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710.2353
A Criterion For Ergodicity of Non-uniformly hyperbolic Diffeomorphisms
In this work we exhibit a new criteria for ergodicity of diffeomorphisms involving conditions on Lyapunov exponents and general position of some invariant manifolds. On one hand we derive uniqueness of SRB-measures for transitive surface diffeomorphisms. On the other hand, using recent results on the existence of blenders we give a positive answer, in the $C^1$ topology, to a conjecture of Pugh-Shub in the context of partially hyperbolic conservative diffeomorphisms with two dimensional center bundle.
math.DS
in this work we exhibit a new criteria for ergodicity of diffeomorphisms involving conditions on lyapunov exponents and general position of some invariant manifolds on one hand we derive uniqueness of srbmeasures for transitive surface diffeomorphisms on the other hand using recent results on the existence of blenders we give a positive answer in the c1 topology to a conjecture of pughshub in the context of partially hyperbolic conservative diffeomorphisms with two dimensional center bundle
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710.2354
Deformed Quantum Cohomology and (0,2) Mirror Symmetry
We compute instanton corrections to correlators in the genus-zero topological subsector of a (0,2) supersymmetric gauged linear sigma model with target space P1xP1, whose left-moving fermions couple to a deformation of the tangent bundle. We then deduce the theory's chiral ring from these correlators, which reduces in the limit of zero deformation to the (2,2) ring. Finally, we compare our results with the computations carried out by Adams et al.[ABS04] and Katz and Sharpe[KS06]. We find immediate agreement with the latter and an interesting puzzle in completely matching the chiral ring of the former.
hep-th
we compute instanton corrections to correlators in the genuszero topological subsector of a 02 supersymmetric gauged linear sigma model with target space p1xp1 whose leftmoving fermions couple to a deformation of the tangent bundle we then deduce the theorys chiral ring from these correlators which reduces in the limit of zero deformation to the 22 ring finally we compare our results with the computations carried out by adams et alabs04 and katz and sharpeks06 we find immediate agreement with the latter and an interesting puzzle in completely matching the chiral ring of the former
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710.2355
Parametric internal waves in a compressible fluid
We describe the effect of vibration on a confined volume of fluid which is density stratified due to its compressibility. We show that internal gravity-acoustic waves can be parametrically destabilized by the vibration. The resulting instability is similar to the classic Faraday instability of surface waves, albeit modified by the compressible nature of the fluid. It may be possible to observe experimentally near a gas-liquid critical point.
physics.flu-dyn physics.gen-ph
we describe the effect of vibration on a confined volume of fluid which is density stratified due to its compressibility we show that internal gravityacoustic waves can be parametrically destabilized by the vibration the resulting instability is similar to the classic faraday instability of surface waves albeit modified by the compressible nature of the fluid it may be possible to observe experimentally near a gasliquid critical point
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710.2356
Patchy sticky hard spheres: analytical study and Monte Carlo simulations
We consider a fluid of hard spheres bearing one or two uniform circular adhesive patches, distributed so as not to overlap. Two spheres interact via a ``sticky'' Baxter potential if the line joining the centers of the two spheres intersects a patch on each sphere, and via a hard sphere potential otherwise. We analyze the location of the fluid-fluid transition and of the percolation line as a function of the size of the patch (the fractional coverage of the sphere's surface) and of the number of patches within a virial expansion up to third order and within the first two terms (C0 and C1) of a class of closures Cn hinging on a density expansion of the direct correlation function. We find that the locations of the two lines depend sensitively on both the total adhesive coverage and its distribution. The treatment is almost fully analytical within the chosen approximate theory. We test our findings by means of specialized Monte Carlo (MC) simulations and find the main qualitative features of the critical behaviour to be well captured in spite of the low density perturbative nature of the closure. The introduction of anisotropic attractions into a model suspension of spherical particles is a first step towards a more realistic description of globular proteins in solution.
cond-mat.stat-mech cond-mat.soft
we consider a fluid of hard spheres bearing one or two uniform circular adhesive patches distributed so as not to overlap two spheres interact via a sticky baxter potential if the line joining the centers of the two spheres intersects a patch on each sphere and via a hard sphere potential otherwise we analyze the location of the fluidfluid transition and of the percolation line as a function of the size of the patch the fractional coverage of the spheres surface and of the number of patches within a virial expansion up to third order and within the first two terms c0 and c1 of a class of closures cn hinging on a density expansion of the direct correlation function we find that the locations of the two lines depend sensitively on both the total adhesive coverage and its distribution the treatment is almost fully analytical within the chosen approximate theory we test our findings by means of specialized monte carlo mc simulations and find the main qualitative features of the critical behaviour to be well captured in spite of the low density perturbative nature of the closure the introduction of anisotropic attractions into a model suspension of spherical particles is a first step towards a more realistic description of globular proteins in solution
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710.2357
Overhang
How far off the edge of the table can we reach by stacking $n$ identical, homogeneous, frictionless blocks of length 1? A classical solution achieves an overhang of $1/2 H_n$, where $H_n ~ \ln n$ is the $n$th harmonic number. This solution is widely believed to be optimal. We show, however, that it is, in fact, exponentially far from optimality by constructing simple $n$-block stacks that achieve an overhang of $c n^{1/3}$, for some constant $c>0$.
math.HO math-ph math.CO math.MP
how far off the edge of the table can we reach by stacking n identical homogeneous frictionless blocks of length 1 a classical solution achieves an overhang of 12 h_n where h_n ln n is the nth harmonic number this solution is widely believed to be optimal we show however that it is in fact exponentially far from optimality by constructing simple nblock stacks that achieve an overhang of c n13 for some constant c0
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710.2358
Success and failure of programming environments - report on the design and use of a graphic abstract syntax tree editor
The STAPLE project investigated (at the end of the eighties), a persistent architecture for functional programming. Work has been done in two directions: the development of a programming environment for a functional language within a persistent system and an experiment on transferring the expertise of functional prototyping into industry. This paper is a report on the first activity. The first section gives a general description of Absynte - the abstract syntax tree editor developed within the Project. Following sections make an attempt at measuring the effectiveness of such an editor and discuss the problems raised by structured syntax editing - specially environments based on abstract syntax trees.
cs.PL cs.HC
the staple project investigated at the end of the eighties a persistent architecture for functional programming work has been done in two directions the development of a programming environment for a functional language within a persistent system and an experiment on transferring the expertise of functional prototyping into industry this paper is a report on the first activity the first section gives a general description of absynte the abstract syntax tree editor developed within the project following sections make an attempt at measuring the effectiveness of such an editor and discuss the problems raised by structured syntax editing specially environments based on abstract syntax trees
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710.2359
Stretching of the toroidal field and generation of magnetosonic waves in differentially rotating plasma
We evaluate the generation of magnetosonic waves in differentially rotating magnetized plasma. Differential rotation leads to an increase of the azimuthal field by winding up the poloidal field lines into the toroidal field lines. An amplification of weak seed perturbations is considered in this time-dependent background state. It is shown that seed perturbations can be amplified by several orders of magnitude in a differentially rotating flow. The only necessary condition for this amplification is the presence of a non-vanishing component of the magnetic field in the direction of the angular velocity gradient.
astro-ph
we evaluate the generation of magnetosonic waves in differentially rotating magnetized plasma differential rotation leads to an increase of the azimuthal field by winding up the poloidal field lines into the toroidal field lines an amplification of weak seed perturbations is considered in this timedependent background state it is shown that seed perturbations can be amplified by several orders of magnitude in a differentially rotating flow the only necessary condition for this amplification is the presence of a nonvanishing component of the magnetic field in the direction of the angular velocity gradient
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710.236
RH Sneutrino Condensate CDM and the Baryon-to-Dark Matter Ratio
The similarity of the observed mass densities of baryons and cold dark matter may be a sign they have a related origin. The baryon-to-dark matter ratio can be understood in the MSSM with right-handed (RH) neutrinos if CDM is due to a d = 4 flat direction condensate of very weakly coupled RH sneutrino LSPs and the baryon asymmetry is generated by Affleck-Dine leptogenesis along a d = 4 (H_{u}L)^2 flat direction. Observable signatures of the model include CDM and baryon isocurvature perturbations and distinctive long-lived NLSP phenomenology.
hep-ph astro-ph hep-th
the similarity of the observed mass densities of baryons and cold dark matter may be a sign they have a related origin the baryontodark matter ratio can be understood in the mssm with righthanded rh neutrinos if cdm is due to a d 4 flat direction condensate of very weakly coupled rh sneutrino lsps and the baryon asymmetry is generated by affleckdine leptogenesis along a d 4 h_ul2 flat direction observable signatures of the model include cdm and baryon isocurvature perturbations and distinctive longlived nlsp phenomenology
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710.2361
Response to Nauenberg's "Critique of Quantum Enigma: Physics Encounters Consciousness"
Nauenberg's extended critique of Quantum Enigma rests on fundamental misunderstandings.
quant-ph
nauenbergs extended critique of quantum enigma rests on fundamental misunderstandings
[['nauenbergs', 'extended', 'critique', 'of', 'quantum', 'enigma', 'rests', 'on', 'fundamental', 'misunderstandings']]
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710.2362
Application of multifractal wavelet analysis to spontaneous fermentation processes
An algorithm is presented here to get more detailed information, of mixed culture type, based exclusively on the biomass concentration data for fermentation processes. The analysis is performed with only the on-line measurements of the redox potential being available. It is a two-step procedure which includes an Artificial Neural Network (ANN) that relates the redox potential to the biomass concentrations in the first step. Next, a multifractal wavelet analysis is performed using the biomass estimates of the process. In this context, our results show that the redox potential is a valuable indicator of microorganism metabolic activity during the spontaneous fermentation. In this paper, the detailed design of the multifractal wavelet analysis is presented, as well as its direct experimental application at the laboratory level
physics.bio-ph
an algorithm is presented here to get more detailed information of mixed culture type based exclusively on the biomass concentration data for fermentation processes the analysis is performed with only the online measurements of the redox potential being available it is a twostep procedure which includes an artificial neural network ann that relates the redox potential to the biomass concentrations in the first step next a multifractal wavelet analysis is performed using the biomass estimates of the process in this context our results show that the redox potential is a valuable indicator of microorganism metabolic activity during the spontaneous fermentation in this paper the detailed design of the multifractal wavelet analysis is presented as well as its direct experimental application at the laboratory level
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710.2363
Global duality, signature calculus and the discrete logarithm problem
We study the discrete logarithm problem for the multiplicative group and for elliptic curves over a finite field by using a lifting of the corresponding object to an algebraic number field and global duality. We introduce the \textit{signature} of a Dirichlet character (in the multiplicative group case) or principal homogeneous space (in the elliptic curve case), which is a measure of the ramification at certain places. We then develop \textit{signature calculus}, which generalizes and refines the index calculus method. Finally, we show the random polynomial time equivalence for these two cases between the problem of computing signatures and the discrete logarithm problem.
math.NT
we study the discrete logarithm problem for the multiplicative group and for elliptic curves over a finite field by using a lifting of the corresponding object to an algebraic number field and global duality we introduce the textitsignature of a dirichlet character in the multiplicative group case or principal homogeneous space in the elliptic curve case which is a measure of the ramification at certain places we then develop textitsignature calculus which generalizes and refines the index calculus method finally we show the random polynomial time equivalence for these two cases between the problem of computing signatures and the discrete logarithm problem
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710.2364
A systematic approach to the solution of the constraints of quantum gravity: The full theory
This is the third paper in a series outlining an algorithm to construct finite states of quantum gravity in Ashtekar variables. In this paper we treat the case of the Klein--Gordon field quantized with gravity on the same footing. We address the full theory, outlining the solution to the constraints and the construction of the corresponding wavefunction of the universe. The basic method for the full theory is to expand the constraints relative to the solution for the pure Kodama state and rewrite them in the form of a generalized nonlinear group transformation of the CDJ matrix, viewed as a nine-dimensional vector. We then outline a prescription for finding the fixed point of the flow, and the corresponding generalized Kodama state for the full theory is constructed. The final solution is expressed in an asymptotic series in powers of model-specific matter inputs, suppressed by a small dimensionless constant, relative to the pure Kodama state. We discuss this expansion from different perspectives. Lastly, we explicitly show how the solution to the quantized constraints establishes a wavefunction of the universe with a predetermined semiclassical limit built in as a boundary condition on quantized gravity in the full theory.
gr-qc
this is the third paper in a series outlining an algorithm to construct finite states of quantum gravity in ashtekar variables in this paper we treat the case of the kleingordon field quantized with gravity on the same footing we address the full theory outlining the solution to the constraints and the construction of the corresponding wavefunction of the universe the basic method for the full theory is to expand the constraints relative to the solution for the pure kodama state and rewrite them in the form of a generalized nonlinear group transformation of the cdj matrix viewed as a ninedimensional vector we then outline a prescription for finding the fixed point of the flow and the corresponding generalized kodama state for the full theory is constructed the final solution is expressed in an asymptotic series in powers of modelspecific matter inputs suppressed by a small dimensionless constant relative to the pure kodama state we discuss this expansion from different perspectives lastly we explicitly show how the solution to the quantized constraints establishes a wavefunction of the universe with a predetermined semiclassical limit built in as a boundary condition on quantized gravity in the full theory
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710.2365
Detection of nuclear magnetic resonance with an anisotropic magnetoresistive sensor
We report detection of nuclear magnetic resonance (NMR) using an anisotropic magnetoresistive (AMR) sensor. A ``remote-detection'' arrangement was used, in which protons in flowing water were pre-polarized in the field of a superconducting NMR magnet, adiabatically inverted, and subsequently detected with an AMR sensor situated downstream from the magnet and the adiabatic inverter. AMR sensing is well suited for NMR detection in microfluidic ``lab-on-a-chip'' applications.
physics.chem-ph physics.atom-ph
we report detection of nuclear magnetic resonance nmr using an anisotropic magnetoresistive amr sensor a remotedetection arrangement was used in which protons in flowing water were prepolarized in the field of a superconducting nmr magnet adiabatically inverted and subsequently detected with an amr sensor situated downstream from the magnet and the adiabatic inverter amr sensing is well suited for nmr detection in microfluidic labonachip applications
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710.2366
New Worlds on the Horizon: Earth-Sized Planets Close to Other Stars
The search for habitable planets like Earth around other stars fulfils an ancient imperative to understand our origins and place in the cosmos. The past decade has seen the discovery of hundreds of planets, but nearly all are gas giants like Jupiter and Saturn. Recent advances in instrumentation and new missions are extending searches to planets the size of the Earth, but closer to their host stars. There are several possible ways such planets could form, and future observations will soon test those theories. Many of these planets we discover may be quite unlike Earth in their surface temperature and composition, but their study will nonetheless inform us about the process of planet formation and the frequency of Earth-like planets around other stars.
astro-ph
the search for habitable planets like earth around other stars fulfils an ancient imperative to understand our origins and place in the cosmos the past decade has seen the discovery of hundreds of planets but nearly all are gas giants like jupiter and saturn recent advances in instrumentation and new missions are extending searches to planets the size of the earth but closer to their host stars there are several possible ways such planets could form and future observations will soon test those theories many of these planets we discover may be quite unlike earth in their surface temperature and composition but their study will nonetheless inform us about the process of planet formation and the frequency of earthlike planets around other stars
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710.2367
Rubidium and lead abundances in giant stars of the globular clusters M4 and M5
We present measurements of the neutron-capture elements Rb and Pb for bright giants in the globular clusters M4 and M5. The clusters are of similar metallicity ([Fe/H] = -1.2) but M4 is decidedly s-process enriched relative to M5: [Ba/Fe] = +0.6 for M4 but 0.0 for M5. The Rb and Pb abundances were derived by comparing synthetic spectra with high-resolution, high signal-to-noise ratio spectra obtained with MIKE on the Magellan telescope. Abundances of Y, Zr, La, and Eu were also obtained. In M4, the mean abundances from 12 giants are [Rb/Fe] = 0.39 +/- 0.02 (sigma = 0.07), [Rb/Zr] = 0.17 +/- 0.03 (sigma = 0.08), and [Pb/Fe] = 0.30 +/- 0.02 (sigma = 0.07). In M5, the mean abundances from two giants are [Rb/Fe] = 0.00 +/- 0.05 (sigma = 0.06), [Rb/Zr] = 0.08 +/- 0.08 (sigma = 0.11), and [Pb/Fe] = -0.35 +/- 0.02 (sigma = 0.04). Within the measurement uncertainties, the abundance ratios [Rb/Fe], [Pb/Fe] and [Rb/X] for X = Y, Zr, La are constant from star-to-star in each cluster and none of these ratios are correlated with O or Na abundances. While M4 has a higher Rb abundance than M5, the ratios [Rb/X] are similar in both clusters indicating that the nature of the s-products are very similar for each cluster but the gas from which M4's stars formed had a higher concentration of these products.
astro-ph
we present measurements of the neutroncapture elements rb and pb for bright giants in the globular clusters m4 and m5 the clusters are of similar metallicity feh 12 but m4 is decidedly sprocess enriched relative to m5 bafe 06 for m4 but 00 for m5 the rb and pb abundances were derived by comparing synthetic spectra with highresolution high signaltonoise ratio spectra obtained with mike on the magellan telescope abundances of y zr la and eu were also obtained in m4 the mean abundances from 12 giants are rbfe 039 002 sigma 007 rbzr 017 003 sigma 008 and pbfe 030 002 sigma 007 in m5 the mean abundances from two giants are rbfe 000 005 sigma 006 rbzr 008 008 sigma 011 and pbfe 035 002 sigma 004 within the measurement uncertainties the abundance ratios rbfe pbfe and rbx for x y zr la are constant from startostar in each cluster and none of these ratios are correlated with o or na abundances while m4 has a higher rb abundance than m5 the ratios rbx are similar in both clusters indicating that the nature of the sproducts are very similar for each cluster but the gas from which m4s stars formed had a higher concentration of these products
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710.2368
Dynamical Mutation of Dark Energy
We discuss the intriguing possibility that dark energy may change its equation of state in situations where large dark energy fluctuations are present. We show indications of this dynamical mutation in some generic models of dark energy.
astro-ph hep-ph
we discuss the intriguing possibility that dark energy may change its equation of state in situations where large dark energy fluctuations are present we show indications of this dynamical mutation in some generic models of dark energy
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710.2369
Graphene-on-Sapphire and Graphene-on-Glass: Raman Spectroscopy Study
The room-temperature Raman signatures from graphene layers on sapphire and glass substrates were compared with those from graphene on GaAs substrate and on the standard Si/SiO2 substrate, which served as a reference. It was found that while G peak of graphene on Si/SiO2 and GaAs is positioned at 1580 cm-1 it is down-shifted by ~5 cm-1 for graphene-on-sapphire (GOS) and, in many cases, splits into doublets for graphene-on-glass (GOG) with the central frequency around 1580 cm-1. The obtained results are important for graphene characterization and its proposed graphene applications in electronic devices.
cond-mat.mtrl-sci
the roomtemperature raman signatures from graphene layers on sapphire and glass substrates were compared with those from graphene on gaas substrate and on the standard sisio2 substrate which served as a reference it was found that while g peak of graphene on sisio2 and gaas is positioned at 1580 cm1 it is downshifted by 5 cm1 for grapheneonsapphire gos and in many cases splits into doublets for grapheneonglass gog with the central frequency around 1580 cm1 the obtained results are important for graphene characterization and its proposed graphene applications in electronic devices
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710.237
Using a complete spectroscopic survey to find red quasars and test the KX method
We present an investigation of quasar colour-redshift parameter space in order to search for radio-quiet red quasars and to test the ability of a variant of the KX quasar selection method to detect quasars over a full range of colour without bias. This is achieved by combining IRIS2 imaging with the complete Fornax Cluster Spectroscopic Survey to probe parameter space unavailable to other surveys. We construct a new sample of 69 quasars with measured bJ - K colours. We show that the colour distribution of these quasars is significantly different from that of the Large Bright Quasar Survey's quasars at a 99.9% confidence level. We find 11 of our sample of 69 quasars have signifcantly red colours (bJ - K >= 3.5) and from this, we estimate the red quasar fraction of the K <= 18.4 quasar population to be 31%, and robustly constrain it to be at least 22%. We show that the KX method variant used here is more effective than the UVX selection method, and has less colour bias than optical colour-colour selection methods.
astro-ph
we present an investigation of quasar colourredshift parameter space in order to search for radioquiet red quasars and to test the ability of a variant of the kx quasar selection method to detect quasars over a full range of colour without bias this is achieved by combining iris2 imaging with the complete fornax cluster spectroscopic survey to probe parameter space unavailable to other surveys we construct a new sample of 69 quasars with measured bj k colours we show that the colour distribution of these quasars is significantly different from that of the large bright quasar surveys quasars at a 999 confidence level we find 11 of our sample of 69 quasars have signifcantly red colours bj k 35 and from this we estimate the red quasar fraction of the k 184 quasar population to be 31 and robustly constrain it to be at least 22 we show that the kx method variant used here is more effective than the uvx selection method and has less colour bias than optical colourcolour selection methods
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710.2371
Probing Non-Gaussianity In The Cosmic Microwave Background Anisotropies: One Point Distribution Function
We analyze WMAP 3 year data using the one-point distribution functions to probe the non-Gaussianity in the Cosmic Microwave Background (CMB) Anisotropy data. Computer simulations are performed to determine the uncertainties of the results. We report the non-Gaussianity parameter f_NL is constrained to 26<f_NL<82 for Q-band, 12<f_NL<67 for V-band, 7<f_NL<64 for W-band and 23<f_NL<75 for Q+V+W combined data at 95% confidence level (CL).
astro-ph hep-th
we analyze wmap 3 year data using the onepoint distribution functions to probe the nongaussianity in the cosmic microwave background cmb anisotropy data computer simulations are performed to determine the uncertainties of the results we report the nongaussianity parameter f_nl is constrained to 26f_nl82 for qband 12f_nl67 for vband 7f_nl64 for wband and 23f_nl75 for qvw combined data at 95 confidence level cl
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710.2372
Vista, results of a model-independent search for new physics in 927 pb^-1 at CDF
A global, model-independent search for high-pT exotic phenomena is presented using 927 pb^-1 of CDF II data. The search algorithms employed in this analysis are Vista and Sleuth. These proceedings focus on Vista, including a description of the method and a summary of results.
hep-ex hep-ph
a global modelindependent search for highpt exotic phenomena is presented using 927 pb1 of cdf ii data the search algorithms employed in this analysis are vista and sleuth these proceedings focus on vista including a description of the method and a summary of results
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710.2373
A Silicon-Tungsten ECal with Integrated Electronics
We summarize recent R&D progress for a silicon-tungsten electromagnetic calorimeter (ECal) with integrated electronics, designed to meet the ILC physics requirements.
physics.ins-det
we summarize recent rd progress for a silicontungsten electromagnetic calorimeter ecal with integrated electronics designed to meet the ilc physics requirements
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710.2374
Star cluster life-times: dependence on mass, radius and environment
The dissolution time (t_dis) of clusters in a tidal field does not scale with the ``classical'' expression for the relaxation time. First, the scaling with N, and hence cluster mass, is shallower due to the finite escape time of stars. Secondly, the cluster half-mass radius is of little importance. This is due to a balance between the relative tidal field strength and internal relaxation, which have an opposite effect on t_dis, but of similar magnitude. When external perturbations, such as encounters with giant molecular clouds (GMC) are important, t_dis for an individual cluster depends strongly on radius. The mean dissolution time for a population of clusters, however, scales in the same way with mass as for the tidal field, due to the weak dependence of radius on mass. The environmental parameters that determine t_dis are the tidal field strength and the density of molecular gas. We compare the empirically derived t_dis of clusters in six galaxies to theoretical predictions and argue that encounters with GMCs are the dominant destruction mechanism. Finally, we discuss a number of pitfalls in the derivations of t_dis from observations, such as incompleteness, with the cluster system of the SMC as particular example.
astro-ph
the dissolution time t_dis of clusters in a tidal field does not scale with the classical expression for the relaxation time first the scaling with n and hence cluster mass is shallower due to the finite escape time of stars secondly the cluster halfmass radius is of little importance this is due to a balance between the relative tidal field strength and internal relaxation which have an opposite effect on t_dis but of similar magnitude when external perturbations such as encounters with giant molecular clouds gmc are important t_dis for an individual cluster depends strongly on radius the mean dissolution time for a population of clusters however scales in the same way with mass as for the tidal field due to the weak dependence of radius on mass the environmental parameters that determine t_dis are the tidal field strength and the density of molecular gas we compare the empirically derived t_dis of clusters in six galaxies to theoretical predictions and argue that encounters with gmcs are the dominant destruction mechanism finally we discuss a number of pitfalls in the derivations of t_dis from observations such as incompleteness with the cluster system of the smc as particular example
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710.2375
Surgery, Yamabe invariant, and Seiberg-Witten theory
By using the gluing formula of the Seiberg-Witten invariant, we compute the Yamabe invariant Y(X) of 4-manifolds X obtained by performing surgeries along points, circles or tori on compact Kaehler surfaces. For instance, if M is a compact Kaehler surface of nonnegative Kodaira dimension, and N is a smooth closed oriented 4-manifold with b_2^+(N)=0 and Y(N)>= 0, then we show that Y(M # N)=Y(M).
math.DG
by using the gluing formula of the seibergwitten invariant we compute the yamabe invariant yx of 4manifolds x obtained by performing surgeries along points circles or tori on compact kaehler surfaces for instance if m is a compact kaehler surface of nonnegative kodaira dimension and n is a smooth closed oriented 4manifold with b_2n0 and yn 0 then we show that ym nym
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710.2376
Characteristic foliation on the discriminantal hypersurface of a holomorphic Lagrangian fibration
We give a Kodaira-type classification of general singular fibers of a holomorphic Lagrangian fibration in Fujiki's class $\mathcal C$. Our approach is based on the study of the characteristic vector field of the discriminantal hypersurface, which naturally arises from the defining equation of the hypersurface via the symplectic form. As an application, we show that the characteristic foliation of the discriminantal hypersurface has algebraic leaves which are either rational curves or smooth elliptic curves.
math.AG
we give a kodairatype classification of general singular fibers of a holomorphic lagrangian fibration in fujikis class mathcal c our approach is based on the study of the characteristic vector field of the discriminantal hypersurface which naturally arises from the defining equation of the hypersurface via the symplectic form as an application we show that the characteristic foliation of the discriminantal hypersurface has algebraic leaves which are either rational curves or smooth elliptic curves
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710.2377
Conversion Efficiencies of Heteronuclear Feshbach Molecules
We study the conversion efficiency of heteronuclear Feshbach molecules in population imbalanced atomic gases formed by ramping the magnetic field adiabatically. We extend the recent work [J. E. Williams et al., New J. Phys., 8, 150 (2006)] on the theory of Feshbach molecule formations to various combinations of quantum statistics of each atomic component. A simple calculation for a harmonically trapped ideal gas is in good agreement with the recent experiment [S. B. Papp and C. E. Wieman, Phys. Rev. Lett., 97, 180404 (2006)] without any fitting parameters. We also give the conversion efficiency as an explicit function of initial peak phase space density of the majority species for population imbalanced gases. In the low-density region where Bose-Einstein condensation does not appear, the conversion efficiency is a monotonic function of the initial peak phase space density, but independent of statistics of a minority component. The quantum statistics of majority atoms has a significant effect on the conversion efficiency. In addition, Bose-Einstein condensation of an atomic component is the key element determining the maximum conversion efficiency.
cond-mat.other
we study the conversion efficiency of heteronuclear feshbach molecules in population imbalanced atomic gases formed by ramping the magnetic field adiabatically we extend the recent work j e williams et al new j phys 8 150 2006 on the theory of feshbach molecule formations to various combinations of quantum statistics of each atomic component a simple calculation for a harmonically trapped ideal gas is in good agreement with the recent experiment s b papp and c e wieman phys rev lett 97 180404 2006 without any fitting parameters we also give the conversion efficiency as an explicit function of initial peak phase space density of the majority species for population imbalanced gases in the lowdensity region where boseeinstein condensation does not appear the conversion efficiency is a monotonic function of the initial peak phase space density but independent of statistics of a minority component the quantum statistics of majority atoms has a significant effect on the conversion efficiency in addition boseeinstein condensation of an atomic component is the key element determining the maximum conversion efficiency
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710.2378
Sleuth at CDF, a quasi-model-independent search for new electroweak scale physics
These proceedings describe Sleuth, a quasi-model-independent search strategy targeting new electroweak scale physics, and its application to 927 pb^-1 of CDF II data. Exclusive final states are analyzed for an excess of data beyond the Standard Model prediction at large summed scalar transverse momentum. This analysis of high-pT data represents one of the most encompassing searches so far conducted for new physics at the energy frontier.
hep-ex hep-ph
these proceedings describe sleuth a quasimodelindependent search strategy targeting new electroweak scale physics and its application to 927 pb1 of cdf ii data exclusive final states are analyzed for an excess of data beyond the standard model prediction at large summed scalar transverse momentum this analysis of highpt data represents one of the most encompassing searches so far conducted for new physics at the energy frontier
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710.2379
Connected sums with HP^n or CaP^2 and the Yamabe invariant
Let $M$ be a smooth closed $4k$-manifold whose Yamabe invariant $Y(M)$ is nonpositive. We show that $$Y(M\sharp l \Bbb HP^k\sharp m \bar{\Bbb HP^k})=Y(M),$$ where $l,m$ are nonnegative integers, and $\Bbb HP^k$ is the quaternionic projective space. When $k=4$, we also have $$Y(M\sharp l CaP^2\sharp m \bar{CaP^2})=Y(M),$$ where $CaP^2$ is the Cayley plane.
math.DG
let m be a smooth closed 4kmanifold whose yamabe invariant ym is nonpositive we show that ymsharp l bbb hpksharp m barbbb hpkym where lm are nonnegative integers and bbb hpk is the quaternionic projective space when k4 we also have ymsharp l cap2sharp m barcap2ym where cap2 is the cayley plane
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710.238
Aspects of QCD Vacuum Structure
The impact of dynamical fermions on the vacuum structure of QCD is explored. Of particular interest is the topological charge correlator, $<q(x) q(0) >$, where negative values at small $x$ reveal a sign-alternating layered structure to the topological-charge density of the QCD vacuum. We consider large $28^3 \times 96$ lattices from the MILC collaboration, and develop a new gluonic definition of the topological charge density, founded on a new over-improved stout-link smearing algorithm. The algorithm reproduces established results from the overlap formalism and is designed to preserve instantons. We examine the extent to which instanton-like objects are found on the lattice. Finally, we investigate the effects of dynamical sea-quark degrees of freedom on topology and find that the magnitudes of the negative dip in the $<q(x)q(0)>$ correlator and the positive $<q(0)^2>$ contact term are both increased with the introduction of dynamical fermion degrees of freedom. This is in accord with expectations based on charge renormalization and the vanishing of the topological susceptibility in the chiral limit.
hep-lat
the impact of dynamical fermions on the vacuum structure of qcd is explored of particular interest is the topological charge correlator qx q0 where negative values at small x reveal a signalternating layered structure to the topologicalcharge density of the qcd vacuum we consider large 283 times 96 lattices from the milc collaboration and develop a new gluonic definition of the topological charge density founded on a new overimproved stoutlink smearing algorithm the algorithm reproduces established results from the overlap formalism and is designed to preserve instantons we examine the extent to which instantonlike objects are found on the lattice finally we investigate the effects of dynamical seaquark degrees of freedom on topology and find that the magnitudes of the negative dip in the qxq0 correlator and the positive q02 contact term are both increased with the introduction of dynamical fermion degrees of freedom this is in accord with expectations based on charge renormalization and the vanishing of the topological susceptibility in the chiral limit
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710.2381
Magnetism and effect of anisotropy with one dimensional monatomic chain of cobalt by a Monte Carlo simulation
The magnetic properties of the one dimensional (1D) monatomic chain of Co reported in a previous experimental work are investigated by a classical Monte Carlo simulation based on the anisotropic Heisenberg model. In our simulation, the effect of the on-site uniaxial anisotropy, Ku, on each individual Co atom and the nearest neighbour exchange interaction, J, are accounted for. The normalized coercivity HC(T)/HC(TCL) is found to show a universal behaviour, HC(T)/HC(TCL) = h0(e^{TB/T}-e) in the temperature interval, TCL < T < TBCal, arising from the thermal activation effect. In the above expression, h0 is a constant, TBCal is the blocking temperature determined by the calculation, and TCL is the temperature above which the classical Monte Carlo simulation gives a good description on the investigated system. The present simulation has reproduced the experimental features, including the temperature dependent coercivity, HC(T), and the angular dependence of the remanent magnetization, MR(phi,theta), upon the relative orientation (phi,theta) of the applied field H. In addition, the calculation reveals that the ferromagnetic-like open hysteresis loop is a result of a slow dynamical process at T < TBCal. The dependence of the dynamical TBCal on the field sweeping rate R, the on-site anisotropy constant Ku, and the number of atoms in the atomic chain, N, has been investigated in detail.
cond-mat.stat-mech cond-mat.mtrl-sci
the magnetic properties of the one dimensional 1d monatomic chain of co reported in a previous experimental work are investigated by a classical monte carlo simulation based on the anisotropic heisenberg model in our simulation the effect of the onsite uniaxial anisotropy ku on each individual co atom and the nearest neighbour exchange interaction j are accounted for the normalized coercivity hcthctcl is found to show a universal behaviour hcthctcl h0etbte in the temperature interval tcl t tbcal arising from the thermal activation effect in the above expression h0 is a constant tbcal is the blocking temperature determined by the calculation and tcl is the temperature above which the classical monte carlo simulation gives a good description on the investigated system the present simulation has reproduced the experimental features including the temperature dependent coercivity hct and the angular dependence of the remanent magnetization mrphitheta upon the relative orientation phitheta of the applied field h in addition the calculation reveals that the ferromagneticlike open hysteresis loop is a result of a slow dynamical process at t tbcal the dependence of the dynamical tbcal on the field sweeping rate r the onsite anisotropy constant ku and the number of atoms in the atomic chain n has been investigated in detail
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710.2382
Flux Line Lattice Melting and the Formation of a Coherent Quasiparticle Bloch State in the Ultraclean URu$_2$Si$_2$ Superconductor
We find that in ultraclean heavy-fermion superconductor URu$_2$Si$_2$ ($T_{c0}=1.45$ K) a distinct flux line lattice melting transition with outstanding characters occurs well below the mean-field upper critical fields. We show that a very small number of carriers with heavy mass in this system results in exceptionally large thermal fluctuations even at subkelvin temperatures, which are witnessed by a sizable region of the flux line liquid phase. The uniqueness is further highlighted by an enhancement of the quasiparticle mean free path below the melting transition, implying a possible formation of a quasiparticle Bloch state in the periodic flux line lattice.
cond-mat.supr-con cond-mat.str-el
we find that in ultraclean heavyfermion superconductor uru_2si_2 t_c0145 k a distinct flux line lattice melting transition with outstanding characters occurs well below the meanfield upper critical fields we show that a very small number of carriers with heavy mass in this system results in exceptionally large thermal fluctuations even at subkelvin temperatures which are witnessed by a sizable region of the flux line liquid phase the uniqueness is further highlighted by an enhancement of the quasiparticle mean free path below the melting transition implying a possible formation of a quasiparticle bloch state in the periodic flux line lattice
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710.2383
Direct Amplification of Sound By Light
A new device, the opto-acoustic parametric amplifier (OAPA), is introduced, which is analogous to an optical parametric amplifier (OPA). The radiation pressure reaction of light on the reflective surface of an acoustic resonator provides nonlinearity similar to the Kerr effect in the OPA. The OAPA can be tuned to operate in two regimes. In the positive gain regime, an acoustic signal is directly amplified. In the negative gain regime, we show that the acoustic resonator can be cooled to the quantum ground state.
gr-qc
a new device the optoacoustic parametric amplifier oapa is introduced which is analogous to an optical parametric amplifier opa the radiation pressure reaction of light on the reflective surface of an acoustic resonator provides nonlinearity similar to the kerr effect in the opa the oapa can be tuned to operate in two regimes in the positive gain regime an acoustic signal is directly amplified in the negative gain regime we show that the acoustic resonator can be cooled to the quantum ground state
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710.2384
Long-time limit for a class of quadratic infinite-dimensional dynamical systems inspired by models of viscoelastic fluids
We study a class of quadratic, infinite-dimensional dynamical systems, inspired by models for viscoelastic fluids. We prove that these equations define a semi-flow on the cone of positive, essentially bounded functions. As time tends to infinity, the solutions tend to an equilibrium manifold in the $L^2$-norm. Convergence to a particular function on the equilibrium manifold is only proved under additional assumptions. We discuss several possible generalizations.
math.DS math.AP
we study a class of quadratic infinitedimensional dynamical systems inspired by models for viscoelastic fluids we prove that these equations define a semiflow on the cone of positive essentially bounded functions as time tends to infinity the solutions tend to an equilibrium manifold in the l2norm convergence to a particular function on the equilibrium manifold is only proved under additional assumptions we discuss several possible generalizations
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710.2385
Effect of initial condition of inflation on power and angular power spectra in finite slow-roll inflation
The effect of the initial condition of inflation on the power spectra of scalar and tensor perturbations is estimated assuming a slow-roll inflation model. By defining a more general initial state in inflation particular properties of the power spectrum such as oscillation can be revealed. The behavior of the power spectrum is shown to exhibit a step-like variation with respect to finite inflation length in cases of both radiation- and scalar matter-dominated pre-inflation. The power spectrum is shown to oscillate in the radiation-dominated case. The effects of such a power spectrum on the TT and TE power spectra are examined for three typical slow-roll inflation models; a small-field model, a large field model, and a hybrid model, considering both pre-inflation models. It is found that the discrepancies between WMAP3 data and the Lambda CDM model, such as suppression of the spectrum at l=2, may be explained to a certain extent by the finite length of inflation for inflation of close to 60 e-folds. The small-field inflation model with scalar matter-dominated pre-inflation provides the best fit to the WMAP3 data among the models considered. Relatively large changes in the angular TT power spectrum occur in response to small changes in inflation length in the radiation-dominated pre-inflation models, and half cases do not fit well with the observed data. This behavior is considered to be attributable to the oscillatory behavior of the power spectrum. The scalar matter-dominated case is thus preferred to the radiation-dominated case of pre-inflation, independent of the length of inflation.
astro-ph
the effect of the initial condition of inflation on the power spectra of scalar and tensor perturbations is estimated assuming a slowroll inflation model by defining a more general initial state in inflation particular properties of the power spectrum such as oscillation can be revealed the behavior of the power spectrum is shown to exhibit a steplike variation with respect to finite inflation length in cases of both radiation and scalar matterdominated preinflation the power spectrum is shown to oscillate in the radiationdominated case the effects of such a power spectrum on the tt and te power spectra are examined for three typical slowroll inflation models a smallfield model a large field model and a hybrid model considering both preinflation models it is found that the discrepancies between wmap3 data and the lambda cdm model such as suppression of the spectrum at l2 may be explained to a certain extent by the finite length of inflation for inflation of close to 60 efolds the smallfield inflation model with scalar matterdominated preinflation provides the best fit to the wmap3 data among the models considered relatively large changes in the angular tt power spectrum occur in response to small changes in inflation length in the radiationdominated preinflation models and half cases do not fit well with the observed data this behavior is considered to be attributable to the oscillatory behavior of the power spectrum the scalar matterdominated case is thus preferred to the radiationdominated case of preinflation independent of the length of inflation
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710.2386
Local Convexity Properties of j-metric Balls
This paper deals with local convexity properties of the j-metric. We consider convexity and starlikeness of the j-metric balls in convex, starlike and general subdomains of R^n.
math.MG
this paper deals with local convexity properties of the jmetric we consider convexity and starlikeness of the jmetric balls in convex starlike and general subdomains of rn
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710.2387
Characterizing arbitrarily slow convergence in the method of alternating projections
In 1997, Bauschke, Borwein, and Lewis have stated a trichotomy theorem that characterizes when the convergence of the method of alternating projections can be arbitrarily slow. However, there are two errors in their proof of this theorem. In this note, we show that although one of the errors is critical, the theorem itself is correct. We give a different proof that uses the multiplicative form of the spectral theorem, and the theorem holds in any real or complex Hilbert space, not just in a real Hilbert space.
math.FA math.OC
in 1997 bauschke borwein and lewis have stated a trichotomy theorem that characterizes when the convergence of the method of alternating projections can be arbitrarily slow however there are two errors in their proof of this theorem in this note we show that although one of the errors is critical the theorem itself is correct we give a different proof that uses the multiplicative form of the spectral theorem and the theorem holds in any real or complex hilbert space not just in a real hilbert space
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710.2388
On Chern-Moser normal forms of strongly pseudoconvex hypersurfaces with high-dimensional stability group
We explicitly describe germs of strongly pseudoconvex non-spherical real-analytic hypersurfaces $M$ at the origin in $\CC^{n+1}$ for which the group of local CR-automorphisms preserving the origin has dimension $d_0(M)$ equal to either $n^2-2n+1$ with $n\ge 2$, or $n^2-2n$ with $n\ge 3$. The description is given in terms of equations defining hypersurfaces near the origin, written in the Chern-Moser normal form. These results are motivated by the classification of locally homogeneous Levi non-degenerate hypersurfaces in $\CC^3$ with $d_0(M)=1,2$ due to A. Loboda, and complement earlier joint work by V. Ezhov and the author for the case $d_0(M)\ge n^2-2n+2$.
math.CV
we explicitly describe germs of strongly pseudoconvex nonspherical realanalytic hypersurfaces m at the origin in ccn1 for which the group of local crautomorphisms preserving the origin has dimension d_0m equal to either n22n1 with nge 2 or n22n with nge 3 the description is given in terms of equations defining hypersurfaces near the origin written in the chernmoser normal form these results are motivated by the classification of locally homogeneous levi nondegenerate hypersurfaces in cc3 with d_0m12 due to a loboda and complement earlier joint work by v ezhov and the author for the case d_0mge n22n2
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710.2389
Entanglement of formation from optimal decomposition
We present a new method of analytically deriving the entanglement of formation of the bipartite mixed state. The method realizes the optimal decomposition families of states. Our method can lead to many new results concerning entanglement of formation, its additivity and entanglement cost. We illustrate it by investigating the two-qubit state, the separable state, the maximally correlated state, the isotropic state and the Werner state.
quant-ph
we present a new method of analytically deriving the entanglement of formation of the bipartite mixed state the method realizes the optimal decomposition families of states our method can lead to many new results concerning entanglement of formation its additivity and entanglement cost we illustrate it by investigating the twoqubit state the separable state the maximally correlated state the isotropic state and the werner state
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710.239
Pion form factor from all-to-all propagators of overlap quarks
We report on our calculation of the pion electromagnetic form factor with two-flavors of dynamical overlap quarks. Gauge configurations are generated using the Iwasaki gauge action on a 16^3 \times 32 lattice at the lattice spacing of 0.12fm with sea quark masses down to m_s/6, where m_s is the physical strange quark mass. We describe our setup to measure the form factor through all-to-all quark propagators and present preliminary results.
hep-lat
we report on our calculation of the pion electromagnetic form factor with twoflavors of dynamical overlap quarks gauge configurations are generated using the iwasaki gauge action on a 163 times 32 lattice at the lattice spacing of 012fm with sea quark masses down to m_s6 where m_s is the physical strange quark mass we describe our setup to measure the form factor through alltoall quark propagators and present preliminary results
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710.2391
First-principles prediction of coexistence of magnetism and ferroelectricity in rhombohedral Bi2FeTiO6
First principles calculations based on the density functional theory within the local spin density approximation plus U(LSDA+U)scheme, show rhombohedral Bi$_2$FeTiO$_6$ is a potential multiferroic in which the magnetism and ferroelectricity coexist . A ferromagnetic configuration with magnetic moment of 4 $\mu_B$ per formula unit have been reported with respect to the minimum total energy. Spontaneous polarization of 27.3 $\mu$ C/cm$^2$, caused mainly by the ferroelectric distortions of Ti, was evaluated using the berry phase approach in the modern theory of polarization. The Bi-6s stereochemical activity of long-pair and the `d$^0$-ness' criterion in off-centring of Ti were coexisting in the predicted new system. In view of the oxidation state of Bi$^{3+}$,Fe$^{2+}$,Ti$^{4+}$, and O$^{2-}$ from the orbital-resolved density of states of the Bi-6p, Fe-3d,Ti-3d, and O-2p states,the valence state of Bi$_2$FeTiO$_6$ in the rhombohedral phase was found to be Bi$_2$$^{3+}$Fe$^{2+}$Ti$^{4+}$O$_6$.
cond-mat.mtrl-sci
first principles calculations based on the density functional theory within the local spin density approximation plus ulsdauscheme show rhombohedral bi_2fetio_6 is a potential multiferroic in which the magnetism and ferroelectricity coexist a ferromagnetic configuration with magnetic moment of 4 mu_b per formula unit have been reported with respect to the minimum total energy spontaneous polarization of 273 mu ccm2 caused mainly by the ferroelectric distortions of ti was evaluated using the berry phase approach in the modern theory of polarization the bi6s stereochemical activity of longpair and the d0ness criterion in offcentring of ti were coexisting in the predicted new system in view of the oxidation state of bi3fe2ti4 and o2 from the orbitalresolved density of states of the bi6p fe3dti3d and o2p statesthe valence state of bi_2fetio_6 in the rhombohedral phase was found to be bi_23fe2ti4o_6
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710.2392
Characterization of the Microstructure of Zirconolite-Based Glass-Ceramics
December 1991 legislation in France has spurred research on enhanced separation and conditioning or transmutation of long-lived radionuclides from high level radioactive wastes (HLW). In this field, we have studied zirconolite-based glass-ceramics in which the crystalline phase (zirconolite: CaZrTi2O7) aimed to preferentially incorporate minor actinides is embedded in a glassy calcium aluminosilicate matrix. At the laboratory scale, the crystallization of the parent glass is carried out thanks to a two-step thermal treatment: a nucleation stage followed by a growth stage. This paper presents the evolution of the crystallization, followed by scanning electron microscopy (SEM) and X-ray diffraction (XRD), with the temperature of the crystal growth thermal treatment, in the range 950 degrees - 1350 degrees C.
cond-mat.mtrl-sci
december 1991 legislation in france has spurred research on enhanced separation and conditioning or transmutation of longlived radionuclides from high level radioactive wastes hlw in this field we have studied zirconolitebased glassceramics in which the crystalline phase zirconolite cazrti2o7 aimed to preferentially incorporate minor actinides is embedded in a glassy calcium aluminosilicate matrix at the laboratory scale the crystallization of the parent glass is carried out thanks to a twostep thermal treatment a nucleation stage followed by a growth stage this paper presents the evolution of the crystallization followed by scanning electron microscopy sem and xray diffraction xrd with the temperature of the crystal growth thermal treatment in the range 950 degrees 1350 degrees c
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710.2393
Demailly-Semple jets of orders 4 and 5 in dimension 2
In view of Kobayashi's hyperbolicity conjecture, Demailly-Semple jets of orders 4 and 5 in dimension 2 are studied, some expectations about their algebraic tameness being (dis)proved, after systematic, substantial, formal, manual calculations.
math.CV math.AG
in view of kobayashis hyperbolicity conjecture demaillysemple jets of orders 4 and 5 in dimension 2 are studied some expectations about their algebraic tameness being disproved after systematic substantial formal manual calculations
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710.2394
Recent Progress in Effective Field Theory in the One-Nucleon Sector
Chiral perturbation theory (ChPT) is the effective field theory of the strong interactions at low energies. We will address the issue of a consistent power counting scheme in a manifestly Lorentz-invariant formulation of baryon ChPT. As applications we show how the inclusion of vector and axial-vector mesons in the calculation of the nucleon electromagnetic and axial form factors, respectively, lead to an improved description of the empirical data. Finally, we will outline a systematic implementation of the Delta(1232) resonance into the effective field theory program.
hep-ph
chiral perturbation theory chpt is the effective field theory of the strong interactions at low energies we will address the issue of a consistent power counting scheme in a manifestly lorentzinvariant formulation of baryon chpt as applications we show how the inclusion of vector and axialvector mesons in the calculation of the nucleon electromagnetic and axial form factors respectively lead to an improved description of the empirical data finally we will outline a systematic implementation of the delta1232 resonance into the effective field theory program
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710.2395
Stability of Palatini-f(R) cosmology
The evolution of linear cosmological perturbations in modified theories of gravity is investigated assuming the Palatini formalism. It has been discussed about the stability problem in this model based on the equivalence between f(R) gravity and the scalar tensor theory. However, we study this problem in the physical frame where the matter is minimally coupled. In general, the stability of the superhorizon metric evolution depends on models. We show that the deviation from the superhorizon metric evolution is null for a specific choice for the nonlinear Einstein-Hilbert action, $f(\hat{R}) \sim \hat{R}^{n}$, where $n \neq 0,2,3$. Thus the stability of metric fluctuation is guaranteed in these models. We also study the matter density fluctuation in the general gauge and show the differential equations in super and sub-horizon scales.
gr-qc astro-ph
the evolution of linear cosmological perturbations in modified theories of gravity is investigated assuming the palatini formalism it has been discussed about the stability problem in this model based on the equivalence between fr gravity and the scalar tensor theory however we study this problem in the physical frame where the matter is minimally coupled in general the stability of the superhorizon metric evolution depends on models we show that the deviation from the superhorizon metric evolution is null for a specific choice for the nonlinear einsteinhilbert action fhatr sim hatrn where n neq 023 thus the stability of metric fluctuation is guaranteed in these models we also study the matter density fluctuation in the general gauge and show the differential equations in super and subhorizon scales
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710.2396
A peculiar two point boundary value problem
In this paper we consider a one-dimensional diffusion equation on the interval $[0,1]$ satisfying non-Feller boundary conditions. As a consequence, the initial value Cauchy problem fails to preserve nonnegativity or boundedness. Nonetheless, probability theory plays an interesting role in our analysis and understanding of solutions to this equation.
math.PR
in this paper we consider a onedimensional diffusion equation on the interval 01 satisfying nonfeller boundary conditions as a consequence the initial value cauchy problem fails to preserve nonnegativity or boundedness nonetheless probability theory plays an interesting role in our analysis and understanding of solutions to this equation
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710.2397
Initial-Final Mass Relationship for Stars of Different Metallicities
Following Paczy\'{n}ski & Zi\'{o}lkowski (1968) and Han et al. (1994), we assume that the envelope of an asymptotic giant branch (AGB) or a first giant branch (FGB) star is lost when the binding energy of the envelope is equal to zero ($\Delta W=0$) and the core mass of the AGB star or the FGB star at the point ($\Delta W=0$) is taken as the final mass. Using this assumption, we calculate the IFMRs for stars of different metallicities.We find that the IFMRs depends strongly on the metallicity, i.e. $Z=0.0001, 0.0003, 0.001, 0.004, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.08$ and 0.1. From $Z=0.04$, the final mass of the stars with a given initial mass increases with increasing or decreasing metallicity. The difference of the final mass due to the metallicity may be up to 0.4 $M_{\odot}$. A linear fit of the initial-final mass relationship in NGC 2099 (M37) shows a potential evidence of the effect of metallicity on the IFMR. The IFMR for stars of $Z=0.02$ obtained in the paper matches well with those inferred observationally in the Galaxy. For $Z\geq 0.02$, helium WDs are obtained from the stars of $M_{\rm i}\leq 1.0 M_{\odot}$ and this result is upheld by the discovery of numerous low-mass WDs in NGC 6791 which is a metal-rich old open cluster. Using the IFMR for stars of $Z=0.02$ obtained in the paper, we have reproduced the mass distribution of DA WDs in Sloan DR4 except for some ultra-massive white dwarfs. The trend that the mean mass of WDs decreases with effective temperature may originate from the increase of the initial metallicities of stars. We predict that metal-rich low-mass stars may become under-massive white dwarfs.
astro-ph
following paczynski ziolkowski 1968 and han et al 1994 we assume that the envelope of an asymptotic giant branch agb or a first giant branch fgb star is lost when the binding energy of the envelope is equal to zero delta w0 and the core mass of the agb star or the fgb star at the point delta w0 is taken as the final mass using this assumption we calculate the ifmrs for stars of different metallicitieswe find that the ifmrs depends strongly on the metallicity ie z00001 00003 0001 0004 001 002 003 004 005 006 008 and 01 from z004 the final mass of the stars with a given initial mass increases with increasing or decreasing metallicity the difference of the final mass due to the metallicity may be up to 04 m_odot a linear fit of the initialfinal mass relationship in ngc 2099 m37 shows a potential evidence of the effect of metallicity on the ifmr the ifmr for stars of z002 obtained in the paper matches well with those inferred observationally in the galaxy for zgeq 002 helium wds are obtained from the stars of m_rm ileq 10 m_odot and this result is upheld by the discovery of numerous lowmass wds in ngc 6791 which is a metalrich old open cluster using the ifmr for stars of z002 obtained in the paper we have reproduced the mass distribution of da wds in sloan dr4 except for some ultramassive white dwarfs the trend that the mean mass of wds decreases with effective temperature may originate from the increase of the initial metallicities of stars we predict that metalrich lowmass stars may become undermassive white dwarfs
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710.2398
Differential Rotation in F Stars
Differential rotation can be detected in single line profiles of stars rotating more rapidly than about $v \sin{i} = 10$ km s$^{-1}$ with the Fourier transform technique. This allows to search for differential rotation in large samples to look for correlations between differential rotation and other stellar parameters. I analyze the fraction of differentially rotating stars as a function of color, rotation, and activity in a large sample of F-type stars. Color and rotation exhibit a correlation with differential rotation in the sense that more stars are rotating differentially in the cooler, less rapidly rotating stars. Effects of rotation and color, however, cannot be disentangled in the underlying sample. No trend with activity is found.
astro-ph
differential rotation can be detected in single line profiles of stars rotating more rapidly than about v sini 10 km s1 with the fourier transform technique this allows to search for differential rotation in large samples to look for correlations between differential rotation and other stellar parameters i analyze the fraction of differentially rotating stars as a function of color rotation and activity in a large sample of ftype stars color and rotation exhibit a correlation with differential rotation in the sense that more stars are rotating differentially in the cooler less rapidly rotating stars effects of rotation and color however cannot be disentangled in the underlying sample no trend with activity is found
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710.2399
Signatures of inflow motion in cores of massive star formation: Potential collapse candidates
Using the IRAM 30 m telescope, a mapping survey in optically thick and thin lines was performed towards 46 high mass star-forming regions. The sample includes UC H{\sc ii} precursors and UC H{\sc ii} regions. Seventeen sources are found to show "blue profiles", the expected signature of collapsing cores. The excess of sources with blue over red profiles ([$N_{\rm blue}$ -- $N_{\rm red}$]/$N_{\rm total}$) is 29% in the HCO$^+$ $J$=1--0 line, with a probability of 0.6% that this is caused by random fluctuations. UC H{\sc ii} regions show a higher excess (58%) than UC H{\sc ii} precursors (17%), indicating that material is still accreted after the onset of the UC H{\sc ii} phase. Similar differences in the excess of blue profiles as a function of evolutionary state are not observed in low mass star-forming regions. Thus, if confirmed for high mass star-forming sites, this would point at a fundamental difference between low- and high-mass star formation. Possible explanations are inadequate thermalization, stronger influence of outflows in massive early cores, larger gas reserves around massive stellar objects or different trigger mechanisms between low- and high- mass star formation.
astro-ph
using the iram 30 m telescope a mapping survey in optically thick and thin lines was performed towards 46 high mass starforming regions the sample includes uc hsc ii precursors and uc hsc ii regions seventeen sources are found to show blue profiles the expected signature of collapsing cores the excess of sources with blue over red profiles n_rm blue n_rm redn_rm total is 29 in the hco j10 line with a probability of 06 that this is caused by random fluctuations uc hsc ii regions show a higher excess 58 than uc hsc ii precursors 17 indicating that material is still accreted after the onset of the uc hsc ii phase similar differences in the excess of blue profiles as a function of evolutionary state are not observed in low mass starforming regions thus if confirmed for high mass starforming sites this would point at a fundamental difference between low and highmass star formation possible explanations are inadequate thermalization stronger influence of outflows in massive early cores larger gas reserves around massive stellar objects or different trigger mechanisms between low and high mass star formation
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710.24
On invisible plasma content in radio-loud AGNs: The case of TeV blazar Markarian 421
Invisible plasma content in blazar jets such as protons and/or thermal electron-positron ($e^{\pm}$) pairs is explored through combined arguments of dynamical and radiative processes. By comparing physical quantities required by the internal shock model with those obtained through the observed broadband spectra for Mrk 421, we obtain that the ratio of the Lorentz factors of a pair of cold shells resides in about $2\sim 20$, which implies that the shocks are at most mildly relativistic. Using the obtained Lorentz factors, the total mass density $\rho$ in the shocked shells is investigated. The upper limit of $\rho$ is obtained from the condition that thermal bremsstrahlung emission should not exceed the observed $\gamma$-ray luminosity, whilst the lower limit is constrained from the condition that the energy density of non-thermal electrons is smaller than that of the total plasma. Then we find $\rho$ is $10^2$-$10^3$ times heavier than that of non-thermal electrons for pure $e^{\pm}$ pairs, while $10^2$-$10^6$ times heavier for pure electron-proton ($e/p$) content, implying the existence of a large amount of invisible plasma. The origin of the continuous blazar sequence is shortly discussed and we speculate that the total mass density and/or the blending ratio of $e^{\pm}$ pairs and $e/p$ plasma could be new key quantities for the origin of the sequence.
astro-ph
invisible plasma content in blazar jets such as protons andor thermal electronpositron epm pairs is explored through combined arguments of dynamical and radiative processes by comparing physical quantities required by the internal shock model with those obtained through the observed broadband spectra for mrk 421 we obtain that the ratio of the lorentz factors of a pair of cold shells resides in about 2sim 20 which implies that the shocks are at most mildly relativistic using the obtained lorentz factors the total mass density rho in the shocked shells is investigated the upper limit of rho is obtained from the condition that thermal bremsstrahlung emission should not exceed the observed gammaray luminosity whilst the lower limit is constrained from the condition that the energy density of nonthermal electrons is smaller than that of the total plasma then we find rho is 102103 times heavier than that of nonthermal electrons for pure epm pairs while 102106 times heavier for pure electronproton ep content implying the existence of a large amount of invisible plasma the origin of the continuous blazar sequence is shortly discussed and we speculate that the total mass density andor the blending ratio of epm pairs and ep plasma could be new key quantities for the origin of the sequence
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710.2401
Tracing non-equilibrium plasma dynamics on the attosecond timescale in small clusters
It is shown that the energy absorption of a rare-gas cluster from a vacuum-ultraviolet (VUV) pulse can be traced with time-delayed extreme-ultraviolet (XUV) attosecond probe pulses by measuring the kinetic energy of the electrons detached by the probe pulse. By means of this scheme we demonstrate, that for pump pulses as short as one femtosecond, the charging of the cluster proceeds during the formation of an electronic nano-plasma inside the cluster. Using moderate harmonics for the VUV and high harmonics for the XUV pulse from the same near-infrared laser source, this scheme with well defined time delays between pump and probe pulses should be experimentally realizable. Going to even shorter pulse durations we predict that pump and probe pulses of about 250 attoseconds can induce and monitor non-equilibrium dynamics of the nano-plasma.
physics.atm-clus
it is shown that the energy absorption of a raregas cluster from a vacuumultraviolet vuv pulse can be traced with timedelayed extremeultraviolet xuv attosecond probe pulses by measuring the kinetic energy of the electrons detached by the probe pulse by means of this scheme we demonstrate that for pump pulses as short as one femtosecond the charging of the cluster proceeds during the formation of an electronic nanoplasma inside the cluster using moderate harmonics for the vuv and high harmonics for the xuv pulse from the same nearinfrared laser source this scheme with well defined time delays between pump and probe pulses should be experimentally realizable going to even shorter pulse durations we predict that pump and probe pulses of about 250 attoseconds can induce and monitor nonequilibrium dynamics of the nanoplasma
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710.2402
Intraday pattern in bid-ask spreads and its power-law relaxation for Chinese A-share stocks
We use high-frequency data of 1364 Chinese A-share stocks traded on the Shanghai Stock Exchange and Shenzhen Stock Exchange to investigate the intraday patterns in the bid-ask spreads. The daily periodicity in the spread time series is confirmed by Lomb analysis and the intraday bid-ask spreads are found to exhibit $L$-shaped pattern with idiosyncratic fine structure. The intraday spread of individual stocks relaxes as a power law within the first hour of the continuous double auction from 9:30AM to 10:30AM with exponents $\beta_{\rm{SHSE}}=0.19\pm0.069$ for the Shanghai market and $\beta_{\rm{SZSE}}=0.18\pm0.067$ for the Shenzhen market. The power-law relaxation exponent $\beta$ of individual stocks is roughly normally distributed. There is evidence showing that the accumulation of information widening the spread is an endogenous process.
q-fin.ST physics.soc-ph
we use highfrequency data of 1364 chinese ashare stocks traded on the shanghai stock exchange and shenzhen stock exchange to investigate the intraday patterns in the bidask spreads the daily periodicity in the spread time series is confirmed by lomb analysis and the intraday bidask spreads are found to exhibit lshaped pattern with idiosyncratic fine structure the intraday spread of individual stocks relaxes as a power law within the first hour of the continuous double auction from 930am to 1030am with exponents beta_rmshse019pm0069 for the shanghai market and beta_rmszse018pm0067 for the shenzhen market the powerlaw relaxation exponent beta of individual stocks is roughly normally distributed there is evidence showing that the accumulation of information widening the spread is an endogenous process
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710.2403
Double quantum dot as a probe of nonequilibrium charge fluctuations at the quantum point contact
Absorption of energy quanta generated by quantum point contact results in the inelastic current through the double quantum dot placed nearby. In contrast to a single quantum dot, the inelastic current through the double quantum dot is sensitive to the energy dependence of the quantum point contact transmission, which can explain the experimentally observed features. We calculate the inelastic current as a function of microscopic parameters of the circuit.
cond-mat.mes-hall
absorption of energy quanta generated by quantum point contact results in the inelastic current through the double quantum dot placed nearby in contrast to a single quantum dot the inelastic current through the double quantum dot is sensitive to the energy dependence of the quantum point contact transmission which can explain the experimentally observed features we calculate the inelastic current as a function of microscopic parameters of the circuit
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710.2404
Probing the Origin of the Large-angle CMB Anomalies
It has been argued that the large-angle cosmic microwave background anisotropy has anomalies at 3-sigma level. We review various proposed ideas to explain the origin of the anomalies and discuss how we can constrain the proposed models using future observational data.
astro-ph
it has been argued that the largeangle cosmic microwave background anisotropy has anomalies at 3sigma level we review various proposed ideas to explain the origin of the anomalies and discuss how we can constrain the proposed models using future observational data
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710.2405
Large deviations and adiabatic transitions for dynamical systems and Markov processes in fully coupled averaging
The work treats systems combining slow and fast motions depending on each other where fast motions are perturbations of families of either dynamical systems or Markov processes with freezed slow variable. In the first case we consider hyperbolic dynamical systems and in the second case we deal with random evolutions which are combinations of diffusions and continuous time Markov chains. We study first large deviations of the slow motion from the averaged one and then use these results together with some Markov property type arguments in order to describe very long time behavior of the slow motion such as its transitions between attractors of the averaged system.
math.DS math.PR
the work treats systems combining slow and fast motions depending on each other where fast motions are perturbations of families of either dynamical systems or markov processes with freezed slow variable in the first case we consider hyperbolic dynamical systems and in the second case we deal with random evolutions which are combinations of diffusions and continuous time markov chains we study first large deviations of the slow motion from the averaged one and then use these results together with some markov property type arguments in order to describe very long time behavior of the slow motion such as its transitions between attractors of the averaged system
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710.2406
Quasi-exactly solvable quasinormal modes
We consider quasinormal modes with complex energies from the point of view of the theory of quasi-exactly solvable (QES) models. We demonstrate that it is possible to find new potentials which admit exactly solvable or QES quasinormal modes by suitable complexification of parameters defining the QES potentials. Particularly, we obtain one QES and four exactly solvable potentials out of the five one-dimensional QES systems based on the $sl(2)$ algebra.
hep-th
we consider quasinormal modes with complex energies from the point of view of the theory of quasiexactly solvable qes models we demonstrate that it is possible to find new potentials which admit exactly solvable or qes quasinormal modes by suitable complexification of parameters defining the qes potentials particularly we obtain one qes and four exactly solvable potentials out of the five onedimensional qes systems based on the sl2 algebra
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710.2407
Physical implementation of topologically decoherence-protected superconducting qubits
We propose a scenario to physically implement a kind of topologically decoherence-protected qubit using superconducting devices coupled to a micro-wave cavity mode with unconventional geometric operations. It is shown that the two needed interactions for selective devices, which are required for implementing such protected qubits, as well as single-qubit gates, can be achieved by using the external magnetic flux. The easy combination of individual addressing with the many-device setup proposed in the system presents a distinct merit in comparison with the implementation of topologically protected qubits in a trapped-ion system.
quant-ph
we propose a scenario to physically implement a kind of topologically decoherenceprotected qubit using superconducting devices coupled to a microwave cavity mode with unconventional geometric operations it is shown that the two needed interactions for selective devices which are required for implementing such protected qubits as well as singlequbit gates can be achieved by using the external magnetic flux the easy combination of individual addressing with the manydevice setup proposed in the system presents a distinct merit in comparison with the implementation of topologically protected qubits in a trappedion system
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710.2408
Triplet Leptogenesis in Left-Right Symmetric Seesaw Models
We discuss scalar triplet leptogenesis in a specific left-right symmetric seesaw model. We show that the Majorana phases that are present in the model can be effectively used to saturate the existing upper limit on the CP-asymmetry of the triplets. We solve the relevant Boltzmann equations and analyze the viability of triplet leptogenesis. It is known for this kind of scenario that the efficiency of leptogenesis is maximal if there exists a hierarchy between the branching ratios of the triplet decays into leptons and Higgs particles. We show that triplet leptogenesis typically favors branching ratios with not too strong hierarchies, since maximal efficiency can only be obtained at the expense of suppressed CP-asymmetries.
hep-ph
we discuss scalar triplet leptogenesis in a specific leftright symmetric seesaw model we show that the majorana phases that are present in the model can be effectively used to saturate the existing upper limit on the cpasymmetry of the triplets we solve the relevant boltzmann equations and analyze the viability of triplet leptogenesis it is known for this kind of scenario that the efficiency of leptogenesis is maximal if there exists a hierarchy between the branching ratios of the triplet decays into leptons and higgs particles we show that triplet leptogenesis typically favors branching ratios with not too strong hierarchies since maximal efficiency can only be obtained at the expense of suppressed cpasymmetries
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710.2409
Precise predictions for MSSM Higgs-boson production in bottom-quark fusion
The main production mechanism for supersymmetric Higgs particles at hadron colliders crucially depends on the size of their Yukawa couplings to bottom quarks. For sufficiently large tan(beta) the total cross section for some of the neutral Higgs bosons in the MSSM is dominated by bottom-quark fusion. After an introduction to bottom-associated Higgs production, we discuss the complete O(alpha) electroweak and O(alpha_s) strong corrections for the bb-fusion channel in the MSSM. Choosing proper renormalization and input-parameter schemes, an improved Born approximation, constructed from previously known results, can absorb the bulk of the corrections so that the remaining non-universal corrections are typically of the order of a few per cent. Numerical results are discussed for the SPS benchmark scenarios.
hep-ph
the main production mechanism for supersymmetric higgs particles at hadron colliders crucially depends on the size of their yukawa couplings to bottom quarks for sufficiently large tanbeta the total cross section for some of the neutral higgs bosons in the mssm is dominated by bottomquark fusion after an introduction to bottomassociated higgs production we discuss the complete oalpha electroweak and oalpha_s strong corrections for the bbfusion channel in the mssm choosing proper renormalization and inputparameter schemes an improved born approximation constructed from previously known results can absorb the bulk of the corrections so that the remaining nonuniversal corrections are typically of the order of a few per cent numerical results are discussed for the sps benchmark scenarios
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710.241
Modified Lattice Landau Gauge
We propose a modified lattice Landau gauge based on stereographically projecting the link variables on the circle S^1 -> R for compact U(1) or the 3-sphere S^3 -> R^3 for SU(2) before imposing the Landau gauge condition. This can reduce the number of Gribov copies exponentially and solves the Gribov problem in compact U(1) where it is a lattice artifact. Applied to the maximal Abelian subgroup this might be just enough to avoid the perfect cancellation amongst the Gribov copies in a lattice BRST formulation for SU(N), and thus to avoid the Neuberger 0/0 problem. The continuum limit of the Landau gauge remains unchanged.
hep-lat
we propose a modified lattice landau gauge based on stereographically projecting the link variables on the circle s1 r for compact u1 or the 3sphere s3 r3 for su2 before imposing the landau gauge condition this can reduce the number of gribov copies exponentially and solves the gribov problem in compact u1 where it is a lattice artifact applied to the maximal abelian subgroup this might be just enough to avoid the perfect cancellation amongst the gribov copies in a lattice brst formulation for sun and thus to avoid the neuberger 00 problem the continuum limit of the landau gauge remains unchanged
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710.2411
The Kontsevich weight of a wheel with spokes pointing outward
This is a companion note to ``Hochschild cohomology and Atiyah classes'' by Damien Calaque and the author. Using elementary methods we compute the Kontsevich weight of a wheel with spokes pointing outward. The result is in terms of modified Bernouilli numbers. The same result had been obtained earlier by Torossian (unpublished) and also recently by Thomas Willmacher using more advanced methods.
math.CO
this is a companion note to hochschild cohomology and atiyah classes by damien calaque and the author using elementary methods we compute the kontsevich weight of a wheel with spokes pointing outward the result is in terms of modified bernouilli numbers the same result had been obtained earlier by torossian unpublished and also recently by thomas willmacher using more advanced methods
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710.2412
Nonet symmetry in \eta, \eta^{\prime} and B\to K\eta,K\eta^{\prime} decays
The nonet symmetry scheme seems to describe rather well the masses and $\eta-\eta^{\prime}$ mixing angle of the ground state pseudo-scalar mesons. It is expected that nonet symmetry should also be valid for the matrix elements of the pseudo-scalar densitty operators which play an important role in charmless two-body B decays with $\eta$ or $\eta^{\prime}$ in the final state. Starting from the divergences of the SU(3) octet and singlet axial vector currents, we show that nonet symmetry for the pseudo-scalar mass term implies nonet symmetry for the pseudo-scalar density operators. In this nonet symmetry scheme, we find that the branching ratio $B\to PP,PV$, with $\eta$ in the final state agrees well with data, while those with $\eta'$ are underestimated, but by increasing the $B\to \eta'$ form factor by $40-50%$, one could explain the tree-dominated $B^{-}\to \pi^{-}\eta'$ and $B^{-}\to \rho^{-}\eta'$ measured branching ratios. With this increased form factor and with only a moderate annihilation contribution, we are able to obtain $62\times 10^{-6}$ for the penguin-dominated $B^{-}\to K^{-}\eta'$ branching ratios, quite close to the measured value. This supports the predicted value for the $B\to \eta'$ form factor in PQCD and light-cone sum rules approach. A possible increase by 15% of $<0|\bar{s} i\gamma_5 s|s\bar{s}>$ for $\eta_{0} $ would bring the predicted $B^{-}\to K^{-}\eta'$ branching ratio to $69.375\times 10^{-6}$, very close to experiment.
hep-ph hep-ex
the nonet symmetry scheme seems to describe rather well the masses and etaetaprime mixing angle of the ground state pseudoscalar mesons it is expected that nonet symmetry should also be valid for the matrix elements of the pseudoscalar densitty operators which play an important role in charmless twobody b decays with eta or etaprime in the final state starting from the divergences of the su3 octet and singlet axial vector currents we show that nonet symmetry for the pseudoscalar mass term implies nonet symmetry for the pseudoscalar density operators in this nonet symmetry scheme we find that the branching ratio bto pppv with eta in the final state agrees well with data while those with eta are underestimated but by increasing the bto eta form factor by 4050 one could explain the treedominated bto pieta and bto rhoeta measured branching ratios with this increased form factor and with only a moderate annihilation contribution we are able to obtain 62times 106 for the penguindominated bto keta branching ratios quite close to the measured value this supports the predicted value for the bto eta form factor in pqcd and lightcone sum rules approach a possible increase by 15 of 0bars igamma_5 ssbars for eta_0 would bring the predicted bto keta branching ratio to 69375times 106 very close to experiment
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710.2413
Inverted Hybrid Inflation as a solution to gravitino problems in Gravity Mediation
It was recently found that the decay of inflaton and the SUSY breaking field produces many gravitinos in the gravity mediation scenario. These discoveries led to an exclusion of many inflation models such as chaotic, (smooth) hybrid, topological and new inflation models. Under these circumstances we searched for a successful inflation model and found that the ``inverted'' hybrid inflation models can solve the gravitino overproduction problem by their distinctive shape of the potential. Furthermore, we found that this inflation model simultaneously can explain the observed baryon asymmetry through the non-thermal leptogenesis and is consistent with the WMAP results, that is, $n_s=0.951^{+0.015}_{-0.019}$ and the negligible tensor to scalar ratio.
hep-ph
it was recently found that the decay of inflaton and the susy breaking field produces many gravitinos in the gravity mediation scenario these discoveries led to an exclusion of many inflation models such as chaotic smooth hybrid topological and new inflation models under these circumstances we searched for a successful inflation model and found that the inverted hybrid inflation models can solve the gravitino overproduction problem by their distinctive shape of the potential furthermore we found that this inflation model simultaneously can explain the observed baryon asymmetry through the nonthermal leptogenesis and is consistent with the wmap results that is n_s09510015_0019 and the negligible tensor to scalar ratio
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710.2414
Exchange Reactions with Dick Dalitz
An account is given of the close collaboration of Dick Dalitz with the European K- Collaboration over many decades in many aspects of hypernuclear physics. In particular, emphasis is given to the topics of double hypernuclei and the discovery and resolution of p-wave Lambda strangeness exchange states.
physics.hist-ph
an account is given of the close collaboration of dick dalitz with the european k collaboration over many decades in many aspects of hypernuclear physics in particular emphasis is given to the topics of double hypernuclei and the discovery and resolution of pwave lambda strangeness exchange states
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710.2415
Single Production of Doubly Charged Higgsinos at linear e-e- colliders
Several extended supersymmetric models, motivated by either grand unification, or by neutrino mass generation, predict light doubly charged higgsinos. We study the production of a single doubly charged higgsino and its decay channels at the International Linear Collider (ILC) operating in the e-e- mode. We analyze the production cross section for e-e- --> tilde{Delta}^{--}_{L,R} chi^0_1 as a function of different kinematic variables, followed by the decay, through several channels, of the doubly charged higgsino into a final state of two leptons plus missing energy. We include the standard model background and discuss how kinematic cuts could be used effectively to limit this background. Single production of these exotics could provide a spectacular signal for a new underlying symmetry and for physics beyond the minimal supersymmetric standard model.
hep-ph
several extended supersymmetric models motivated by either grand unification or by neutrino mass generation predict light doubly charged higgsinos we study the production of a single doubly charged higgsino and its decay channels at the international linear collider ilc operating in the ee mode we analyze the production cross section for ee tildedelta_lr chi0_1 as a function of different kinematic variables followed by the decay through several channels of the doubly charged higgsino into a final state of two leptons plus missing energy we include the standard model background and discuss how kinematic cuts could be used effectively to limit this background single production of these exotics could provide a spectacular signal for a new underlying symmetry and for physics beyond the minimal supersymmetric standard model
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710.2416
Low Scale Leptogenesis and Dark Matter Candidates in an Extended Seesaw Model
We consider a variant of seesaw mechanism by introducing extra singlet neutrinos and singlet scalar boson, and show how low scale leptogenesis is successfully realized in this scenario. We examine if the newly introduced neutral particles, either singlet Majorana neutrino or singlet scalar boson, can be a candidate for dark matter. We also discuss the implications of the dark matter detection through the scattering off the nucleus of the detecting material on our scenarios for dark matter. In addition, we study the implications for the search of invisible Higgs decay at LHC, which may serve as a probe of our scenario for dark matter.
hep-ph
we consider a variant of seesaw mechanism by introducing extra singlet neutrinos and singlet scalar boson and show how low scale leptogenesis is successfully realized in this scenario we examine if the newly introduced neutral particles either singlet majorana neutrino or singlet scalar boson can be a candidate for dark matter we also discuss the implications of the dark matter detection through the scattering off the nucleus of the detecting material on our scenarios for dark matter in addition we study the implications for the search of invisible higgs decay at lhc which may serve as a probe of our scenario for dark matter
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710.2417
Finite volume spectrum of N=1 superminimal models perturbed by $\Phi_{13}$
We describe an extension of the nonlinear integral equation (NLIE) tehnique to N=1 superminimal models perturbed by $\Phi_{13}$. Along the way, we also complete our previous studies of the finite volume spectrum of the N=1 supersymmetric sine-Gordon model by considering the attractive regime and more specifically, breather states.
hep-th
we describe an extension of the nonlinear integral equation nlie tehnique to n1 superminimal models perturbed by phi_13 along the way we also complete our previous studies of the finite volume spectrum of the n1 supersymmetric sinegordon model by considering the attractive regime and more specifically breather states
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710.2418
H.E.S.S. Galactic Plane Survey unveils a Milagro Hotspot
We report here on a new VHE source, HESS J1908+063, disovered during the extended H.E.S.S. survey of the Galactic plane and which coincides with the recently reported MILAGRO unidentied source MGRO J1908+06. The position, extension and spectrum measurements of the HESS source are presented and compared to those of MGRO J1908+06. Possible counterparts at other wavelenghts are discussed. For the first time one of the low-lattitude MILAGRO sources is confirmed.
astro-ph
we report here on a new vhe source hess j1908063 disovered during the extended hess survey of the galactic plane and which coincides with the recently reported milagro unidentied source mgro j190806 the position extension and spectrum measurements of the hess source are presented and compared to those of mgro j190806 possible counterparts at other wavelenghts are discussed for the first time one of the lowlattitude milagro sources is confirmed
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710.2419
The Variable Hierarchy for the Games mu-Calculus
Parity games are combinatorial representations of closed Boolean mu-terms. By adding to them draw positions, they have been organized by Arnold and one of the authors into a mu-calculus. As done by Berwanger et al. for the propositional modal mu-calculus, it is possible to classify parity games into levels of a hierarchy according to the number of fixed-point variables. We ask whether this hierarchy collapses w.r.t. the standard interpretation of the games mu-calculus into the class of all complete lattices. We answer this question negatively by providing, for each n >= 1, a parity game Gn with these properties: it unravels to a mu-term built up with n fixed-point variables, it is semantically equivalent to no game with strictly less than n-2 fixed-point variables.
cs.LO cs.GT math.LO
parity games are combinatorial representations of closed boolean muterms by adding to them draw positions they have been organized by arnold and one of the authors into a mucalculus as done by berwanger et al for the propositional modal mucalculus it is possible to classify parity games into levels of a hierarchy according to the number of fixedpoint variables we ask whether this hierarchy collapses wrt the standard interpretation of the games mucalculus into the class of all complete lattices we answer this question negatively by providing for each n 1 a parity game gn with these properties it unravels to a muterm built up with n fixedpoint variables it is semantically equivalent to no game with strictly less than n2 fixedpoint variables
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710.242
Magnetoplasmons excitations in graphene for filling factors $\nu \leq 6$
In the frame of the Hartree-Fock approximation, the dispersion of magnetoplasmons in Graphene is derived for all types of transitions for filling factors $\nu\leq 6$. The optical conductivity components of the magnetoplasmon curves are calculated. It is shown that the electron-electron interactions lead to a strong re-normalization of the apparent Fermi velocity of Graphene which is different for different types of transitions.
cond-mat.str-el cond-mat.mes-hall
in the frame of the hartreefock approximation the dispersion of magnetoplasmons in graphene is derived for all types of transitions for filling factors nuleq 6 the optical conductivity components of the magnetoplasmon curves are calculated it is shown that the electronelectron interactions lead to a strong renormalization of the apparent fermi velocity of graphene which is different for different types of transitions
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710.2421
Spontaneous emission spectrum of a two-level atom in a very high Q cavity
In this paper we consider an initially excited two-level system coupled to a monomode cavity, and compute exact expressions for the spectra spontaneously emitted by each system in the general case where they have arbitrary linewidths and frequencies. Our method is based on the fact that this problem has an easily solvable classical counterpart, which provides a clear interpretation of the evidenced phenomena. We show that if the cavity linewidth is much lower than the atomic linewidth, photons are emitted at the cavity frequency, even if the atom and the cavity are strongly detuned. We also study the links between the spontaneous emission spectra and the fluorescence spectra emitted when the atom is driven by a classical field of tunable frequency.
quant-ph
in this paper we consider an initially excited twolevel system coupled to a monomode cavity and compute exact expressions for the spectra spontaneously emitted by each system in the general case where they have arbitrary linewidths and frequencies our method is based on the fact that this problem has an easily solvable classical counterpart which provides a clear interpretation of the evidenced phenomena we show that if the cavity linewidth is much lower than the atomic linewidth photons are emitted at the cavity frequency even if the atom and the cavity are strongly detuned we also study the links between the spontaneous emission spectra and the fluorescence spectra emitted when the atom is driven by a classical field of tunable frequency
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710.2422
Soft-gluon resummation for Higgs differential distributions at the Large Hadron Collider
We study the transverse-momentum (q_T) and rapidity (y) distributions of the Higgs boson in perturbative QCD, including the most advanced theoretical information presently available: fixed-order perturbation theory at Next-to-Leading Order (NLO) in the large-q_T region (q_T ~ M_H, being M_H the Higgs mass), and soft-gluon resummation at the Next-to-Next-to-Leading Logarithmic accuracy (NNLL) in the small-q_T region (q_T << M_H). We present numerical results for the doubly-differential (q_T and y) cross section for the production of a Standard Model Higgs boson at the Large Hadron Collider (LHC).
hep-ph
we study the transversemomentum q_t and rapidity y distributions of the higgs boson in perturbative qcd including the most advanced theoretical information presently available fixedorder perturbation theory at nexttoleading order nlo in the largeq_t region q_t m_h being m_h the higgs mass and softgluon resummation at the nexttonexttoleading logarithmic accuracy nnll in the smallq_t region q_t m_h we present numerical results for the doublydifferential q_t and y cross section for the production of a standard model higgs boson at the large hadron collider lhc
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710.2423
Centrality dependence of some characteristics of relativistic nuclear interactions and percolation cluster formation
Some of the centrality experiments indicate regime change and saturation in the behaviour of characteristics of the secondary particles produced in relativistic nuclear interactions. We discuss that the responsible mechanism to explain the phenomena could be the percolation cluster formation and we expect appearance of deconfinement in the cluster.
nucl-ex
some of the centrality experiments indicate regime change and saturation in the behaviour of characteristics of the secondary particles produced in relativistic nuclear interactions we discuss that the responsible mechanism to explain the phenomena could be the percolation cluster formation and we expect appearance of deconfinement in the cluster
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710.2424
The Nicolas and Robin inequalities with sums of two squares
In 1984, G. Robin proved that the Riemann hypothesis is true if and only if the Robin inequality $\sigma(n)<e^\gamma n\log\log n$ holds for every integer $n>5040$, where $\sigma(n)$ is the sum of divisors function, and $\gamma$ is the Euler-Mascheroni constant. We exhibit a broad class of subsets $\cS$ of the natural numbers such that the Robin inequality holds for all but finitely many $n\in\cS$. As a special case, we determine the finitely many numbers of the form $n=a^2+b^2$ that do not satisfy the Robin inequality. In fact, we prove our assertions with the Nicolas inequality $n/\phi(n)<e^{\gamma}\log \log n$; since $\sigma(n)/n<n/\phi(n)$ for $n>1$ our results for the Robin inequality follow at once.
math.NT
in 1984 g robin proved that the riemann hypothesis is true if and only if the robin inequality sigmanegamma nloglog n holds for every integer n5040 where sigman is the sum of divisors function and gamma is the eulermascheroni constant we exhibit a broad class of subsets cs of the natural numbers such that the robin inequality holds for all but finitely many nincs as a special case we determine the finitely many numbers of the form na2b2 that do not satisfy the robin inequality in fact we prove our assertions with the nicolas inequality nphinegammalog log n since sigmannnphin for n1 our results for the robin inequality follow at once
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710.2425
A variational principle for hardening elastoplasticity
We present a variational principle governing the quasistatic evolution of a linearized elastoplastic material. In case of linear hardening, the novel characterization allows to recover and partly extend some known results and proves itself to be especially well-suited for discussing general approximation and convergence issues. In particular, the variational principle is exploited in order to prove in a novel setting the convergence of time and space-time discretizations as well as to provide some possible a posteriori error control.
math.AP
we present a variational principle governing the quasistatic evolution of a linearized elastoplastic material in case of linear hardening the novel characterization allows to recover and partly extend some known results and proves itself to be especially wellsuited for discussing general approximation and convergence issues in particular the variational principle is exploited in order to prove in a novel setting the convergence of time and spacetime discretizations as well as to provide some possible a posteriori error control
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710.2426
Low angular momentum accretion flow model of Sgr A* activity
Sgr A* is a source of strongly variable emission in several energy bands. It is generally agreed that this emission comes from the material surrounding the black hole which is either falling in or flowing out. The activity must be driven by accretion but the character of accretion flow in this object is an open question. We suggest that the inflow is dominated by the relatively low angular momentum material originating in one of the nearby group of stars. Such material flows in directly towards the black hole up to the distance of order of ten Schwarzschild radii or less, where it hits the angular momentum barrier which leads naturally to a flow variability. We study both the analytical and the numerical solutions for the flow dynamics, and we analyze the radiation spectra in both cases using the Monte Carlo code to simulate the synchrotron, bremsstrahlung and the Compton scattering. Our model roughly reproduces the broad band spectrum of Sgr A* and its variability if we allow for a small fraction of energy to be converted to non-thermal population of electrons. It is also consistent (for a range of viewing angles) with the strong constraints on the amount of circumnuclear material imposed by the measurements of the Faraday rotation.
astro-ph
sgr a is a source of strongly variable emission in several energy bands it is generally agreed that this emission comes from the material surrounding the black hole which is either falling in or flowing out the activity must be driven by accretion but the character of accretion flow in this object is an open question we suggest that the inflow is dominated by the relatively low angular momentum material originating in one of the nearby group of stars such material flows in directly towards the black hole up to the distance of order of ten schwarzschild radii or less where it hits the angular momentum barrier which leads naturally to a flow variability we study both the analytical and the numerical solutions for the flow dynamics and we analyze the radiation spectra in both cases using the monte carlo code to simulate the synchrotron bremsstrahlung and the compton scattering our model roughly reproduces the broad band spectrum of sgr a and its variability if we allow for a small fraction of energy to be converted to nonthermal population of electrons it is also consistent for a range of viewing angles with the strong constraints on the amount of circumnuclear material imposed by the measurements of the faraday rotation
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710.2427
Helac-Phegas: a generator for all parton level processes
The updated version of the Helac-Phegas event generator is presented. The matrix elements are calculated through Dyson-Schwinger recursive equations. Helac-Phegas generates parton-level events with all necessary information, in the most recent Les Houches Accord format, for the study of any process within the Standard Model in hadron and lepton colliders.
hep-ph hep-ex physics.data-an
the updated version of the helacphegas event generator is presented the matrix elements are calculated through dysonschwinger recursive equations helacphegas generates partonlevel events with all necessary information in the most recent les houches accord format for the study of any process within the standard model in hadron and lepton colliders
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710.2428
The anomaly in the cosmic-ray positron spectrum
A recent analysis of cosmic-ray data from a space borne experiment by the AMS collaboration supports the observation of an excess in the cosmic-ray positron spectrum by previous balloon experiments. The combination of the various experimental data establishes a deviation from the expected background with a significance of more than four standard deviations. The observed change in the spectral index cannot be explained without introducing a new source of positrons. When interpreted within the MSSM a consistent description of the antiproton spectrum, the diffuse gamma-ray flux and the positron fraction is obtained which is compatible with all other experimental data, including recent WMAP data.
astro-ph
a recent analysis of cosmicray data from a space borne experiment by the ams collaboration supports the observation of an excess in the cosmicray positron spectrum by previous balloon experiments the combination of the various experimental data establishes a deviation from the expected background with a significance of more than four standard deviations the observed change in the spectral index cannot be explained without introducing a new source of positrons when interpreted within the mssm a consistent description of the antiproton spectrum the diffuse gammaray flux and the positron fraction is obtained which is compatible with all other experimental data including recent wmap data
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710.2429
(g-2)_mu and supersymmetry: status and prospects
The experimental determination of the muon magnetic moment and its theoretical prediction within the Standard Model and the MSSM are reviewed. A 3 sigma deviation between experiment and Standard Model prediction has been established, and supersymmetry could provide a natural explation of this deviation. Possible future improvements and the case for a new experiment are discussed.
hep-ph
the experimental determination of the muon magnetic moment and its theoretical prediction within the standard model and the mssm are reviewed a 3 sigma deviation between experiment and standard model prediction has been established and supersymmetry could provide a natural explation of this deviation possible future improvements and the case for a new experiment are discussed
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710.243
Tackling the SUSY flavour & CP problem - SUGRA versus SU(3)
We comment on the power of the 'standard' solutions to the SUSY flavour and CP problem based on supergravity and its derivates like mSUGRA in comparison to the flavour symmetry approach. It is argued that flavour symmetries, and SU(3) in particular, can not only mimic the situation in supergravity frameworks in this respect, but sometimes do even better providing at the same time a further link between the soft and Yukawa sectors, that could be testable at future experimental facilities.
hep-ph
we comment on the power of the standard solutions to the susy flavour and cp problem based on supergravity and its derivates like msugra in comparison to the flavour symmetry approach it is argued that flavour symmetries and su3 in particular can not only mimic the situation in supergravity frameworks in this respect but sometimes do even better providing at the same time a further link between the soft and yukawa sectors that could be testable at future experimental facilities
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710.2431
Control of recollision wave packets for molecular orbital tomography using short laser pulses
The tomographic imaging of arbitrary molecular orbitals via high-order harmonic generation requires that electrons recollide from one direction only. Within a semi-classical model, we show that extremely short phase-stabilized laser pulses offer control over the momentum distribution of the returning electrons. By adjusting the carrier-envelope phase, recollisions can be forced to occur from mainly one side, while retaining a broad energy spectrum. The signatures of the semi-classical distributions are observed in harmonic spectra obtained by numerical solution of the time-dependent Schr\"{o}dinger equation.
physics.atom-ph
the tomographic imaging of arbitrary molecular orbitals via highorder harmonic generation requires that electrons recollide from one direction only within a semiclassical model we show that extremely short phasestabilized laser pulses offer control over the momentum distribution of the returning electrons by adjusting the carrierenvelope phase recollisions can be forced to occur from mainly one side while retaining a broad energy spectrum the signatures of the semiclassical distributions are observed in harmonic spectra obtained by numerical solution of the timedependent schrodinger equation
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710.2432
Isospectral orbifolds with different maximal isotropy orders
We construct pairs of compact Riemannian orbifolds which are isospectral for the Laplace operator on functions such that the maximal isotropy order of singular points in one of the orbifolds is higher than in the other. In one type of examples, isospectrality arises from a version of the famous Sunada theorem which also implies isospectrality on $p$-forms; here the orbifolds are quotients of certain compact normal homogeneous spaces. In another type of examples, the orbifolds are quotients of Euclidean $\R^3$ and are shown to be isospectral on functions using dimension formulas for the eigenspaces. In the latter type of examples the orbifolds are not isospectral on 1-forms. Along the way we also give several additional examples of isospectral orbifolds which do not have maximal isotropy groups of different size but other interesting properties.
math.DG
we construct pairs of compact riemannian orbifolds which are isospectral for the laplace operator on functions such that the maximal isotropy order of singular points in one of the orbifolds is higher than in the other in one type of examples isospectrality arises from a version of the famous sunada theorem which also implies isospectrality on pforms here the orbifolds are quotients of certain compact normal homogeneous spaces in another type of examples the orbifolds are quotients of euclidean r3 and are shown to be isospectral on functions using dimension formulas for the eigenspaces in the latter type of examples the orbifolds are not isospectral on 1forms along the way we also give several additional examples of isospectral orbifolds which do not have maximal isotropy groups of different size but other interesting properties
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710.2433
Astrophysical Condition on the attolensing as a possible probe for a modified gravity theory
We investigate the wave effect in the gravitational lensing by a black hole with very tiny mass less than 10^-19 solar mass, which is called attolensing, motivated by a recent report that the lensing signature might be a possible probe of a modified gravity theory in the braneworld scenario. We focus on the finite source size effect and the effect of the relative motion of the source to the lens, which are influential to the wave effect in the attolensing. Astrophysical condition that the lensed interference signature can be a probe of the modified gravity theory is demonstrated. The interference signature in the microlensing system is also discussed.
astro-ph
we investigate the wave effect in the gravitational lensing by a black hole with very tiny mass less than 1019 solar mass which is called attolensing motivated by a recent report that the lensing signature might be a possible probe of a modified gravity theory in the braneworld scenario we focus on the finite source size effect and the effect of the relative motion of the source to the lens which are influential to the wave effect in the attolensing astrophysical condition that the lensed interference signature can be a probe of the modified gravity theory is demonstrated the interference signature in the microlensing system is also discussed
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710.2434
Integrability of geodesic flows and isospectrality of Riemannian manifolds
We construct a pair of compact, eight-dimensional, two-step Riemannian nilmanifolds $M$ and $M'$ which are isospectral for the Laplace operator on functions and such that $M$ has completely integrable geodesic flow in the sense of Liouville, while $M'$ has not. Moreover, for both manifolds we analyze the structure of the submanifolds of the unit tangent bundle given by to maximal continuous families of closed geodesics with generic velocity fields. The structure of these submanifolds turns out to reflect the above (non)integrability properties. On the other hand, their dimension is larger than that of the Lagrangian tori in $M$, indicating a degeneracy which might explain the fact that the wave invariants do not distinguish an integrable from a nonintegrable system here. Finally, we show that for $M$, the invariant eight-dimensional tori which are foliated by closed geodesics are dense in the unit tangent bundle, and that both $M$ and $M'$ satisfy the so-called Clean Intersection Hypothesis.
math.DG
we construct a pair of compact eightdimensional twostep riemannian nilmanifolds m and m which are isospectral for the laplace operator on functions and such that m has completely integrable geodesic flow in the sense of liouville while m has not moreover for both manifolds we analyze the structure of the submanifolds of the unit tangent bundle given by to maximal continuous families of closed geodesics with generic velocity fields the structure of these submanifolds turns out to reflect the above nonintegrability properties on the other hand their dimension is larger than that of the lagrangian tori in m indicating a degeneracy which might explain the fact that the wave invariants do not distinguish an integrable from a nonintegrable system here finally we show that for m the invariant eightdimensional tori which are foliated by closed geodesics are dense in the unit tangent bundle and that both m and m satisfy the socalled clean intersection hypothesis
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710.2435
Primordial magnetic fields and nonlinear electrodynamics
The creation of large scale magnetic fields is studied in an inflationary universe where electrodynamics is assumed to be nonlinear. After inflation ends electrodynamics becomes linear and thus the description of reheating and the subsequent radiation dominated stage are unaltered. The nonlinear regime of electrodynamics is described by lagrangians having a power law dependence on one of the invariants of the electromagnetic field. It is found that there is a range of parameters for which primordial magnetic fields of cosmologically interesting strengths can be created.
astro-ph
the creation of large scale magnetic fields is studied in an inflationary universe where electrodynamics is assumed to be nonlinear after inflation ends electrodynamics becomes linear and thus the description of reheating and the subsequent radiation dominated stage are unaltered the nonlinear regime of electrodynamics is described by lagrangians having a power law dependence on one of the invariants of the electromagnetic field it is found that there is a range of parameters for which primordial magnetic fields of cosmologically interesting strengths can be created
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710.2436
Optical afterglows of gamma-ray bursts: a bimodal distribution?"
The luminosities of the optical afterglows of Gamma Ray Bursts, 12 hours (rest frame time) after the trigger, show a surprising clustering, with a minority of events being at a significant smaller luminosity. If real, this dichotomy would be a crucial clue to understand the nature of optically dark afterglows, i.e. bursts that are detected in the X-ray band, but not in the optical. We investigate this issue by studying bursts of the pre-Swift era, both detected and undetected in the optical. The limiting magnitudes of the undetected ones are used to construct the probability that a generic bursts is observed down to a given magnitude limit. Then, by simulating a large number of bursts with pre-assigned characteristics, we can compare the properties of the observed optical luminosity distribution with the simulated one. Our results suggest that the hints of bimodality present in the observed distribution reflects a real bimodality: either the optical luminosity distributions of bursts is intrinsically bimodal, or there exists a population of bursts with a quite significant grey absorption, i.e. wavelength independent extinction. This population of intrinsically weak or grey-absorbed events can be associated to dark bursts.
astro-ph
the luminosities of the optical afterglows of gamma ray bursts 12 hours rest frame time after the trigger show a surprising clustering with a minority of events being at a significant smaller luminosity if real this dichotomy would be a crucial clue to understand the nature of optically dark afterglows ie bursts that are detected in the xray band but not in the optical we investigate this issue by studying bursts of the preswift era both detected and undetected in the optical the limiting magnitudes of the undetected ones are used to construct the probability that a generic bursts is observed down to a given magnitude limit then by simulating a large number of bursts with preassigned characteristics we can compare the properties of the observed optical luminosity distribution with the simulated one our results suggest that the hints of bimodality present in the observed distribution reflects a real bimodality either the optical luminosity distributions of bursts is intrinsically bimodal or there exists a population of bursts with a quite significant grey absorption ie wavelength independent extinction this population of intrinsically weak or greyabsorbed events can be associated to dark bursts
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710.2437
Discovery of 18 Jupiter mass RV companion orbiting the brown dwarf candidate ChaHa8
We report the discovery of a 16-20 Jupiter mass radial velocity companion around the very young (3 Myr) brown dwarf candidate ChaHa8. Based on high-resolution echelle spectra of ChaHa8 taken between 2000 and 2007 with UVES at the VLT, a companion was detected through RV variability with a semi-amplitude of 1.6 km/s. A Kepler fit to the data yields an orbital period of the companion of 1590 days and an eccentricity of e=0.49. A companion minimum mass M2sin i between 16 and 20 Jupiter masses is derived when using model-dependent mass estimates for the primary. The mass ratio M2/M1 might be as small as 0.2 and, with a probability of 87%, it is less than 0.4. ChaHa8 harbors most certainly the lowest mass companion detected so far in a close (~1 AU) orbit around a brown dwarf or very low-mass star. From the uncertainty in the orbit solution, it cannot completely be ruled out that the companion has a mass in the planetary regime. Its discovery is in any case an important step towards RV planet detections around BDs. Further, ChaHa8 is the fourth known spectroscopic brown dwarf or very low-mass binary system with an RV orbit solution and the second known very young one.
astro-ph
we report the discovery of a 1620 jupiter mass radial velocity companion around the very young 3 myr brown dwarf candidate chaha8 based on highresolution echelle spectra of chaha8 taken between 2000 and 2007 with uves at the vlt a companion was detected through rv variability with a semiamplitude of 16 kms a kepler fit to the data yields an orbital period of the companion of 1590 days and an eccentricity of e049 a companion minimum mass m2sin i between 16 and 20 jupiter masses is derived when using modeldependent mass estimates for the primary the mass ratio m2m1 might be as small as 02 and with a probability of 87 it is less than 04 chaha8 harbors most certainly the lowest mass companion detected so far in a close 1 au orbit around a brown dwarf or very lowmass star from the uncertainty in the orbit solution it cannot completely be ruled out that the companion has a mass in the planetary regime its discovery is in any case an important step towards rv planet detections around bds further chaha8 is the fourth known spectroscopic brown dwarf or very lowmass binary system with an rv orbit solution and the second known very young one
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710.2438
Stability and leptogenesis in left-right symmetric seesaw models
In left-right symmetric seesaw models an eight-fold degeneracy among the right-handed neutrino mass matrices is known to exist. We use stability and viability of leptogenesis as criteria in order to discriminate among the degenerate solutions and to partially lift the eight-fold degeneracy.
hep-ph
in leftright symmetric seesaw models an eightfold degeneracy among the righthanded neutrino mass matrices is known to exist we use stability and viability of leptogenesis as criteria in order to discriminate among the degenerate solutions and to partially lift the eightfold degeneracy
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710.2439
Ab initio molecular and solid state studies of Fe$^{II}$ spin cross-over system [Fe(btz)$_2$(NCS)$_2$
Ab initio computations within the density functional theory are reported for the spin cross-over complex, [Fe(btz)$_{2}$(NCS)$_{2}$], where 3d$^6$ Fe$^{II}$ is characterized by High Spin (HS t$_{2g}^4$, e$_g^2$) and Low Spin (LS t$_{2g}^6$, e$_g^0$) states. Results of infra red and Raman spectra for the isolated molecule are complemented for the crystalline solid with a full account of the electronic band structure properties: the density of states assessing the crystal field effects and the chemical bonding assigning a specific role to the Fe-N interaction within the coordination sphere of Fe$^{II}$.
cond-mat.soft cond-mat.mtrl-sci
ab initio computations within the density functional theory are reported for the spin crossover complex febtz_2ncs_2 where 3d6 feii is characterized by high spin hs t_2g4 e_g2 and low spin ls t_2g6 e_g0 states results of infra red and raman spectra for the isolated molecule are complemented for the crystalline solid with a full account of the electronic band structure properties the density of states assessing the crystal field effects and the chemical bonding assigning a specific role to the fen interaction within the coordination sphere of feii
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710.244
Study of the electron trigger efficiency of the CMS Experiment using test beam data
A study of the electron identification and selection efficiency of the L1 Trigger algorithm has been performed using the combined ECAL/HCAL test beam data. A detailed discussion of the electron isolation and its impact on the selection efficiency is presented. The L1 electron algorithm is studied for different beam energies and the results indicate that efficiencies of 98% or more can be achieved for electrons with energies between 15 and 100 GeV. The fraction of charged hadrons with energies from 3 up to 100 GeV rejected by the L1 electron trigger algorithm is estimated to be larger than 93%.
physics.ins-det
a study of the electron identification and selection efficiency of the l1 trigger algorithm has been performed using the combined ecalhcal test beam data a detailed discussion of the electron isolation and its impact on the selection efficiency is presented the l1 electron algorithm is studied for different beam energies and the results indicate that efficiencies of 98 or more can be achieved for electrons with energies between 15 and 100 gev the fraction of charged hadrons with energies from 3 up to 100 gev rejected by the l1 electron trigger algorithm is estimated to be larger than 93
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710.2441
Pion and $\rho$-meson form factors using four-point functions in N$_F$=2 QCD
Hadron wave functions and form factors can be extracted using four-point correlators. Stochastic techniques are used to estimate the all to all propagators, which are required for the exact calculation of four-point functions. We apply the so called one-end trick to evaluate meson four-point functions. We demonstrate the effectiveness of the technique in the case of the pion and the $\rho$-meson where we extract their charge distribution, as well as the form factors.
hep-lat
hadron wave functions and form factors can be extracted using fourpoint correlators stochastic techniques are used to estimate the all to all propagators which are required for the exact calculation of fourpoint functions we apply the so called oneend trick to evaluate meson fourpoint functions we demonstrate the effectiveness of the technique in the case of the pion and the rhomeson where we extract their charge distribution as well as the form factors
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710.2442
QCD on the Cell Broadband Engine
We evaluate IBM's Enhanced Cell Broadband Engine (BE) as a possible building block of a new generation of lattice QCD machines. The Enhanced Cell BE will provide full support of double-precision floating-point arithmetics, including IEEE-compliant rounding. We have developed a performance model and applied it to relevant lattice QCD kernels. The performance estimates are supported by micro- and application-benchmarks that have been obtained on currently available Cell BE-based computers, such as IBM QS20 blades and PlayStation 3. The results are encouraging and show that this processor is an interesting option for lattice QCD applications. For a massively parallel machine on the basis of the Cell BE, an application-optimized network needs to be developed.
hep-lat
we evaluate ibms enhanced cell broadband engine be as a possible building block of a new generation of lattice qcd machines the enhanced cell be will provide full support of doubleprecision floatingpoint arithmetics including ieeecompliant rounding we have developed a performance model and applied it to relevant lattice qcd kernels the performance estimates are supported by micro and applicationbenchmarks that have been obtained on currently available cell bebased computers such as ibm qs20 blades and playstation 3 the results are encouraging and show that this processor is an interesting option for lattice qcd applications for a massively parallel machine on the basis of the cell be an applicationoptimized network needs to be developed
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710.2443
Observe matter falling into a black hole
It has been well known that in the point of view of a distant observer, all in-falling matter to a black hole (BH) will be eventually stalled and "frozen" just outside the event horizon of the BH, although an in-falling observer will see the matter falling straight through the event horizon. Thus in this "frozen star" scenario, as distant observers, we could never observe matter falling into a BH, neither could we see any "real" BH other than primordial ones, since all other BHs are believed to be formed by matter falling towards singularity. Here we first obtain the exact solution for a pressureless mass shell around a pre-existing BH. The metrics inside and interior to the shell are all different from the Schwarzschild metric of the enclosed mass. The metric interior to the shell can be transformed to the Schwarzschild metric for a slower clock which is dependent of the location and mass of the shell. Another result is that there does not exist a singularity nor event horizon in the shell. Therefore the "frozen star" scenario is incorrect. We also show that for all practical astrophysical settings the in-falling time recorded by an external observer is sufficiently short that future astrophysical instruments may be able to follow the whole process of matter falling into BHs. The distant observer could not distinguish between a "real" BH and a "frozen star", until two such objects merge together. It has been proposed that electromagnetic waves will be produced when two "frozen stars" merge together, but not true when two "real" bare BHs merge together. However gravitational waves will be produced in both cases. Thus our solution is testable by future high sensitivity astronomical observations.
astro-ph
it has been well known that in the point of view of a distant observer all infalling matter to a black hole bh will be eventually stalled and frozen just outside the event horizon of the bh although an infalling observer will see the matter falling straight through the event horizon thus in this frozen star scenario as distant observers we could never observe matter falling into a bh neither could we see any real bh other than primordial ones since all other bhs are believed to be formed by matter falling towards singularity here we first obtain the exact solution for a pressureless mass shell around a preexisting bh the metrics inside and interior to the shell are all different from the schwarzschild metric of the enclosed mass the metric interior to the shell can be transformed to the schwarzschild metric for a slower clock which is dependent of the location and mass of the shell another result is that there does not exist a singularity nor event horizon in the shell therefore the frozen star scenario is incorrect we also show that for all practical astrophysical settings the infalling time recorded by an external observer is sufficiently short that future astrophysical instruments may be able to follow the whole process of matter falling into bhs the distant observer could not distinguish between a real bh and a frozen star until two such objects merge together it has been proposed that electromagnetic waves will be produced when two frozen stars merge together but not true when two real bare bhs merge together however gravitational waves will be produced in both cases thus our solution is testable by future high sensitivity astronomical observations
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710.2444
Determining QCD Low-Energy Couplings from lattice simulations
Different strategies for the computation of QCD low-energy couplings by matching lattice QCD with the chiral effective theory are reviewed. After recalling the main features of the chiral effective theory in the epsilon- and p- regimes, the current status of the determination of leading order (Sigma, F) and next-to-leading order (l_i, L_i) low-energy constants is summarised, focusing in particular on recent results obtained with N_f=2 and N_f=2+1 simulations.
hep-lat hep-ph
different strategies for the computation of qcd lowenergy couplings by matching lattice qcd with the chiral effective theory are reviewed after recalling the main features of the chiral effective theory in the epsilon and p regimes the current status of the determination of leading order sigma f and nexttoleading order l_i l_i lowenergy constants is summarised focusing in particular on recent results obtained with n_f2 and n_f21 simulations
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710.2445
Magnetization of Color-Flavor Locked Matter
We show that the magnetization in color-flavor locked superconductors can be so strong that homogeneous quark matter becomes metastable for a wide range of magnetic field values. This indicates that magnetic domains or other type of magnetic inhomogeneities can be present in the quark cores of magnetars.
hep-ph
we show that the magnetization in colorflavor locked superconductors can be so strong that homogeneous quark matter becomes metastable for a wide range of magnetic field values this indicates that magnetic domains or other type of magnetic inhomogeneities can be present in the quark cores of magnetars
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710.2446
The structure of verbal sequences analyzed with unsupervised learning techniques
Data mining allows the exploration of sequences of phenomena, whereas one usually tends to focus on isolated phenomena or on the relation between two phenomena. It offers invaluable tools for theoretical analyses and exploration of the structure of sentences, texts, dialogues, and speech. We report here the results of an attempt at using it for inspecting sequences of verbs from French accounts of road accidents. This analysis comes from an original approach of unsupervised training allowing the discovery of the structure of sequential data. The entries of the analyzer were only made of the verbs appearing in the sentences. It provided a classification of the links between two successive verbs into four distinct clusters, allowing thus text segmentation. We give here an interpretation of these clusters by applying a statistical analysis to independent semantic annotations.
cs.CL cs.AI cs.LG
data mining allows the exploration of sequences of phenomena whereas one usually tends to focus on isolated phenomena or on the relation between two phenomena it offers invaluable tools for theoretical analyses and exploration of the structure of sentences texts dialogues and speech we report here the results of an attempt at using it for inspecting sequences of verbs from french accounts of road accidents this analysis comes from an original approach of unsupervised training allowing the discovery of the structure of sequential data the entries of the analyzer were only made of the verbs appearing in the sentences it provided a classification of the links between two successive verbs into four distinct clusters allowing thus text segmentation we give here an interpretation of these clusters by applying a statistical analysis to independent semantic annotations
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710.2447
Enhanced visibility of graphene: effect of one-dimensional photonic crystal
We investigate theoretically the light reflectance of a graphene layer prepared on the top of one-dimensional Si/SiO2 photonic crystal (1DPC). It is shown that the visibility of the graphene layers is enhanced greatly when 1DPC is added, and the visibility can be tuned by changing the incident angle and light wavelengths. This phenomenon is caused by the absorption of the graphene layer and the enhanced reflectance of the 1DPC.
cond-mat.mtrl-sci
we investigate theoretically the light reflectance of a graphene layer prepared on the top of onedimensional sisio2 photonic crystal 1dpc it is shown that the visibility of the graphene layers is enhanced greatly when 1dpc is added and the visibility can be tuned by changing the incident angle and light wavelengths this phenomenon is caused by the absorption of the graphene layer and the enhanced reflectance of the 1dpc
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710.2448
PARNI for importance sampling and density estimation
We present an aid for importance sampling in Monte Carlo integration, which is of the general-purpose type in the sense that it in principle deals with any quadratically integrable integrand on a unit hyper-cube of arbitrary dimension. In contrast to most existing systems of this type, it does not ask for the integrand as an input variable, but provides a number of routines which can be plugged into a given Monte Carlo program in order to improve its efficiency "on the fly" while running. Due to the nature of its design, it can also be used for density estimation, i.e., for the analysis of data points coming from an external source.
hep-ph
we present an aid for importance sampling in monte carlo integration which is of the generalpurpose type in the sense that it in principle deals with any quadratically integrable integrand on a unit hypercube of arbitrary dimension in contrast to most existing systems of this type it does not ask for the integrand as an input variable but provides a number of routines which can be plugged into a given monte carlo program in order to improve its efficiency on the fly while running due to the nature of its design it can also be used for density estimation ie for the analysis of data points coming from an external source
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710.2449
Statistical substantiation of introduction of the distributions containing lifetime as thermodynamic parameter
By means of an inequality of the information and parametrization of family of distributions of the probabilities, supposing an effective estimation, introduction of the distributions containing time of the first achievement of a level as internal thermodynamic parameter ground.
physics.data-an
by means of an inequality of the information and parametrization of family of distributions of the probabilities supposing an effective estimation introduction of the distributions containing time of the first achievement of a level as internal thermodynamic parameter ground
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710.245
Transient Crossing of Phantom divide line $w_{\Lambda}=-1$ under Gauss-Bonnet interaction
Smooth double crossing of the phantom barrier $w_{\Lambda} = -1$ has been found possible in cosmological model with Gauss-Bonnet-scalar interaction, in the presence of background cold dark matter. Such crossing has been observed to be a sufficiently late time phenomena and independent of the sign of Gauss-Bonnet-scalar interaction. The luminosity distance versus redshift curve shows a perfect fit with the $\Lambda CDM$ model up to $z=3.5$.
astro-ph
smooth double crossing of the phantom barrier w_lambda 1 has been found possible in cosmological model with gaussbonnetscalar interaction in the presence of background cold dark matter such crossing has been observed to be a sufficiently late time phenomena and independent of the sign of gaussbonnetscalar interaction the luminosity distance versus redshift curve shows a perfect fit with the lambda cdm model up to z35
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710.2451
Reionization: Characteristic Scales, Topology and Observability
Recently the numerical simulations of the process of reionization of the universe at z>6 have made a qualitative leap forward, reaching sufficient sizes and dynamic range to determine the characteristic scales of this process. This allowed making the first realistic predictions for a variety of observational signatures. We discuss recent results from large-scale radiative transfer and structure formation simulations on the observability of high-redshift Ly-alpha sources. We also briefly discuss the dependence of the characteristic scales and topology of the ionized and neutral patches on the reionization parameters.
astro-ph
recently the numerical simulations of the process of reionization of the universe at z6 have made a qualitative leap forward reaching sufficient sizes and dynamic range to determine the characteristic scales of this process this allowed making the first realistic predictions for a variety of observational signatures we discuss recent results from largescale radiative transfer and structure formation simulations on the observability of highredshift lyalpha sources we also briefly discuss the dependence of the characteristic scales and topology of the ionized and neutral patches on the reionization parameters
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710.2452
EG And: FUSE and HST/STIS Monitoring of an Eclipsing Symbiotic Binary
We present highlights and an overview of 20 FUSE and HST/STIS observations of the bright symbiotic binary EG And. The main motivation behind this work is to obtain spatially-resolved information on an evolved giant star in order to understand the mass-loss processes at work in these objects. The system consists of a low-luminosity white dwarf and a mass-losing, non-dusty M2 giant. The ultraviolet observations follow the white dwarf continuum through periodic gradual occultations by the wind and chromosphere of the giant, providing a unique diagnosis of the circumstellar gas in absorption. Unocculted spectra display high ionization features, such as the OVI resonance doublet which is present as a variable (hourly time-scales), broad wind profile, which diagnose the hot gas close to the dwarf component. Spectra observed at stages of partial occultation display a host of low-ionization, narrow, absorption lines, with transitions observed from lower energy levels up to ~5eV above ground. This absorption is due to chromospheric/wind material, with most lines due to transitions of SiII, PII, NI, FeII and NiII, as well as heavily damped HI Lyman series features. No molecular features are observed in the wind acceleration region despite the sensitivity of FUSE to molecular hydrogen. From analysis of the ultraviolet dataset, as well as optical data, we find that the dwarf radiation does not dominate the wind acceleration region of the giant, and that observed thermal and dynamic wind properties are most likely representative of isolated red giants.
astro-ph
we present highlights and an overview of 20 fuse and hststis observations of the bright symbiotic binary eg and the main motivation behind this work is to obtain spatiallyresolved information on an evolved giant star in order to understand the massloss processes at work in these objects the system consists of a lowluminosity white dwarf and a masslosing nondusty m2 giant the ultraviolet observations follow the white dwarf continuum through periodic gradual occultations by the wind and chromosphere of the giant providing a unique diagnosis of the circumstellar gas in absorption unocculted spectra display high ionization features such as the ovi resonance doublet which is present as a variable hourly timescales broad wind profile which diagnose the hot gas close to the dwarf component spectra observed at stages of partial occultation display a host of lowionization narrow absorption lines with transitions observed from lower energy levels up to 5ev above ground this absorption is due to chromosphericwind material with most lines due to transitions of siii pii ni feii and niii as well as heavily damped hi lyman series features no molecular features are observed in the wind acceleration region despite the sensitivity of fuse to molecular hydrogen from analysis of the ultraviolet dataset as well as optical data we find that the dwarf radiation does not dominate the wind acceleration region of the giant and that observed thermal and dynamic wind properties are most likely representative of isolated red giants
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