral Galaxies in the SAURON Survey
We discuss some recent integral field spectroscopy using the SAURON instrument of a sample consisting of 24 early-type spirals, part of the SAURON Survey, and 18 late-type spirals. Using 2-dimensional maps of their stellar radial velocity, velocity dispersion, and absorption line strength, it is now much easier to understand the nature of nearby galactic bulges. We discuss a few highlights of this work, and point out some new ideas about the formation of galactic bulges.
astro-ph
we discuss some recent integral field spectroscopy using the sauron instrument of a sample consisting of 24 earlytype spirals part of the sauron survey and 18 latetype spirals using 2dimensional maps of their stellar radial velocity velocity dispersion and absorption line strength it is now much easier to understand the nature of nearby galactic bulges we discuss a few highlights of this work and point out some new ideas about the formation of galactic bulges
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709.4332
Sharp results in the integral-form John--Nirenberg inequality
We consider the strong form of the John-Nirenberg inequality for the $L^2$-based BMO. We construct explicit Bellman functions for the inequality in the continuous and dyadic settings and obtain the sharp constant as well as the precise bound on the inequality's range of validity, both previously unknown. The results for the two cases are substantially different. The paper not only gives another instance in the short list of such explicit calculations, but also presents the Bellman function method as a sequence of clear steps, adaptable to a wide variety of applications.
math.CA
we consider the strong form of the johnnirenberg inequality for the l2based bmo we construct explicit bellman functions for the inequality in the continuous and dyadic settings and obtain the sharp constant as well as the precise bound on the inequalitys range of validity both previously unknown the results for the two cases are substantially different the paper not only gives another instance in the short list of such explicit calculations but also presents the bellman function method as a sequence of clear steps adaptable to a wide variety of applications
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709.4333
BAT X-ray Survey - III: X-ray Spectra and Statistical Properties
In this concluding part of the series of three papers dedicated to the Swift/BAT hard X-ray survey (BXS), we focus on the X-ray spectral analysis and statistical properties of the source sample. Using a dedicated method to extract time-averaged spectra of BAT sources we show that Galactic sources have, generally, softer spectra than extragalactic objects and that Seyfert 2 galaxies are harder than Seyfert 1s. The averaged spectrum of all Seyfert galaxies is consistent with a power-law with photon index of 2.00 (+/-0.07). The cumulative flux-number relation for the extragalactic sources in the 14-170 keV band is best described by a power-law with a slope alpha=1.55 (+/-0.20) and a normalization of 9.6$\pm1.9 \times 10^{-3}$ AGN deg$^{-2}$ (or 396(+/-80) AGN all-sky) above a flux level of 2$\times 10^{-11}$erg cm$^{-2}$ s$^{-1}$ (~0.85 mCrab). The integration of the cumulative flux per unit area indicates that BAT resolves 1-2% of the X-ray background emission in the 14-170 keV band. A sub-sample of 24 extragalactic sources above the 4.5 sigma detection limit is used to study the statistical properties of AGN. This sample comprises local Seyfert galaxies (z=0.026, median value) and ~10% blazars. We find that 55% of the Seyfert galaxies are absorbed by column densities of Log(N_H)>22, but that none is a bona fide Compton-thick. This study shows the capabilities of BAT to probe the hard X-ray sky to the mCrab level.
astro-ph
in this concluding part of the series of three papers dedicated to the swiftbat hard xray survey bxs we focus on the xray spectral analysis and statistical properties of the source sample using a dedicated method to extract timeaveraged spectra of bat sources we show that galactic sources have generally softer spectra than extragalactic objects and that seyfert 2 galaxies are harder than seyfert 1s the averaged spectrum of all seyfert galaxies is consistent with a powerlaw with photon index of 200 007 the cumulative fluxnumber relation for the extragalactic sources in the 14170 kev band is best described by a powerlaw with a slope alpha155 020 and a normalization of 96pm19 times 103 agn deg2 or 39680 agn allsky above a flux level of 2times 1011erg cm2 s1 085 mcrab the integration of the cumulative flux per unit area indicates that bat resolves 12 of the xray background emission in the 14170 kev band a subsample of 24 extragalactic sources above the 45 sigma detection limit is used to study the statistical properties of agn this sample comprises local seyfert galaxies z0026 median value and 10 blazars we find that 55 of the seyfert galaxies are absorbed by column densities of logn_h22 but that none is a bona fide comptonthick this study shows the capabilities of bat to probe the hard xray sky to the mcrab level
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709.4334
Noncommutative Brownian motions with Kesten distributions and related Poisson processes
We introduce and study a noncommutative two-parameter family of noncommutative Brownian motions in the free Fock space. They are associated with Kesten laws and give a continuous interpolation between Brownian motions in free probability and monotone probability. The combinatorics of our model is based on ordered non-crossing partitions, in which to each such partition $P$ we assign a weight depending on the numbers of disorders and orders in $P$ related to the natural partial order on the set of blocks of $P$ implemented by the relation of being inner or outer. In particular, we obtain a simple relation between Delaney's numbers (related to inner blocks in non-crossing partitions) and generalized Euler's numbers (related to orders and disorders in ordered non-crossing partitions). An important feature of our interpolation is that the mixed moments of the corresponding creation and annihilation processes also reproduce their monotone and free counterparts, which does not take place in other interpolations. The same combinatorics is used to construct an interpolation between free and monotone Poisson processes.
math.QA math.PR
we introduce and study a noncommutative twoparameter family of noncommutative brownian motions in the free fock space they are associated with kesten laws and give a continuous interpolation between brownian motions in free probability and monotone probability the combinatorics of our model is based on ordered noncrossing partitions in which to each such partition p we assign a weight depending on the numbers of disorders and orders in p related to the natural partial order on the set of blocks of p implemented by the relation of being inner or outer in particular we obtain a simple relation between delaneys numbers related to inner blocks in noncrossing partitions and generalized eulers numbers related to orders and disorders in ordered noncrossing partitions an important feature of our interpolation is that the mixed moments of the corresponding creation and annihilation processes also reproduce their monotone and free counterparts which does not take place in other interpolations the same combinatorics is used to construct an interpolation between free and monotone poisson processes
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