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711.4908
Zeeman split lines in CP stars: a discovery of low-contrast fields in slow rotators?
We show that high-resolution observations of resolved Zeeman split lines can be used to obtain new constraints on the stellar magnetic field geometry. In particular, the contrast of the field strength distribution over the stellar surface can be deduced from the differential measurement of the second moment of the pi and sigma Zeeman components. Our analysis of the triplet lines in slowly rotating cool magnetic CP stars uncovers a surprisingly homogeneous field structure, inconsistent with any low-order multipolar geometry.
astro-ph
we show that highresolution observations of resolved zeeman split lines can be used to obtain new constraints on the stellar magnetic field geometry in particular the contrast of the field strength distribution over the stellar surface can be deduced from the differential measurement of the second moment of the pi and sigma zeeman components our analysis of the triplet lines in slowly rotating cool magnetic cp stars uncovers a surprisingly homogeneous field structure inconsistent with any loworder multipolar geometry
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711.4909
Detecting very-high-frequency relic gravitational waves by electromagnetic wave polarizations in a waveguide
The polarization vector (PV) of an electromagnetic wave (EW) will experience a rotation in a region of spacetime perturbed by gravitational waves (GWs). Based on this idea, Cruise's group has built an annular waveguide to detect GWs. We give detailed calculations of the rotations of the polarization vector of an EW caused by incident GWs from various directions and in various polarization states, and then analyze the accumulative effects on the polarization vector when the EW passes n cycles along the annular waveguide. We reexamine the feasibility and limitation of this method to detect GWs of high frequency around 100 MHz, in particular, the relic gravitational waves (RGWs). By comparing the spectrum of RGWs in the accelerating universe with the detector sensitivity of the current waveguide, it is found that the amplitude of the RGWs is too low to be detected by the waveguide detectors currently running. Possible ways of improvements on detection are discussed also.
gr-qc
the polarization vector pv of an electromagnetic wave ew will experience a rotation in a region of spacetime perturbed by gravitational waves gws based on this idea cruises group has built an annular waveguide to detect gws we give detailed calculations of the rotations of the polarization vector of an ew caused by incident gws from various directions and in various polarization states and then analyze the accumulative effects on the polarization vector when the ew passes n cycles along the annular waveguide we reexamine the feasibility and limitation of this method to detect gws of high frequency around 100 mhz in particular the relic gravitational waves rgws by comparing the spectrum of rgws in the accelerating universe with the detector sensitivity of the current waveguide it is found that the amplitude of the rgws is too low to be detected by the waveguide detectors currently running possible ways of improvements on detection are discussed also
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711.491
A Non-linear Generalization of Singular Value Decomposition and its Application to Cryptanalysis
Singular Value Decomposition (SVD) is a powerful tool in linear algebra.We propose an extension of SVD for both the qualitative detection and quantitative determination of nonlinearity in a time series. The paper illustrates nonlinear SVD with the help of data generated from nonlinear maps and flows (differential equations).
nlin.CD
singular value decomposition svd is a powerful tool in linear algebrawe propose an extension of svd for both the qualitative detection and quantitative determination of nonlinearity in a time series the paper illustrates nonlinear svd with the help of data generated from nonlinear maps and flows differential equations
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711.4911
Composite bosons and quasiparticles in a number conserving approach
I recently proposed a method of bosonization valid for systems of an even number of fermions whose partition function is dominated at low energy by bosonic composites. This method respects all symmetries, in particular fermion number conservation. I extend it to treat odd systems and excitations involving unpaired fermions.
nucl-th
i recently proposed a method of bosonization valid for systems of an even number of fermions whose partition function is dominated at low energy by bosonic composites this method respects all symmetries in particular fermion number conservation i extend it to treat odd systems and excitations involving unpaired fermions
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711.4912
Massive Star Formation
This chapter reviews progress in the field of massive star formation. It focuses on evidence for accretion and current models that invoke high accretion rates. In particular it is noted that high accretion rates will cause the massive young stellar object to have a radius much larger than its eventual main sequence radius throughout much of the accretion phase. This results in low effective temperatures which may provide the explanation as to why luminous young stellar objects do not ionized their surroundings to form ultra-compact H II regions. The transition to the ultra-compact H II region phase would then be associated with the termination of the high accretion rate phase. Objects thought to be in a transition phase are discussed and diagnostic diagrams to distinguish between massive young stellar objects and ultra-compact H II regions in terms of line widths and radio luminosity are presented.
astro-ph
this chapter reviews progress in the field of massive star formation it focuses on evidence for accretion and current models that invoke high accretion rates in particular it is noted that high accretion rates will cause the massive young stellar object to have a radius much larger than its eventual main sequence radius throughout much of the accretion phase this results in low effective temperatures which may provide the explanation as to why luminous young stellar objects do not ionized their surroundings to form ultracompact h ii regions the transition to the ultracompact h ii region phase would then be associated with the termination of the high accretion rate phase objects thought to be in a transition phase are discussed and diagnostic diagrams to distinguish between massive young stellar objects and ultracompact h ii regions in terms of line widths and radio luminosity are presented
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711.4913
Gate-dependent tunneling-induced level shifts observed in carbon nanotube quantum dots
We have studied electron transport in clean single-walled carbon nanotube quantum dots. Because of the large number of Coulomb blockade diamonds simultaneously showing both shell structure and Kondo effect, we are able to perform a detailed analysis of tunneling renormalization effects. Thus determining the environment induced level shifts of this artificial atom. In shells where only one of the two orbitals is coupled strongly, we observe a marked asymmetric gate-dependence of the inelastic cotunneling lines together with a systematic gate dependence of the size (and shape) of the Coulomb diamonds. These effects are all given a simple explanation in terms of second-order perturbation theory in the tunnel coupling.
cond-mat.mes-hall
we have studied electron transport in clean singlewalled carbon nanotube quantum dots because of the large number of coulomb blockade diamonds simultaneously showing both shell structure and kondo effect we are able to perform a detailed analysis of tunneling renormalization effects thus determining the environment induced level shifts of this artificial atom in shells where only one of the two orbitals is coupled strongly we observe a marked asymmetric gatedependence of the inelastic cotunneling lines together with a systematic gate dependence of the size and shape of the coulomb diamonds these effects are all given a simple explanation in terms of secondorder perturbation theory in the tunnel coupling
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711.4914
Use of Complex Lie Symmetries for Linearization of Systems of Differential Equations - I: Ordinary Differential Equations
The Lie linearizability criteria are extended to complex functions for complex ordinary differential equations. The linearizability of complex ordinary differential equations is used to study the linearizability of corresponding systems of two real ordinary differential equations. The transformations that map a system of two nonlinear ordinary differential equations into systems of linear ordinary differential equations are obtained from complex transformations. Invariant criteria for linearization are given for second order complex ordinary differential equations in terms of the coefficients of the equations, as well as the corresponding real system, which provide procedures for writing down the solutions of the equations. Illustrative examples are given and discussed.
math.CA
the lie linearizability criteria are extended to complex functions for complex ordinary differential equations the linearizability of complex ordinary differential equations is used to study the linearizability of corresponding systems of two real ordinary differential equations the transformations that map a system of two nonlinear ordinary differential equations into systems of linear ordinary differential equations are obtained from complex transformations invariant criteria for linearization are given for second order complex ordinary differential equations in terms of the coefficients of the equations as well as the corresponding real system which provide procedures for writing down the solutions of the equations illustrative examples are given and discussed
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711.4915
Classical and quantum integrability in 3D systems
In this contribution, we discuss three situations in which complete integrability of a three dimensional classical system and its quantum version can be achieved under some conditions. The former is a system with axial symmetry. In the second, we discuss a three dimensional system without spatial symmetry which admits separation of variables if we use ellipsoidal coordinates. In both cases, and as a condition for integrability, certain conditions arise in the integrals of motion. Finally, we study integrability in the three dimensional sphere and a particular case associated with the Kepler problem in $S^3$.
math-ph math.MP
in this contribution we discuss three situations in which complete integrability of a three dimensional classical system and its quantum version can be achieved under some conditions the former is a system with axial symmetry in the second we discuss a three dimensional system without spatial symmetry which admits separation of variables if we use ellipsoidal coordinates in both cases and as a condition for integrability certain conditions arise in the integrals of motion finally we study integrability in the three dimensional sphere and a particular case associated with the kepler problem in s3
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711.4916
Variable stars in the field of open cluster NGC 6939
The results of CCD photometric survey performed with the 90/180 cm Schmidt-Cassegrain Telescope of the Nicolaus Copernicus University Astronomical Observatory in Piwnice (Poland) and the 70/172 cm Schmidt Telescope of the National Astronomical Observatory (NAO) at Rozhen (Bulgaria) of the field of 1 Gyr old open cluster NGC 6939 are presented. Twenty two variable stars were detected, four of them previously known. Four eclipsing systems (3 detached and 1 contact binary) were found to be members of the cluster. Analysis of the brightness of the contact binary V20 strongly supports the distance to the cluster of 1.74 +/- 0.20 kpc. The small population of contact binaries in NGC 6939 confirms also the relatively young age of the cluster.
astro-ph
the results of ccd photometric survey performed with the 90180 cm schmidtcassegrain telescope of the nicolaus copernicus university astronomical observatory in piwnice poland and the 70172 cm schmidt telescope of the national astronomical observatory nao at rozhen bulgaria of the field of 1 gyr old open cluster ngc 6939 are presented twenty two variable stars were detected four of them previously known four eclipsing systems 3 detached and 1 contact binary were found to be members of the cluster analysis of the brightness of the contact binary v20 strongly supports the distance to the cluster of 174 020 kpc the small population of contact binaries in ngc 6939 confirms also the relatively young age of the cluster
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711.4917
Massive gravitational waves from the R^2 theory of gravity: production and response of interferometers
We show that from the R^{2} high order gravity theory it is possible to produce, in the linearized approch, particles which can be seen like massive modes of gravitational waves (GWs). The presence of the mass generates a longitudinal force in addition of the transverse one which is proper of the massless gravitational waves and the response an interferometer to the effect is computed. This could be, in principle, important to discriminate among the gravity theories. The presence of the mass could also have important applications in cosmology because the fact that gravitational waves can have mass could give a contribution to the dark matter of the Universe.
gr-qc
we show that from the r2 high order gravity theory it is possible to produce in the linearized approch particles which can be seen like massive modes of gravitational waves gws the presence of the mass generates a longitudinal force in addition of the transverse one which is proper of the massless gravitational waves and the response an interferometer to the effect is computed this could be in principle important to discriminate among the gravity theories the presence of the mass could also have important applications in cosmology because the fact that gravitational waves can have mass could give a contribution to the dark matter of the universe
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711.4918
Microscopic heat from the energetics of stochastic phenomena
The energetics of the stochastic process has shown the balance of energy on the mesoscopic level. The heat and the energy defined there are, however, generally different from their macroscopic counterpart. We show that this discrepancy can be removed by adding to these quantities the reversible heat associated with the mesoscopic free energy.
cond-mat.stat-mech
the energetics of the stochastic process has shown the balance of energy on the mesoscopic level the heat and the energy defined there are however generally different from their macroscopic counterpart we show that this discrepancy can be removed by adding to these quantities the reversible heat associated with the mesoscopic free energy
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711.4919
Quantum Wire Hybridized with a Single-Level Impurity
We have studied low-temperature properties of interacting electrons in a one-dimensional quantum wire (Luttinger liquid) side-hybridized with a single-level impurity. The hybridization induces a back-scattering of electrons in the wire which strongly affects its low energy properties. Using a one-loop renormalization group approach valid for a weak electron-electron interaction, we have calculated a transmission coefficient through the wire, $\mathcal{T}(\varepsilon)$, and a local density of states, $\nu(\varepsilon)$ at low energies $\varepsilon $. In particular, we have found that the antiresonance in $\mathcal{T}(\varepsilon)$ has a generalized Breit-Wigner shape with the effective width $\Gamma(\varepsilon)$ which diverges at the Fermi level.
cond-mat.str-el
we have studied lowtemperature properties of interacting electrons in a onedimensional quantum wire luttinger liquid sidehybridized with a singlelevel impurity the hybridization induces a backscattering of electrons in the wire which strongly affects its low energy properties using a oneloop renormalization group approach valid for a weak electronelectron interaction we have calculated a transmission coefficient through the wire mathcaltvarepsilon and a local density of states nuvarepsilon at low energies varepsilon in particular we have found that the antiresonance in mathcaltvarepsilon has a generalized breitwigner shape with the effective width gammavarepsilon which diverges at the fermi level
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711.492
State selective differential cross sections for single and double electron capture in $He\sp{1,2+}-He$ and $p-He$ collisons
Using the COLTRIMStechnique, scattering angle differential cross sections for single and double electron capture in collisions of protons and $He\sp{1,2+}$ projectiles with helium atoms for incident energies of $60-630 keV/u$ are measured. We also report new theoretical results obtained by means of four-body one-channel distorted wave models (CDW-BFS, CDW-BIS and BDW), and find mixed agreement with the measured data.
physics.atom-ph
using the coltrimstechnique scattering angle differential cross sections for single and double electron capture in collisions of protons and hesp12 projectiles with helium atoms for incident energies of 60630 kevu are measured we also report new theoretical results obtained by means of fourbody onechannel distorted wave models cdwbfs cdwbis and bdw and find mixed agreement with the measured data
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711.4921
Use of Complex Lie Symmetries for Linearization of Systems of Differential Equations - II: Partial Differential Equations
The linearization of complex ordinary differential equations is studied by extending Lie's criteria for linearizability to complex functions of complex variables. It is shown that the linearization of complex ordinary differential equations implies the linearizability of systems of partial differential equations corresponding to those complex ordinary differential equations. The invertible complex transformations can be used to obtain invertible real transformations that map a system of nonlinear partial differential equations into a system of linear partial differential equation. Explicit invariant criteria are given that provide procedures for writing down the solutions of the linearized equations. A few non-trivial examples are mentioned.
math.CA
the linearization of complex ordinary differential equations is studied by extending lies criteria for linearizability to complex functions of complex variables it is shown that the linearization of complex ordinary differential equations implies the linearizability of systems of partial differential equations corresponding to those complex ordinary differential equations the invertible complex transformations can be used to obtain invertible real transformations that map a system of nonlinear partial differential equations into a system of linear partial differential equation explicit invariant criteria are given that provide procedures for writing down the solutions of the linearized equations a few nontrivial examples are mentioned
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711.4922
Evolution of asymptotic giant branch stars II. Optical to far-infrared isochrones with improved TP-AGB models
We present a large set of theoretical isochrones, whose distinctive features mostly reside on the greatly improved treatment of the thermally pulsing asymptotic giant branch (TP-AGB) phase. Essentially, we have coupled the TP-AGB tracks described in Paper I, at their stages of pre-flash quiescent H-shell burning, with the evolutionary tracks for the previous evolutionary phases from Girardi et al. (2000). Theoretical isochrones for any intermediate value of age and metallicity are then derived by interpolation in the grids. We take care that the isochrones keep, to a good level of detail, the several peculiarities present in these TP-AGB tracks. Theoretical isochrones are then converted to about 20 different photometric systems -- including traditional ground-based systems, and those of recent major wide-field surveys such as SDSS, OGLE, DENIS, 2MASS, UKIDSS, etc., -- by means of synthetic photometry applied to an updated library of stellar spectra, suitably extended to include C-type stars. Finally, we correct the predicted photometry by the effect of circumstellar dust during the mass-losing stages of the AGB evolution, which allows us to improve the results for the optical-to-infrared systems, and to simulate mid- and far-IR systems such as those of Spitzer and AKARI. Access to the data is provided both via a web repository of static tables (http://stev.oapd.inaf.it/dustyAGB07 and CDS), and via an interactive web interface (http://stev.oapd.inaf.it/cmd) that provides tables for any intermediate value of age and metallicity, for several photometric systems, and for different choices of dust properties.
astro-ph
we present a large set of theoretical isochrones whose distinctive features mostly reside on the greatly improved treatment of the thermally pulsing asymptotic giant branch tpagb phase essentially we have coupled the tpagb tracks described in paper i at their stages of preflash quiescent hshell burning with the evolutionary tracks for the previous evolutionary phases from girardi et al 2000 theoretical isochrones for any intermediate value of age and metallicity are then derived by interpolation in the grids we take care that the isochrones keep to a good level of detail the several peculiarities present in these tpagb tracks theoretical isochrones are then converted to about 20 different photometric systems including traditional groundbased systems and those of recent major widefield surveys such as sdss ogle denis 2mass ukidss etc by means of synthetic photometry applied to an updated library of stellar spectra suitably extended to include ctype stars finally we correct the predicted photometry by the effect of circumstellar dust during the masslosing stages of the agb evolution which allows us to improve the results for the opticaltoinfrared systems and to simulate mid and farir systems such as those of spitzer and akari access to the data is provided both via a web repository of static tables httpstevoapdinafitdustyagb07 and cds and via an interactive web interface httpstevoapdinafitcmd that provides tables for any intermediate value of age and metallicity for several photometric systems and for different choices of dust properties
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711.4923
A search of very low amplitude magnetoacoustic pulsations with HARPS
We have obtained time-resolved spectroscopic observations for a sample of 10 cool Ap stars using the ultra-stable spectrograph HARPS at the ESO 3.6-m telescope. The aim of our study was to search for low-amplitude oscillations in Ap stars with no or inconclusive evidence of pulsational variability. Here we report initial results of our investigation. We confirm the presence of ~16-min period pulsations in beta CrB (HD 137909) and demonstrate multiperiodic character of oscillations in this star. Furthermore, we discovered very low amplitude 9-min pulsations in HD 75445 - an object spectroscopically very similar to known roAp stars.
astro-ph
we have obtained timeresolved spectroscopic observations for a sample of 10 cool ap stars using the ultrastable spectrograph harps at the eso 36m telescope the aim of our study was to search for lowamplitude oscillations in ap stars with no or inconclusive evidence of pulsational variability here we report initial results of our investigation we confirm the presence of 16min period pulsations in beta crb hd 137909 and demonstrate multiperiodic character of oscillations in this star furthermore we discovered very low amplitude 9min pulsations in hd 75445 an object spectroscopically very similar to known roap stars
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711.4924
Nonuniform Bribery
We study the concept of bribery in the situation where voters are willing to change their votes as we ask them, but where their prices depend on the nature of the change we request. Our model is an extension of the one of Faliszewski et al. [FHH06], where each voter has a single price for any change we may ask for. We show polynomial-time algorithms for our version of bribery for a broad range of voting protocols, including plurality, veto, approval, and utility based voting. In addition to our polynomial-time algorithms we provide NP-completeness results for a couple of our nonuniform bribery problems for weighted voters, and a couple of approximation algorithms for NP-complete bribery problems defined in [FHH06] (in particular, an FPTAS for plurality-weighted-$bribery problem).
cs.GT cs.CC cs.MA
we study the concept of bribery in the situation where voters are willing to change their votes as we ask them but where their prices depend on the nature of the change we request our model is an extension of the one of faliszewski et al fhh06 where each voter has a single price for any change we may ask for we show polynomialtime algorithms for our version of bribery for a broad range of voting protocols including plurality veto approval and utility based voting in addition to our polynomialtime algorithms we provide npcompleteness results for a couple of our nonuniform bribery problems for weighted voters and a couple of approximation algorithms for npcomplete bribery problems defined in fhh06 in particular an fptas for pluralityweightedbribery problem
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711.4925
Improved Berezin-Li-Yau inequalities with a remainder term
We give an improvement of sharp Berezin type bounds on the Riesz means $\sum_k(\Lambda-\lambda_k)_+^\sigma$ of the eigenvalues $\lambda_k$ of the Dirichlet Laplacian in a domain if $\sigma\geq 3/2$. It contains a correction term of the order of the standard second term in the Weyl asymptotics. The result is based on an application of sharp Lieb-Thirring inequalities with operator valued potential to spectral estimates of the Dirichlet Laplacian in domains.
math.SP math-ph math.MP
we give an improvement of sharp berezin type bounds on the riesz means sum_klambdalambda_k_sigma of the eigenvalues lambda_k of the dirichlet laplacian in a domain if sigmageq 32 it contains a correction term of the order of the standard second term in the weyl asymptotics the result is based on an application of sharp liebthirring inequalities with operator valued potential to spectral estimates of the dirichlet laplacian in domains
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711.4926
Absolute frequency measurement of the magnesium intercombination transition $^1S_0 \to ^3P_1$
We report on a frequency measurement of the $(3s^2)^1S_0\to(3s3p)^3P_1$ clock transition of $^{24}$Mg on a thermal atomic beam. The intercombination transition has been referenced to a portable primary Cs frequency standard with the help of a femtosecond fiber laser frequency comb. The achieved uncertainty is $2.5\times10^{-12}$ which corresponds to an increase in accuracy of six orders of magnitude compared to previous results. The measured frequency value permits the calculation of several other optical transitions from $^1S_0$ to the $^3P_J$-level system for $^{24}$Mg, $^{25}$Mg and $^{26}$Mg. We describe in detail the components of our optical frequency standard like the stabilized spectroscopy laser, the atomic beam apparatus used for Ramsey-Bord\'e interferometry and the frequency comb generator and discuss the uncertainty contributions to our measurement including the first and second order Doppler effect. An upper limit of $3\times10^{-13}$ in one second for the short term instability of our optical frequency standard was determined by comparison with a GPS disciplined quartz oscillator.
physics.atom-ph
we report on a frequency measurement of the 3s21s_0to3s3p3p_1 clock transition of 24mg on a thermal atomic beam the intercombination transition has been referenced to a portable primary cs frequency standard with the help of a femtosecond fiber laser frequency comb the achieved uncertainty is 25times1012 which corresponds to an increase in accuracy of six orders of magnitude compared to previous results the measured frequency value permits the calculation of several other optical transitions from 1s_0 to the 3p_jlevel system for 24mg 25mg and 26mg we describe in detail the components of our optical frequency standard like the stabilized spectroscopy laser the atomic beam apparatus used for ramseyborde interferometry and the frequency comb generator and discuss the uncertainty contributions to our measurement including the first and second order doppler effect an upper limit of 3times1013 in one second for the short term instability of our optical frequency standard was determined by comparison with a gps disciplined quartz oscillator
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711.4927
The double pulsar: evolutionary constraints from the system geometry
The double pulsar system PSR J0737-3039A/B is a highly relativistic double neutron star (DNS) binary, with a 2.4-hour orbital period. The low mass of the second-formed NS, as well the low system eccentricity and proper motion, point to a different evolutionary scenario compared to other known DNS systems. We describe analysis of the pulse profile shape over 6 years of observations, and present the resulting constraints on the system geometry. We find the recycled pulsar in this system, PSR J0737-3039A, to have a low misalignment between its spin and orbital angular momentum axes, with a 68.3% upper limit of 6.1 degrees, assuming emission from both magnetic poles. This tight constraint lends credence to the idea that the supernova that formed the second pulsar was relatively symmetric, possibly involving electron-capture onto an O-Ne-Mg core.
astro-ph
the double pulsar system psr j07373039ab is a highly relativistic double neutron star dns binary with a 24hour orbital period the low mass of the secondformed ns as well the low system eccentricity and proper motion point to a different evolutionary scenario compared to other known dns systems we describe analysis of the pulse profile shape over 6 years of observations and present the resulting constraints on the system geometry we find the recycled pulsar in this system psr j07373039a to have a low misalignment between its spin and orbital angular momentum axes with a 683 upper limit of 61 degrees assuming emission from both magnetic poles this tight constraint lends credence to the idea that the supernova that formed the second pulsar was relatively symmetric possibly involving electroncapture onto an onemg core
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711.4928
Kaonic hydrogen versus the $K^{-}p$ low energy data
We present an exact solution to the $K^{-}$-proton bound state problem formulated in the momentum space. The 1s level characteristics of the kaonic hydrogen are computed simultaneously with the available low energy $K^{-}p$ data. In the strong interaction sector the meson-baryon interactions are described by means of an effective (chirally motivated) separable potential and its parameters are fitted to the experimental data.
hep-ph
we present an exact solution to the kproton bound state problem formulated in the momentum space the 1s level characteristics of the kaonic hydrogen are computed simultaneously with the available low energy kp data in the strong interaction sector the mesonbaryon interactions are described by means of an effective chirally motivated separable potential and its parameters are fitted to the experimental data
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711.4929
Moduli space of stable maps to projective space via GIT
We compare the Kontsevich moduli space of genus 0 stable maps to projective space with the quasi-map space when $d=3$. More precisely, we prove that when $d=3$, the obvious birational map from the quasi-map space to the moduli space of stable maps is the composition of three blow-ups followed by two blow-downs. Furthermore, we identify the blow-up/down centers explicitly in terms of the moduli spaces for lower degrees. Using this, we calculate the Betti numbers, the integral Picard group, and the rational cohomology ring. The degree two case is worked out as a warm-up.
math.AG
we compare the kontsevich moduli space of genus 0 stable maps to projective space with the quasimap space when d3 more precisely we prove that when d3 the obvious birational map from the quasimap space to the moduli space of stable maps is the composition of three blowups followed by two blowdowns furthermore we identify the blowupdown centers explicitly in terms of the moduli spaces for lower degrees using this we calculate the betti numbers the integral picard group and the rational cohomology ring the degree two case is worked out as a warmup
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711.493
On the recent paper on quark confinement by Tomboulis
We point out missing links in the recent paper by Tomboulis in which he claims a rigorous proof of quark confinement in 4D lattice gauge theory. We also discuss if it is possible to correct his proof.
hep-th hep-lat math-ph math.MP
we point out missing links in the recent paper by tomboulis in which he claims a rigorous proof of quark confinement in 4d lattice gauge theory we also discuss if it is possible to correct his proof
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711.4931
Complete characterization of weak, ultrashort near-UV pulses by spectral interferometry
We present a method for a complete characterization of a femtosecond ultraviolet pulse when a fundamental near-infrared beam is also available. Our approach relies on generation of second harmonic from the pre-characterized fundamental, which serves as a reference against which an unknown pulse is measured using spectral interference (SI). The characterization apparatus is a modified second harmonic frequency resolved optical gating setup which additionally allows for taking SI spectrum. The presented method is linear in the unknown field, simple and sensitive. We checked its accuracy using test pulses generated in a thick nonlinear crystal, demonstrating the ability to measure the phase in a broad spectral range, down to 0.1% peak spectral intensity as well as retrieving pi leaps in the spectral phase.
physics.optics
we present a method for a complete characterization of a femtosecond ultraviolet pulse when a fundamental nearinfrared beam is also available our approach relies on generation of second harmonic from the precharacterized fundamental which serves as a reference against which an unknown pulse is measured using spectral interference si the characterization apparatus is a modified second harmonic frequency resolved optical gating setup which additionally allows for taking si spectrum the presented method is linear in the unknown field simple and sensitive we checked its accuracy using test pulses generated in a thick nonlinear crystal demonstrating the ability to measure the phase in a broad spectral range down to 01 peak spectral intensity as well as retrieving pi leaps in the spectral phase
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711.4932
Non-equilibrium Phase Transitions in Ultrarelativistic Nuclear Collisions
Highly excited nuclear matter created in ultrarelativistic heavy-ion collisions possibly reaches the phase of quark deconfinement. It quickly cools down and hadronises. We explain that the process of hadronisation may likely be connected with disintegration into fragments. Observable signals of such a scenario are proposed.
nucl-th
highly excited nuclear matter created in ultrarelativistic heavyion collisions possibly reaches the phase of quark deconfinement it quickly cools down and hadronises we explain that the process of hadronisation may likely be connected with disintegration into fragments observable signals of such a scenario are proposed
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711.4933
Fast Estimator of Primordial Non-Gaussianity from Temperature and Polarization Anisotropies in the Cosmic Microwave Background II: Partial Sky Coverage and Inhomogeneous Noise
In our recent paper (Yadav et al. 2007) we described a fast cubic (bispectrum) estimator of the amplitude of primordial non-Gaussianity of local type, f_{NL}, from a combined analysis of the Cosmic Microwave Background (CMB) temperature and E-polarization observations. In this paper we generalize the estimator to deal with a partial sky coverage as well as inhomogeneous noise. Our generalized estimator is still computationally efficient, scaling as O(N^3/2) compared to the O(N^5/2) scaling of the brute force bispectrum calculation for sky maps with N pixels. Upcoming CMB experiments are expected to yield high-sensitivity temperature and E-polarization data. Our generalized estimator will allow us to optimally utilize the combined CMB temperature and E-polarization information from these realistic experiments, and to constrain primordial non-Gaussianity.
astro-ph
in our recent paper yadav et al 2007 we described a fast cubic bispectrum estimator of the amplitude of primordial nongaussianity of local type f_nl from a combined analysis of the cosmic microwave background cmb temperature and epolarization observations in this paper we generalize the estimator to deal with a partial sky coverage as well as inhomogeneous noise our generalized estimator is still computationally efficient scaling as on32 compared to the on52 scaling of the brute force bispectrum calculation for sky maps with n pixels upcoming cmb experiments are expected to yield highsensitivity temperature and epolarization data our generalized estimator will allow us to optimally utilize the combined cmb temperature and epolarization information from these realistic experiments and to constrain primordial nongaussianity
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711.4934
Moduli stabilization with Fayet-Iliopoulos uplift
In the recent years, phenomenological models of moduli stabilization were proposed, where the dynamics of the stabilization is essentially supersymmetric, whereas an O'Rafearthaigh supersymmetry breaking sector is responsible for the "uplift" of the cosmological constant to zero. We investigate the case where the uplift is provided by a Fayet-Iliopoulos sector. We find that in this case the modulus contribution to supersymmetry breaking is larger than in the previous models. A first consequence of this class of constructions is for gauginos, which are heavier compared to previous models. In some of our explicit examples, due to a non-standard gauge-mediation type negative contribution to scalars masses, the whole superpartner spectrum can be efficiently compressed at low-energy. This provides an original phenomenology testable at the LHC, in particular sleptons are generically heavier than the squarks.
hep-th hep-ph
in the recent years phenomenological models of moduli stabilization were proposed where the dynamics of the stabilization is essentially supersymmetric whereas an orafearthaigh supersymmetry breaking sector is responsible for the uplift of the cosmological constant to zero we investigate the case where the uplift is provided by a fayetiliopoulos sector we find that in this case the modulus contribution to supersymmetry breaking is larger than in the previous models a first consequence of this class of constructions is for gauginos which are heavier compared to previous models in some of our explicit examples due to a nonstandard gaugemediation type negative contribution to scalars masses the whole superpartner spectrum can be efficiently compressed at lowenergy this provides an original phenomenology testable at the lhc in particular sleptons are generically heavier than the squarks
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711.4935
Study of event-by-event fluctuations in heavy ion collisions
We propose Kolmogorov-Smirnov test as a means for recognising event-by-event fluctuations of rapidity distributions in relativistic heavy ion collisions. Such fluctuations may be induced by the spinodal decomposition of the rapidly expanding system during the 1st order quark-hadron phase transition.
nucl-th
we propose kolmogorovsmirnov test as a means for recognising eventbyevent fluctuations of rapidity distributions in relativistic heavy ion collisions such fluctuations may be induced by the spinodal decomposition of the rapidly expanding system during the 1st order quarkhadron phase transition
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711.4936
Highly sensitive and broadband carbon nanotube radio-frequency single-electron transistor
We have investigated radio-frequency single-electron transistor (RF-SET) operation of single-walled carbon nanotube quantum dots in the strong tunneling regime. At 4.2 K and carrier frequency 754.2 MHz, we reach a charge sensitivity of 2.3e-6 e/Hz^(1/2) over a bandwidth of 85 MHz. Our results indicate a gain-bandwidth product of 3.7e13 Hz^(3/2)/e, which is by one order of magnitude better than for typical RF-SETs.
cond-mat.other cond-mat.mes-hall
we have investigated radiofrequency singleelectron transistor rfset operation of singlewalled carbon nanotube quantum dots in the strong tunneling regime at 42 k and carrier frequency 7542 mhz we reach a charge sensitivity of 23e6 ehz12 over a bandwidth of 85 mhz our results indicate a gainbandwidth product of 37e13 hz32e which is by one order of magnitude better than for typical rfsets
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711.4937
Functions of Bifans in Context of Multiple Regulatory Motifs in Signaling Networks
Representation of intracellular signaling networks as directed graphs allows for the identification of regulatory motifs. Regulatory motifs are groups of nodes with the same connectivity structure, capable of processing information. The bifan motif, made of two source nodes directly cross-regulating two target nodes, is an over-represented motif in a mammalian cell signaling network and in transcriptional networks. One example of a bifan is the two MAP-kinases, p38 and JNK that phosphorylate and activate the two transcription factors ATF2 and Elk-1. We have used a system of coupled ordinary differential equations to analyze the regulatory capability of this bifan motif by itself, and when it interacts with other motifs such as positive and negative feedback loops. Our results indicate that bifans provide temporal regulation of signal propagation and act as signal sorters, filters, and synchronizers. Bifans that have OR gate configurations show rapid responses while AND gate bifans can introduce delays and allow prolongation of signal outputs. Bifans that are AND gates can filter noisy signal inputs. The p38/JNK-ATF2/Elk-1bifan synchronizes the output of activated transcription factors. Synchronization is a robust property of bifans and is exhibited even when the bifan is adjacent to a positive feedback loop. The presence of the bifan promotes the transcription and translation of the dual specificity protein phosphatase MKP-1 that inhibits p38 and JNK thus enabling a negative feedback loop. These results indicate that bifan motifs in cell signaling networks can contribute to signal processing capability both intrinsically and by enabling the functions of other regulatory motifs.
q-bio.MN q-bio.QM q-bio.SC
representation of intracellular signaling networks as directed graphs allows for the identification of regulatory motifs regulatory motifs are groups of nodes with the same connectivity structure capable of processing information the bifan motif made of two source nodes directly crossregulating two target nodes is an overrepresented motif in a mammalian cell signaling network and in transcriptional networks one example of a bifan is the two mapkinases p38 and jnk that phosphorylate and activate the two transcription factors atf2 and elk1 we have used a system of coupled ordinary differential equations to analyze the regulatory capability of this bifan motif by itself and when it interacts with other motifs such as positive and negative feedback loops our results indicate that bifans provide temporal regulation of signal propagation and act as signal sorters filters and synchronizers bifans that have or gate configurations show rapid responses while and gate bifans can introduce delays and allow prolongation of signal outputs bifans that are and gates can filter noisy signal inputs the p38jnkatf2elk1bifan synchronizes the output of activated transcription factors synchronization is a robust property of bifans and is exhibited even when the bifan is adjacent to a positive feedback loop the presence of the bifan promotes the transcription and translation of the dual specificity protein phosphatase mkp1 that inhibits p38 and jnk thus enabling a negative feedback loop these results indicate that bifan motifs in cell signaling networks can contribute to signal processing capability both intrinsically and by enabling the functions of other regulatory motifs
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711.4938
De-biasing interferometric visibilities in VLTI-AMBER data of low SNR observations
AIMS: We have found that the interferometric visibilities of VLTI-AMBER observations, extracted via the standard reduction package, are significantly biased when faint targets are concerned. The visibility biases derive from a time variable fringing effect (correlated noise) appearing on the detector. METHODS: We have developed a method to correct this bias that consists in a subtraction of the extra power due to such correlated noise, so that the real power spectrum at the spatial frequencies of the fringing artifact can be restored. RESULTS: This pre-processing procedure is implemented in a software, called AMDC and available to the community, to be run before the standard reduction package. Results obtained on simulated and real observations are presented and discussed.
astro-ph
aims we have found that the interferometric visibilities of vltiamber observations extracted via the standard reduction package are significantly biased when faint targets are concerned the visibility biases derive from a time variable fringing effect correlated noise appearing on the detector methods we have developed a method to correct this bias that consists in a subtraction of the extra power due to such correlated noise so that the real power spectrum at the spatial frequencies of the fringing artifact can be restored results this preprocessing procedure is implemented in a software called amdc and available to the community to be run before the standard reduction package results obtained on simulated and real observations are presented and discussed
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711.4939
Large voltage from spin pumping in magnetic tunnel junctions
We studied the response of a ferromagnet-insulator-normal metal tunnel structure under an external oscillating radio frequency (R.F.) magnetic field. The D. C. voltage across the junction is calculated and is found not to decrease despite the high resistance of the junction; instead, it is of the order of $\mu V$ to $100\mu V$, much larger than the experimentally observed value (100 nano-V) in the "strong coupled" ohmic ferromagnet-normal metal bilayers. This is consistent with recent experimental results in tunnel structures, where the voltage is larger than $\mu V$s. The damping and loss of an external RF field in this structure is calculated.
cond-mat.mtrl-sci
we studied the response of a ferromagnetinsulatornormal metal tunnel structure under an external oscillating radio frequency rf magnetic field the d c voltage across the junction is calculated and is found not to decrease despite the high resistance of the junction instead it is of the order of mu v to 100mu v much larger than the experimentally observed value 100 nanov in the strong coupled ohmic ferromagnetnormal metal bilayers this is consistent with recent experimental results in tunnel structures where the voltage is larger than mu vs the damping and loss of an external rf field in this structure is calculated
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711.494
Means and Hermite Interpolation
Let $m_{2}<m_{1}$ be two given nonnegative integers with $n=m_{1}+m_{2}+1$. For suitably differentiable $f$, we let $P,Q\in \pi_{n}$ be the Hermite polynomial interpolants to $f$ which satisfy $P^{(j)}(a)=f^{(j)}(a),j=0,1,...,m_{1}$ and $P^{(j)}(b)=f^{(j)}(b),j=0,1,...,m_{2},$ $Q^{(j)}(a)=f^{(j)}(a),j=0,1,...,m_{2}$ and $Q^{(j)}(b)=f^{(j)}(b),j=0,1,...,m_{1}$. Suppose that $f\in C^{n+2}(I)$ with $f^{(n+1)}(x)\neq 0$ for $x\in (a,b)$. If $m_{1}-m_{2}$ is even, then there is a unique $x_{0},a<x_{0}<b,$ such that $P(x_{0})=Q(x_{0})$. If $m_{1}-m_{2}$ is odd, then there is a unique $x_{0},a<x_{0}<b,$ such that $f(x_{0})=\tfrac{1}{2}(P(x_{0})+Q(x_{0})) $. $x_{0}$ defines a strict, symmetric mean, which we denote by $M_{f,m_{1},m_{2}}(a,b)$. We prove various properties of these means. In particular, we show that $f(x)=x^{m_{1}+m_{2}+2}$ yields the arithmetic mean, $f(x)=x^{-1}$ yields the harmonic mean, and $f(x)=x^{(m_{1}+m_{2}+1)/2}$ yields the geometric mean.
math.CA
let m_2m_1 be two given nonnegative integers with nm_1m_21 for suitably differentiable f we let pqin pi_n be the hermite polynomial interpolants to f which satisfy pjafjaj01m_1 and pjbfjbj01m_2 qjafjaj01m_2 and qjbfjbj01m_1 suppose that fin cn2i with fn1xneq 0 for xin ab if m_1m_2 is even then there is a unique x_0ax_0b such that px_0qx_0 if m_1m_2 is odd then there is a unique x_0ax_0b such that fx_0tfrac12px_0qx_0 x_0 defines a strict symmetric mean which we denote by m_fm_1m_2ab we prove various properties of these means in particular we show that fxxm_1m_22 yields the arithmetic mean fxx1 yields the harmonic mean and fxxm_1m_212 yields the geometric mean
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711.4941
Forming an Early O-type Star Through Gas Accretion?
We present high angular resolution ($\sim$ 3$''$) and sensitive 1.3 mm continuum, cyanogen (CN) and vinyl cyanide (C$_2$H$_3$CN) line observations made with the Submillimeter Array (SMA) toward one of most highly obscured objects of the W51 IRS2 region, W51 North. We find that the CN line exhibits a pronounced inverse P-Cygni profile indicating that the molecular gas is infalling inwards this object with a mass accretion rate between 4 and 7 $\times$ 10$^{-2}$ M$_\odot$ yr$^{-1}$. The C$_2$H$_3$CN traces an east-west rotating molecular envelope that surrounds either a single obscured (proto)star with a kinematic mass of 40 M$_{\odot}$ or a small central cluster of B-type stars and that is associated with a compact high velocity bipolar outflow traced by H$_2$O masers and SiO molecular emission. We thus confirm that the W51 North region is part of the growing list of young massive star forming regions that have been associated with infalling motions and with large mass accretion rates ($\sim$ 10$^{-2}$ -- 10$^{-4}$), strengthening the evidence for massive stars forming with very high accretion rates sufficient to quench the formation of an UCHII region.
astro-ph
we present high angular resolution sim 3 and sensitive 13 mm continuum cyanogen cn and vinyl cyanide c_2h_3cn line observations made with the submillimeter array sma toward one of most highly obscured objects of the w51 irs2 region w51 north we find that the cn line exhibits a pronounced inverse pcygni profile indicating that the molecular gas is infalling inwards this object with a mass accretion rate between 4 and 7 times 102 m_odot yr1 the c_2h_3cn traces an eastwest rotating molecular envelope that surrounds either a single obscured protostar with a kinematic mass of 40 m_odot or a small central cluster of btype stars and that is associated with a compact high velocity bipolar outflow traced by h_2o masers and sio molecular emission we thus confirm that the w51 north region is part of the growing list of young massive star forming regions that have been associated with infalling motions and with large mass accretion rates sim 102 104 strengthening the evidence for massive stars forming with very high accretion rates sufficient to quench the formation of an uchii region
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711.4942
Numerical modeling of 1-D transient poroelastic waves in the low-frequency range
Propagation of transient mechanical waves in porous media is numerically investigated in 1D. The framework is the linear Biot's model with frequency-independant coefficients. The coexistence of a propagating fast wave and a diffusive slow wave makes numerical modeling tricky. A method combining three numerical tools is proposed: a fourth-order ADER scheme with time-splitting to deal with the time-marching, a space-time mesh refinement to account for the small-scale evolution of the slow wave, and an interface method to enforce the jump conditions at interfaces. Comparisons with analytical solutions confirm the validity of this approach.
physics.geo-ph math.NA
propagation of transient mechanical waves in porous media is numerically investigated in 1d the framework is the linear biots model with frequencyindependant coefficients the coexistence of a propagating fast wave and a diffusive slow wave makes numerical modeling tricky a method combining three numerical tools is proposed a fourthorder ader scheme with timesplitting to deal with the timemarching a spacetime mesh refinement to account for the smallscale evolution of the slow wave and an interface method to enforce the jump conditions at interfaces comparisons with analytical solutions confirm the validity of this approach
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711.4943
$\Lambda N$ correlations from the stopped $K^-$ reaction on ${}^4$He
We have investigated correlations of coincident $\Lambda N$ pairs from the stopped $K^-$ reaction on ${}^4$He, and clearly observed $\Lambda p$ and $\Lambda n$ branches of the two-nucleon absorption process in the $\Lambda N$ invariant mass spectra. In addition, non-mesonic reaction channels, which indicate possible exotic signals for the formation of strange multibaryon states, have been identified.
nucl-ex
we have investigated correlations of coincident lambda n pairs from the stopped k reaction on 4he and clearly observed lambda p and lambda n branches of the twonucleon absorption process in the lambda n invariant mass spectra in addition nonmesonic reaction channels which indicate possible exotic signals for the formation of strange multibaryon states have been identified
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711.4944
Development of miniaturized light endoscope-holder robot for laparoscopic surgery
PURPOSE: We have conducted experiments with an innovatively designed robot endoscope holder for laparoscopic surgery that is small and low cost. MATERIALS AND METHODS: A compact light endoscope robot (LER) that is placed on the patient's skin and can be used with the patient in the lateral or dorsal supine position was tested on cadavers and laboratory pigs in order to allow successive modifications. The current control system is based on voice recognition. The range of vision is 360 degrees with an angle of 160 degrees . Twenty-three procedures were performed. RESULTS: The tests made it possible to advance the prototype on a variety of aspects, including reliability, steadiness, ergonomics, and dimensions. The ease of installation of the robot, which takes only 5 minutes, and the easy handling made it possible for 21 of the 23 procedures to be performed without an assistant. CONCLUSION: The LER is a camera holder guided by the surgeon's voice that can eliminate the need for an assistant during laparoscopic surgery. The ease of installation and manufacture should make it an effective and inexpensive system for use on patients in the lateral and dorsal supine positions. Randomized clinical trials will soon validate a new version of this robot prior to marketing.
cs.OH
purpose we have conducted experiments with an innovatively designed robot endoscope holder for laparoscopic surgery that is small and low cost materials and methods a compact light endoscope robot ler that is placed on the patients skin and can be used with the patient in the lateral or dorsal supine position was tested on cadavers and laboratory pigs in order to allow successive modifications the current control system is based on voice recognition the range of vision is 360 degrees with an angle of 160 degrees twentythree procedures were performed results the tests made it possible to advance the prototype on a variety of aspects including reliability steadiness ergonomics and dimensions the ease of installation of the robot which takes only 5 minutes and the easy handling made it possible for 21 of the 23 procedures to be performed without an assistant conclusion the ler is a camera holder guided by the surgeons voice that can eliminate the need for an assistant during laparoscopic surgery the ease of installation and manufacture should make it an effective and inexpensive system for use on patients in the lateral and dorsal supine positions randomized clinical trials will soon validate a new version of this robot prior to marketing
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711.4945
Renormalized cluster expansion of the microfield distribution in a strongly coupled two-component plasmas
The electric microfield distribution (MFD) at an impurity ion is studied for two-component (TCP) electron-ion plasmas using molecular dynamics simulation and theoretical models. The particles are treated within classical statistical mechanics using an electron-ion Coulomb potential regularized at distances less than the de Broglie length to take into account quantum-diffraction effects. Corrections to the potential-of-mean-force exponential (PMFEX) approximation recently proposed for MFD in a strongly coupled TCP [Phys. Rev. E 72, 036403 (2005)] are obtained and discussed. This has been done by a generalization of the standard Baranger-Mozer and renormalized cluster expansion techniques originally developed for the one-component plasmas to the TCPs. The results obtained for a neutral point are compared with those from molecular dynamics simulations. It is shown that the corrections do not help to improve the PMFEX approximation for a TCP with low ionic charge Z. But starting with Z > 5 the PMFEX model is substantially improved and the agreement with numerical simulations is excellent. We have also found that with increasing coupling the PMFEX approximation becomes invalid to predict the MFD at a neutral point while its corrected version agrees satisfactory with the simulations.
physics.plasm-ph
the electric microfield distribution mfd at an impurity ion is studied for twocomponent tcp electronion plasmas using molecular dynamics simulation and theoretical models the particles are treated within classical statistical mechanics using an electronion coulomb potential regularized at distances less than the de broglie length to take into account quantumdiffraction effects corrections to the potentialofmeanforce exponential pmfex approximation recently proposed for mfd in a strongly coupled tcp phys rev e 72 036403 2005 are obtained and discussed this has been done by a generalization of the standard barangermozer and renormalized cluster expansion techniques originally developed for the onecomponent plasmas to the tcps the results obtained for a neutral point are compared with those from molecular dynamics simulations it is shown that the corrections do not help to improve the pmfex approximation for a tcp with low ionic charge z but starting with z 5 the pmfex model is substantially improved and the agreement with numerical simulations is excellent we have also found that with increasing coupling the pmfex approximation becomes invalid to predict the mfd at a neutral point while its corrected version agrees satisfactory with the simulations
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711.4946
Effective temperature of active matter
We follow the dynamics of an ensemble of interacting self-propelled motorized particles in contact with an equilibrated thermal bath. We find that the fluctuation-dissipation relation allows for the definition of an effective temperature that is compatible with the results obtained using a tracer particle as a thermometer. The effective temperature takes a value which is higher than the temperature of the bath and it is continuously controlled by the motor intensity.
cond-mat.soft cond-mat.stat-mech q-bio.CB
we follow the dynamics of an ensemble of interacting selfpropelled motorized particles in contact with an equilibrated thermal bath we find that the fluctuationdissipation relation allows for the definition of an effective temperature that is compatible with the results obtained using a tracer particle as a thermometer the effective temperature takes a value which is higher than the temperature of the bath and it is continuously controlled by the motor intensity
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711.4947
Some aspects of ultra-relativistic heavy ion collisions
In this talk, I discuss some recent results obtained in Heavy Ion Collisions and what they tell us -- or what questions they raise -- about the physics of the system of quarks and gluons formed in these collisions.
nucl-th hep-ph
in this talk i discuss some recent results obtained in heavy ion collisions and what they tell us or what questions they raise about the physics of the system of quarks and gluons formed in these collisions
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711.4948
Near-critical percolation in two dimensions
We give a self-contained and detailed presentation of Kesten's results that allow to relate critical and near-critical percolation on the triangular lattice. They constitute an important step in the derivation of the exponents describing the near-critical behavior of this model. For future use and reference, we also show how these results can be obtained in more general situations, and we state some new consequences.
math.PR
we give a selfcontained and detailed presentation of kestens results that allow to relate critical and nearcritical percolation on the triangular lattice they constitute an important step in the derivation of the exponents describing the nearcritical behavior of this model for future use and reference we also show how these results can be obtained in more general situations and we state some new consequences
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711.4949
Irreducible representations of inner quasidiagonal C*-algebras
It is shown that a separable C*-algebra is inner quasidiagonal if and only if it has a separating family of quasidiagonal irreducible representations. As a consequence, a separable C*-algebra is a strong NF algebra if and only if it is nuclear and has a separating family of quasidiagonal irreducible representations. We also obtain some permanence properties of the class of inner quasidiagonal C*-algebras.
math.OA
it is shown that a separable calgebra is inner quasidiagonal if and only if it has a separating family of quasidiagonal irreducible representations as a consequence a separable calgebra is a strong nf algebra if and only if it is nuclear and has a separating family of quasidiagonal irreducible representations we also obtain some permanence properties of the class of inner quasidiagonal calgebras
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711.495
The Ground Scalar Nonet and D Decays
A short review on light scalar mesons is performed both in experiment and theory. A naive model, constrained by D branching ratios, is derived in order to make predictions on the wave functions of the $f_0(600)$ and $a_0(980)$ mesons. This leads us to compute transition form factors between the pseudoscalar $B$ and scalar mesons.
hep-ph
a short review on light scalar mesons is performed both in experiment and theory a naive model constrained by d branching ratios is derived in order to make predictions on the wave functions of the f_0600 and a_0980 mesons this leads us to compute transition form factors between the pseudoscalar b and scalar mesons
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711.4951
The galaxy luminosity function of the Abell 496 cluster and its spatial variations
We investigate the LF in the very relaxed cluster Abell 496. Our analysis is based on deep images obtained at CFHT with MegaPrime/MegaCam in four bands (ugri) covering a 1x1 deg2 region, which is centered on the cluster Abell 496 and extends to near its virial radius. The LFs are estimated by statistically subtracting a reference field taken as the mean of the 4 Deep fields of the CFHTLS survey. Background contamination is minimized by cutting out galaxies redder than the observed Red Sequence in the g-i versus i colour-magnitude diagram. In Abell 496, the global LFs show a faint-end slope alpha=-1.55+/-0.06 and vary little with observing band. Without colour cuts, the LFs are much noisier but not significantly steeper. The faint-end slopes show a statistically significant steepening from alpha=-1.4+/-0.1 in the central region (extending to half a virial radius) to -1.8+/-0.1 in the Southern envelope of the cluster. Cosmic variance and uncertain star-galaxy separation are our main limiting factors in measuring the faint-end of the LFs. The large-scale environment of Abell 496, probed with the fairly complete 6dFGS catalogue, shows a statistically significant 36 Mpc long filament at PA=137 deg, but we do not find an enhanced LF along this axis. Our LFs do not display the large number of dwarf galaxies (alpha ~ -2) inferred by several authors, whose analyses may suffer from field contamination caused by inexistent or inadequate colour cuts. Alternatively, different clusters may have different faint-end slopes, but this is hard to reconcile with the wide range of slopes found for given clusters and for wide sets of clusters.
astro-ph
we investigate the lf in the very relaxed cluster abell 496 our analysis is based on deep images obtained at cfht with megaprimemegacam in four bands ugri covering a 1x1 deg2 region which is centered on the cluster abell 496 and extends to near its virial radius the lfs are estimated by statistically subtracting a reference field taken as the mean of the 4 deep fields of the cfhtls survey background contamination is minimized by cutting out galaxies redder than the observed red sequence in the gi versus i colourmagnitude diagram in abell 496 the global lfs show a faintend slope alpha155006 and vary little with observing band without colour cuts the lfs are much noisier but not significantly steeper the faintend slopes show a statistically significant steepening from alpha1401 in the central region extending to half a virial radius to 1801 in the southern envelope of the cluster cosmic variance and uncertain stargalaxy separation are our main limiting factors in measuring the faintend of the lfs the largescale environment of abell 496 probed with the fairly complete 6dfgs catalogue shows a statistically significant 36 mpc long filament at pa137 deg but we do not find an enhanced lf along this axis our lfs do not display the large number of dwarf galaxies alpha 2 inferred by several authors whose analyses may suffer from field contamination caused by inexistent or inadequate colour cuts alternatively different clusters may have different faintend slopes but this is hard to reconcile with the wide range of slopes found for given clusters and for wide sets of clusters
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711.4952
A Kerr interior
An exact solution of the Einstein field equations is proposed which represents a differentially rotating fluid. As this solution matches the exterior Kerr solution and reduces to the Schwarzschild interior solution by setting the rotational parameter to zero, it could serve as Kerr interior.
astro-ph gr-qc
an exact solution of the einstein field equations is proposed which represents a differentially rotating fluid as this solution matches the exterior kerr solution and reduces to the schwarzschild interior solution by setting the rotational parameter to zero it could serve as kerr interior
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711.4953
Kerr interior surfaces
A recently found interior for the Kerr metric is re-investigated by means of geometrical methods. A surface with nonholonomicity is matched to the surface of the exterior solution.
astro-ph gr-qc
a recently found interior for the kerr metric is reinvestigated by means of geometrical methods a surface with nonholonomicity is matched to the surface of the exterior solution
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711.4954
The Vacuum Fluctuation Theorem: Exact Schroedinger Equation via Nonequilibrium Thermodynamics
By assuming that a particle of energy hbar.omega is actually a dissipative system maintained in a nonequilibrium steady state by a constant throughput of energy (heat flow), the exact Schroedinger equation is derived, both for conservative and nonconservative systems. Thereby, only universal properties of oscillators and nonequilibrium thermostatting are used, such that a maximal model independence of the hypothesised sub-quantum physics is guaranteed. It is claimed that this represents the shortest derivation of the Schroedinger equation from (modern) classical physics in the literature, and the only exact one, too. Moreover, a "vacuum fluctuation theorem" is presented, with particular emphasis on possible applications for a better understanding of quantum mechanical nonlocal effects.
quant-ph cond-mat.stat-mech physics.hist-ph
by assuming that a particle of energy hbaromega is actually a dissipative system maintained in a nonequilibrium steady state by a constant throughput of energy heat flow the exact schroedinger equation is derived both for conservative and nonconservative systems thereby only universal properties of oscillators and nonequilibrium thermostatting are used such that a maximal model independence of the hypothesised subquantum physics is guaranteed it is claimed that this represents the shortest derivation of the schroedinger equation from modern classical physics in the literature and the only exact one too moreover a vacuum fluctuation theorem is presented with particular emphasis on possible applications for a better understanding of quantum mechanical nonlocal effects
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711.4955
Josephson current and Andreev states in superconductor-half metal-superconductor heterostructures
We develop a detailed microscopic theory describing dc Josephson effect and Andreev bound states in superconducting junctions with a half-metal. In such systems the supercurrent is caused by triplet pairing states emerging due to spin-flip scattering at the interfaces between superconducting electrodes and the half-metal. For sufficiently clean metals we provide a detailed non-perturbative description of the Josephson current at arbitrary transmissions and spin-flip scattering parameters for both interfaces. Our analysis demonstrates that the behavior of both the Josephson current and Andreev bound states crucially depends on the strength of spin-flip scattering showing a rich variety of features which can be tested in future experiments.
cond-mat.supr-con
we develop a detailed microscopic theory describing dc josephson effect and andreev bound states in superconducting junctions with a halfmetal in such systems the supercurrent is caused by triplet pairing states emerging due to spinflip scattering at the interfaces between superconducting electrodes and the halfmetal for sufficiently clean metals we provide a detailed nonperturbative description of the josephson current at arbitrary transmissions and spinflip scattering parameters for both interfaces our analysis demonstrates that the behavior of both the josephson current and andreev bound states crucially depends on the strength of spinflip scattering showing a rich variety of features which can be tested in future experiments
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711.4956
Charmless Hadronic B Decays at BABAR
We report recent measurements of branching fractions and charge asymmetries of charmless hadronic B decays using the data collected with the BABAR detector at the PEP-II asymmetric energy e+e- collider.
hep-ex
we report recent measurements of branching fractions and charge asymmetries of charmless hadronic b decays using the data collected with the babar detector at the pepii asymmetric energy ee collider
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711.4957
Equality statements for entropy change in open systems
The entropy change of a (non-equilibrium) Markovian ensemble is calculated from (1) the ensemble phase density $p(t)$ evolved as iterative map, $p(t) = \mathbb{M}(t) p(t- \Delta t)$ under detail balanced transition matrix $\mathbb{M}(t)$, and (2) the invariant phase density $\pi(t) = \mathbb{M}(t)^{\infty} \pi(t) $. A virtual measurement protocol is employed, where variational entropy is zero, generating exact expressions for irreversible entropy change in terms of the Jeffreys measure, $\mathcal{J}(t) = \sum_{\Gamma} [p(t) - \pi(t)] \ln \bfrac{p(t)}{\pi(t)}$, and for reversible entropy change in terms of the Kullbach-Leibler measure, $\mathcal{D}_{KL}(t) = \sum_{\Gamma} \pi(0) \ln \bfrac{\pi(0)}{\pi(t)}$. Five properties of $\mathcal{J}$ are discussed, and Clausius' theorem is derived.
cond-mat.stat-mech cond-mat.soft
the entropy change of a nonequilibrium markovian ensemble is calculated from 1 the ensemble phase density pt evolved as iterative map pt mathbbmt pt delta t under detail balanced transition matrix mathbbmt and 2 the invariant phase density pit mathbbmtinfty pit a virtual measurement protocol is employed where variational entropy is zero generating exact expressions for irreversible entropy change in terms of the jeffreys measure mathcaljt sum_gamma pt pit ln bfracptpit and for reversible entropy change in terms of the kullbachleibler measure mathcald_klt sum_gamma pi0 ln bfracpi0pit five properties of mathcalj are discussed and clausius theorem is derived
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711.4958
Diffusion Monte Carlo calculations for the ground states of atoms and ions in neutron star magnetic fields
The diffusion quantum Monte Carlo method is extended to solve the old theoretical physics problem of many-electron atoms and ions in intense magnetic fields. The feature of our approach is the use of adiabatic approximation wave functions augmented by a Jastrow factor as guiding functions to initialize the quantum Monte Carlo prodecure. We calcula te the ground state energies of atoms and ions with nuclear charges from Z= 2, 3, 4, ..., 26 for magnetic field strengths relevant for neutron stars.
quant-ph
the diffusion quantum monte carlo method is extended to solve the old theoretical physics problem of manyelectron atoms and ions in intense magnetic fields the feature of our approach is the use of adiabatic approximation wave functions augmented by a jastrow factor as guiding functions to initialize the quantum monte carlo prodecure we calcula te the ground state energies of atoms and ions with nuclear charges from z 2 3 4 26 for magnetic field strengths relevant for neutron stars
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711.4959
Affine actions on Nilpotent Lie groups
To any connected and simply connected nilpotent Lie group N, one can associate its group of affine transformations Aff(N). In this paper, we study simply transitive actions of a given nilpotent Lie group G on another nilpotent Lie group N, via such affine transformations. We succeed in translating the existence question of such a simply transitive affine action to a corresponding question on the Lie algebra level. As an example of the possible use of this translation, we then consider the case where dim(G)=dim(N) less than 6. Finally, we specialize to the case of abelian simply transitive affine actions on a given connected and simply connected nilpotent Lie group. It turns out that such a simply transitive abelian affine action on N corresponds to a particular Lie compatible bilinear product on the Lie algebra of N, which we call an LR-structure.
math.DG math.GR
to any connected and simply connected nilpotent lie group n one can associate its group of affine transformations affn in this paper we study simply transitive actions of a given nilpotent lie group g on another nilpotent lie group n via such affine transformations we succeed in translating the existence question of such a simply transitive affine action to a corresponding question on the lie algebra level as an example of the possible use of this translation we then consider the case where dimgdimn less than 6 finally we specialize to the case of abelian simply transitive affine actions on a given connected and simply connected nilpotent lie group it turns out that such a simply transitive abelian affine action on n corresponds to a particular lie compatible bilinear product on the lie algebra of n which we call an lrstructure
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711.496
Coherent backscattering of light from saturated atoms
We survey recent progress achieved in understanding the impact of inelastic processes on coherent backscattering of light from cold atoms that are saturated by a powerful laser field.
quant-ph
we survey recent progress achieved in understanding the impact of inelastic processes on coherent backscattering of light from cold atoms that are saturated by a powerful laser field
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711.4961
Bicartesian Coherence Revisited
A survey is given of results about coherence for categories with finite products and coproducts. For these results, which were published previously by the authors in several places, some formulations and proofs are here corrected, and matters are updated. The categories investigated in this paper formalize equality of proofs in classical and intuitionistic conjunctive-disjunctive logic without distribution of conjunction over disjunction.
math.CT math.LO
a survey is given of results about coherence for categories with finite products and coproducts for these results which were published previously by the authors in several places some formulations and proofs are here corrected and matters are updated the categories investigated in this paper formalize equality of proofs in classical and intuitionistic conjunctivedisjunctive logic without distribution of conjunction over disjunction
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711.4962
Five-dimensional black holes in heterotic string theory
We review recent results on near-horizon static black hole solutions and entropy in R^2-corrected N=2 SUGRA in D=5, focusing on actions connected to heterotic string compactified on K3\times S^1. Comparison with \alpha'-perturbative results, results obtained by using simple Gauss-Bonnet R^2-correction, OSV conjecture and microscopic stringy description (for small black holes) shows that situation in D=5 is, in a sense, even more interesting then in D=4.
hep-th
we review recent results on nearhorizon static black hole solutions and entropy in r2corrected n2 sugra in d5 focusing on actions connected to heterotic string compactified on k3times s1 comparison with alphaperturbative results results obtained by using simple gaussbonnet r2correction osv conjecture and microscopic stringy description for small black holes shows that situation in d5 is in a sense even more interesting then in d4
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711.4963
On a continuity theorem for constructive functions
One proves that any everywhere defined constructive mapping from a complete metric space into a complete metric space which preserves the property of precompacity of subsets is locally uniformly continuous. This fact can be viewed as interpretation of L. E. J. Brower's fan theorem in terms of A. A. Markov's constructive analysis.
math.LO math.FA
one proves that any everywhere defined constructive mapping from a complete metric space into a complete metric space which preserves the property of precompacity of subsets is locally uniformly continuous this fact can be viewed as interpretation of l e j browers fan theorem in terms of a a markovs constructive analysis
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711.4964
Indexing astronomical database tables using HTM and HEALPix
In various astronomical projects it is crucial to have coordinates indexed tables. All sky optical and IR catalogues have up to 1 billion objects that will increase with forthcoming projects. Also partial sky surveys at various wavelengths can collect information (not just source lists) which can be saved in coordinate ordered tables. Selecting a sub-set of these entries or cross-matching them could be un-feasible if no indexing is performed. Sky tessellation with various mapping functions have been proposed. It is a matter of fact that the astronomical community is accepting the HTM and HEALPix schema as the default for object catalogues and for maps visualization and analysis, respectively. Within the MCS library project, we have now made available as MySQL-callable functions various HTM and HEALPix facilities. This is made possible thanks to the capability offered by MySQL 5.1 to add external plug-ins. The DIF (Dynamic Indexing Facilities) package distributed within the MCS library, creates and manages a combination of Views, Triggers, DB-engine and plug-ins allowing the user to deal with database tables indexed using one or both these pixelisation schema in a completely transparent way.
astro-ph
in various astronomical projects it is crucial to have coordinates indexed tables all sky optical and ir catalogues have up to 1 billion objects that will increase with forthcoming projects also partial sky surveys at various wavelengths can collect information not just source lists which can be saved in coordinate ordered tables selecting a subset of these entries or crossmatching them could be unfeasible if no indexing is performed sky tessellation with various mapping functions have been proposed it is a matter of fact that the astronomical community is accepting the htm and healpix schema as the default for object catalogues and for maps visualization and analysis respectively within the mcs library project we have now made available as mysqlcallable functions various htm and healpix facilities this is made possible thanks to the capability offered by mysql 51 to add external plugins the dif dynamic indexing facilities package distributed within the mcs library creates and manages a combination of views triggers dbengine and plugins allowing the user to deal with database tables indexed using one or both these pixelisation schema in a completely transparent way
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711.4965
Lattice study of meson correlators in the epsilon-regime of two-flavor QCD
We calculate mesonic two-point functions in the epsilon-regime of two-flavor QCD on the lattice with exact chiral symmetry. We use gauge configurations of size 16^3 32 at the lattice spacing a \sim 0.11 fm generated with dynamical overlap fermions. The sea quark mass is fixed at \sim 3 MeV and the valence quark mass is varied in the range 1-4 MeV, both of which are in the epsilon-regime. We find a good consistency with the expectations from the next-to-leading order calculation in the epsilon-expansion of (partially quenched) chiral perturbation theory. From a fit we obtain the pion decay constant F=87.3(5.6) MeV and the chiral condensate Sigma^{MS}=[239.8(4.0) MeV ]^3 up to next-to-next-to-leading order contributions.
hep-lat
we calculate mesonic twopoint functions in the epsilonregime of twoflavor qcd on the lattice with exact chiral symmetry we use gauge configurations of size 163 32 at the lattice spacing a sim 011 fm generated with dynamical overlap fermions the sea quark mass is fixed at sim 3 mev and the valence quark mass is varied in the range 14 mev both of which are in the epsilonregime we find a good consistency with the expectations from the nexttoleading order calculation in the epsilonexpansion of partially quenched chiral perturbation theory from a fit we obtain the pion decay constant f87356 mev and the chiral condensate sigmams239840 mev 3 up to nexttonexttoleading order contributions
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711.4966
New formulations for dual equivalent actions
New actions in D=2 and D=3 are proposed that are dual equivalent to known theories displaying well defined chirality and helicity, respectively, along with a new interpolating action that maps continuously through the original dualities. The new chiral action in D=2 is a second-order theory displaying the chiral constraint dynamically while in D=3 the helicity constraint is imposed a la Siegel. The resulting theories introduce new versions of the Hull noton to take care of the symmetry aspects of the original models. The new interpolating formulation is then re-examined as a condensed phase for the discussion of duality under the light of the dual mechanisms -- Julia-Toulouse and Higgs -- establishing new interpolating actions in the dilute phase, according to these mechanisms.
hep-th
new actions in d2 and d3 are proposed that are dual equivalent to known theories displaying well defined chirality and helicity respectively along with a new interpolating action that maps continuously through the original dualities the new chiral action in d2 is a secondorder theory displaying the chiral constraint dynamically while in d3 the helicity constraint is imposed a la siegel the resulting theories introduce new versions of the hull noton to take care of the symmetry aspects of the original models the new interpolating formulation is then reexamined as a condensed phase for the discussion of duality under the light of the dual mechanisms juliatoulouse and higgs establishing new interpolating actions in the dilute phase according to these mechanisms
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711.4967
Equivalent Hamiltonian for Lee Model
Using the techniques of quasi-Hermitian quantum mechanics and quantum field theory we use a similarity transformation to construct an equivalent Hermitian Hamiltonian for the Lee model. In the field theory confined to the $V/N\theta$ sector it effectively decouples $V$, replacing the three-point interaction of the original Lee model by an additional mass term for the $V$ particle and a four-point interaction between $N$ and $\theta$. While the construction is originally motivated by the regime where the bare coupling becomes imaginary, leading to a ghost, it applies equally to the standard Hermitian regime where the bare coupling is real. In that case the similarity transformation becomes a unitary transformation.
hep-th
using the techniques of quasihermitian quantum mechanics and quantum field theory we use a similarity transformation to construct an equivalent hermitian hamiltonian for the lee model in the field theory confined to the vntheta sector it effectively decouples v replacing the threepoint interaction of the original lee model by an additional mass term for the v particle and a fourpoint interaction between n and theta while the construction is originally motivated by the regime where the bare coupling becomes imaginary leading to a ghost it applies equally to the standard hermitian regime where the bare coupling is real in that case the similarity transformation becomes a unitary transformation
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711.4968
Meridional flow profile measurements with SOHO/MDI
We present meridional flow measurements of the Sun using a novel helioseismic approach for analyzing SOHO/MDI data in order to push the current limits in radial depth. Analyzing three consecutive months of data during solar minimum, we find that the meridional flow is as expected poleward in the upper convection zone, turns equatorward at a depth of around 40 Mm (~0.95 Rsol), and possibly changes direction again in the lower convection zone. This may indicate two meridional circulation cells in each hemisphere, one beneath the other.
astro-ph
we present meridional flow measurements of the sun using a novel helioseismic approach for analyzing sohomdi data in order to push the current limits in radial depth analyzing three consecutive months of data during solar minimum we find that the meridional flow is as expected poleward in the upper convection zone turns equatorward at a depth of around 40 mm 095 rsol and possibly changes direction again in the lower convection zone this may indicate two meridional circulation cells in each hemisphere one beneath the other
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711.4969
EeV neutrinos associated with UHECR sources
Electromagnetic energy losses of charged pions and muons suppress the expected high energy, >1E18 eV, neutrino emission from sources of ultrahigh energy, >1E19 eV, cosmic-rays. We show here that >1E19 eV photons produced in such sources by neutral pion decay may escape the sources, thanks to the Klein-Nishina suppression of the pair production cross section, and produce muon pairs in interactions with the cosmic microwave background. The flux of muon decay neutrinos, which are expected to be associated in time and direction with the electromagnetic emission from the sources, may reach a few percent of the Waxman-Bahcall bound. Their detection may allow one to directly identify the sources of >1E19 eV cosmic-rays, and will provide the most stringent constraints on quantum-gravity-induced Lorentz violation.
hep-ph astro-ph astro-ph.HE
electromagnetic energy losses of charged pions and muons suppress the expected high energy 1e18 ev neutrino emission from sources of ultrahigh energy 1e19 ev cosmicrays we show here that 1e19 ev photons produced in such sources by neutral pion decay may escape the sources thanks to the kleinnishina suppression of the pair production cross section and produce muon pairs in interactions with the cosmic microwave background the flux of muon decay neutrinos which are expected to be associated in time and direction with the electromagnetic emission from the sources may reach a few percent of the waxmanbahcall bound their detection may allow one to directly identify the sources of 1e19 ev cosmicrays and will provide the most stringent constraints on quantumgravityinduced lorentz violation
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711.497
Scarring in open quantum systems
We study scarring phenomena in open quantum systems. We show numerical evidence that individual resonance eigenstates of an open quantum system present localization around unstable short periodic orbits in a similar way as their closed counterparts. The structure of eigenfunctions around these classical objects is not destroyed by the opening. This is exposed in a paradigmatic system of quantum chaos, the cat map.
quant-ph nlin.CD
we study scarring phenomena in open quantum systems we show numerical evidence that individual resonance eigenstates of an open quantum system present localization around unstable short periodic orbits in a similar way as their closed counterparts the structure of eigenfunctions around these classical objects is not destroyed by the opening this is exposed in a paradigmatic system of quantum chaos the cat map
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711.4971
Occurrence of exponential relaxation in closed quantum systems
We investigate the occurrence of exponential relaxation in a certain class of closed, finite systems on the basis of a time-convolutionless (TCL) projection operator expansion for a specific class of initial states with vanishing inhomogeneity. It turns out that exponential behavior is to be expected only if the leading order predicts the standard separation of timescales and if, furthermore, all higher orders remain negligible for the full relaxation time. The latter, however, is shown to depend not only on the perturbation (interaction) strength, but also crucially on the structure of the perturbation matrix. It is shown that perturbations yielding exponential relaxation have to fulfill certain criteria, one of which relates to the so-called ``Van Hove structure''. All our results are verified by the numerical integration of the full time-dependent Schroedinger equation.
cond-mat.stat-mech
we investigate the occurrence of exponential relaxation in a certain class of closed finite systems on the basis of a timeconvolutionless tcl projection operator expansion for a specific class of initial states with vanishing inhomogeneity it turns out that exponential behavior is to be expected only if the leading order predicts the standard separation of timescales and if furthermore all higher orders remain negligible for the full relaxation time the latter however is shown to depend not only on the perturbation interaction strength but also crucially on the structure of the perturbation matrix it is shown that perturbations yielding exponential relaxation have to fulfill certain criteria one of which relates to the socalled van hove structure all our results are verified by the numerical integration of the full timedependent schroedinger equation
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711.4972
Existence of Asymptotic Expansions in Noncommutative Quantum Field Theories
Starting from the complete Mellin representation of Feynman amplitudes for noncommutative vulcanized scalar quantum field theory, introduced in a previous publication, we generalize to this theory the study of asymptotic behaviours under scaling of arbitrary subsets of external invariants of any Feynman amplitude. This is accomplished for both convergent and renormalized amplitudes.
hep-th math-ph math.MP
starting from the complete mellin representation of feynman amplitudes for noncommutative vulcanized scalar quantum field theory introduced in a previous publication we generalize to this theory the study of asymptotic behaviours under scaling of arbitrary subsets of external invariants of any feynman amplitude this is accomplished for both convergent and renormalized amplitudes
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711.4973
Energy absorption of xenon clusters in helium nanodroplets under strong laser pulses
Energy absorption of xenon clusters embedded in helium nanodroplets from strong femtosecond laser pulses is studied theoretically. Compared to pure clusters we find earlier and more efficient energy absorption in agreement with experiments. This effect is due to resonant absorption of the helium nanoplasma whose formation is catalyzed by the xenon core. For very short double pulses with variable delay both plasma resonances, due to the helium shell and the xenon core, are identified and the experimental conditions are given which should allow for a simultaneous observation of both of them.
physics.atm-clus
energy absorption of xenon clusters embedded in helium nanodroplets from strong femtosecond laser pulses is studied theoretically compared to pure clusters we find earlier and more efficient energy absorption in agreement with experiments this effect is due to resonant absorption of the helium nanoplasma whose formation is catalyzed by the xenon core for very short double pulses with variable delay both plasma resonances due to the helium shell and the xenon core are identified and the experimental conditions are given which should allow for a simultaneous observation of both of them
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711.4974
Polarimetry of the dwarf planet (136199) Eris
We investigate the surface characteristics of the large dwarf planet (136199) Eris. With the FORS1 instrument of the ESO VLT, we have obtained Bessell broadband R linear polarimetry and broadband V and I photometry. We have modelled the observations in terms of the coherent-backscattering mechanism to constrain the surface properties of the object. Polarimetric observations of Eris show a small negative linear polarization without opposition surge in the phase angle range of 0.15-0.5 degrees. The photometric data allow us to suppose a brightness opposition peak at phase angles below 0.2-0.3 degrees. The data obtained suggest possible similarity to the polarimetric and photometric phase curves of Pluto. The measured absolute magnitude and broadband colors of Eris are H_V=-1.15, V-R=0.41, and V-I=0.75.
astro-ph
we investigate the surface characteristics of the large dwarf planet 136199 eris with the fors1 instrument of the eso vlt we have obtained bessell broadband r linear polarimetry and broadband v and i photometry we have modelled the observations in terms of the coherentbackscattering mechanism to constrain the surface properties of the object polarimetric observations of eris show a small negative linear polarization without opposition surge in the phase angle range of 01505 degrees the photometric data allow us to suppose a brightness opposition peak at phase angles below 0203 degrees the data obtained suggest possible similarity to the polarimetric and photometric phase curves of pluto the measured absolute magnitude and broadband colors of eris are h_v115 vr041 and vi075
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711.4975
Resolving the ionized wind of the post-Red Supergiant IRC +10 420 with VLTI/AMBER
The paper investigates the milli-arcsecond scale structure of the present-day mass-loss of the post-Red Supergiant IRC+10420. We use three telescopes of the VLT Interferometer in combination with the AMBER near-infrared beam combiner to measure spectrally dispersed correlated fluxes in the K-band around the Br gamma transition. The resulting visibilities are compared to the predicted visibilities of emission structures with various simple models in order to infer the size of the observed emission region. The Br gamma line is resolved by VLTI+AMBER on all three baselines, with the maximum projected baseline extending 69 meter and a P.A. ranging between 10 and 30 degrees. A differential phase between line and continuum is detected on the longest baseline. The Br gamma emission region is found to have a diameter of 3.3 milli-arcseconds (FWHM), when compared to a Gaussian intensity distribution. A uniform disk and a ring-like intensity distribution do not fit the line visibilities. Comparing the AMBER equivalent width of Br gamma with measurements from various epochs, we find that the stellar photosphere contributes about 60% of the total continuum light at 2.2 micron. The remaining 40% continuum emission is found on scales larger than the 66mas AMBER field of view. Using simple arguments, and assuming optically thick line emission, we find that the line emitting region is elongated. We briefly discuss the possibilities whether such a structure is due to a bi-polar flow or a circumstellar disk. (Abridged).
astro-ph
the paper investigates the milliarcsecond scale structure of the presentday massloss of the postred supergiant irc10420 we use three telescopes of the vlt interferometer in combination with the amber nearinfrared beam combiner to measure spectrally dispersed correlated fluxes in the kband around the br gamma transition the resulting visibilities are compared to the predicted visibilities of emission structures with various simple models in order to infer the size of the observed emission region the br gamma line is resolved by vltiamber on all three baselines with the maximum projected baseline extending 69 meter and a pa ranging between 10 and 30 degrees a differential phase between line and continuum is detected on the longest baseline the br gamma emission region is found to have a diameter of 33 milliarcseconds fwhm when compared to a gaussian intensity distribution a uniform disk and a ringlike intensity distribution do not fit the line visibilities comparing the amber equivalent width of br gamma with measurements from various epochs we find that the stellar photosphere contributes about 60 of the total continuum light at 22 micron the remaining 40 continuum emission is found on scales larger than the 66mas amber field of view using simple arguments and assuming optically thick line emission we find that the line emitting region is elongated we briefly discuss the possibilities whether such a structure is due to a bipolar flow or a circumstellar disk abridged
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711.4976
Shapes of Semiflexible Polymers in Confined Spaces
We investigate the conformations of a semiflexible polymer confined to a square box. Results of Monte Carlo simulations show the existence of a shape transition when the persistence length of the polymer becomes comparable to the dimensions of box. An order parameter is introduced to quantify this behavior. A simple mean-field model is constructed to study the effect of the shape transition on the effective persistence length of the polymer.
cond-mat.soft astro-ph physics.bio-ph
we investigate the conformations of a semiflexible polymer confined to a square box results of monte carlo simulations show the existence of a shape transition when the persistence length of the polymer becomes comparable to the dimensions of box an order parameter is introduced to quantify this behavior a simple meanfield model is constructed to study the effect of the shape transition on the effective persistence length of the polymer
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711.4977
Study of errors in strong gravitational lensing
We examine the accuracy of strong gravitational lensing determinations of the mass of galaxy clusters by comparing the conventional approach with the numerical integration of the fully relativistic null geodesic equations in the case of weak gravitational perturbations on Robertson-Walker metrics. In particular, we study spherically-symmetric, three-dimensional singular isothermal sphere models and the three-dimensional matter distribution of Navarro et al. (1997), which are both commonly used in gravitational lensing studies. In both cases we study two different methods for mass-density truncation along the line of sight: hard truncation and conventional (no truncation). We find that the relative error introduced in the total mass by the thin lens approximation alone is less than 0.3% in the singular isothermal sphere model, and less than 2% in the model of Navarro et al. (1997). The removal of hard truncation introduces an additional error of the same order of magnitude in the best case, and up to an order of magnitude larger in the worst case studied. Our results ensure that the future generation of precision cosmology experiments based on lensing studies will not require the removal of the thin-lens assumption, but they may require a careful handling of truncation.
astro-ph gr-qc
we examine the accuracy of strong gravitational lensing determinations of the mass of galaxy clusters by comparing the conventional approach with the numerical integration of the fully relativistic null geodesic equations in the case of weak gravitational perturbations on robertsonwalker metrics in particular we study sphericallysymmetric threedimensional singular isothermal sphere models and the threedimensional matter distribution of navarro et al 1997 which are both commonly used in gravitational lensing studies in both cases we study two different methods for massdensity truncation along the line of sight hard truncation and conventional no truncation we find that the relative error introduced in the total mass by the thin lens approximation alone is less than 03 in the singular isothermal sphere model and less than 2 in the model of navarro et al 1997 the removal of hard truncation introduces an additional error of the same order of magnitude in the best case and up to an order of magnitude larger in the worst case studied our results ensure that the future generation of precision cosmology experiments based on lensing studies will not require the removal of the thinlens assumption but they may require a careful handling of truncation
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711.4978
Jet reshaping in heavy-ion collisions
We propose a new implementation of medium effects in jet structures in which a modification of the splitting function is included at every step in the typical final state parton shower. Although the main application of this new formalism will be at the LHC, it is interesting that, in the presence of a trigger bias to small number of splittings, non-trivial angular dependences could appear with shapes similar to those measured experimentally at RHIC in high-pT particle correlations.
hep-ph
we propose a new implementation of medium effects in jet structures in which a modification of the splitting function is included at every step in the typical final state parton shower although the main application of this new formalism will be at the lhc it is interesting that in the presence of a trigger bias to small number of splittings nontrivial angular dependences could appear with shapes similar to those measured experimentally at rhic in highpt particle correlations
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711.4979
Testing the magnetic field models of galaxies with the SKA
The future new-generation radio telescope SKA (Square Kilometre Array) and its precursors will provide a rapidly growing number of polarized radio sources. Hundred and thousands polarized background sources can be measured towards nearby galaxies thus allowing their detailed magnetic field mapping by means of Faraday rotation measures (RM). We aim to estimate the required density of the background polarized sources detected with the SKA for reliable recognition and reconstruction of the magnetic field structure in nearby spiral galaxies. We construct a galaxy model which includes the ionized gas and magnetic field patterns of different azimuthal symmetry (axisymmetric (ASS), bisymmetric (BSS) and quadrisymmetric spiral (QSS), and superpositions) plus a halo magnetic field. RM fluctuations with a Kolmogorov spectrum due to turbulent fields and/or fluctuations in ionized gas density are superimposed. Recognition of magnetic structures is possible from RM towards background sources behind galaxies or a continuous RM map obtained from the diffuse polarized emission from the galaxy itself. Under favourite conditions, about a few dozens of polarized sources are sufficient for a reliable recognition. Reconstruction of the field structure without precognition becomes possible for a large number of background sources. A reliable reconstruction of the field structure needs at least 20 RM values on a cut along the projected minor axis which translates to approximately 1200 sources towards the galaxy. Radio telescopes operating at low frequencies (LOFAR, ASKAP and the low-frequency SKA array) may also be useful instruments for field recognition or reconstruction with the help of RM, if background sources are still significantly polarized at low frequencies (abriged).
astro-ph
the future newgeneration radio telescope ska square kilometre array and its precursors will provide a rapidly growing number of polarized radio sources hundred and thousands polarized background sources can be measured towards nearby galaxies thus allowing their detailed magnetic field mapping by means of faraday rotation measures rm we aim to estimate the required density of the background polarized sources detected with the ska for reliable recognition and reconstruction of the magnetic field structure in nearby spiral galaxies we construct a galaxy model which includes the ionized gas and magnetic field patterns of different azimuthal symmetry axisymmetric ass bisymmetric bss and quadrisymmetric spiral qss and superpositions plus a halo magnetic field rm fluctuations with a kolmogorov spectrum due to turbulent fields andor fluctuations in ionized gas density are superimposed recognition of magnetic structures is possible from rm towards background sources behind galaxies or a continuous rm map obtained from the diffuse polarized emission from the galaxy itself under favourite conditions about a few dozens of polarized sources are sufficient for a reliable recognition reconstruction of the field structure without precognition becomes possible for a large number of background sources a reliable reconstruction of the field structure needs at least 20 rm values on a cut along the projected minor axis which translates to approximately 1200 sources towards the galaxy radio telescopes operating at low frequencies lofar askap and the lowfrequency ska array may also be useful instruments for field recognition or reconstruction with the help of rm if background sources are still significantly polarized at low frequencies abriged
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711.498
Heavy ion collisions phenomenology overview
The reach of collider energies in heavy-ion collisions has profoundly changed our understanding of QCD under extreme conditions. I review some these new developments and comment on the properties of the produced medium as extracted from experimental data, as well as the exciting new opportunities which will be open at the LHC.
hep-ph
the reach of collider energies in heavyion collisions has profoundly changed our understanding of qcd under extreme conditions i review some these new developments and comment on the properties of the produced medium as extracted from experimental data as well as the exciting new opportunities which will be open at the lhc
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711.4981
Polaron relaxation in self-assembled quantum dots: Breakdown of the semi-classical model
We calculate the lifetime of conduction band excited states in self-assembled quantum dots by taking into account LO-phonon-electron interaction and various anharmonic phonon couplings. We show that polaron relaxation cannot be accurately described by a semi-classical model. The contributions of different anharmonic decay channels are shown to depend strongly on the polaron energy. We calculate the energy dependence of polaron lifetime and compare our results to available experimental measurements of polaron decay time in InAs/GaAs quantum dots.
cond-mat.mes-hall cond-mat.mtrl-sci
we calculate the lifetime of conduction band excited states in selfassembled quantum dots by taking into account lophononelectron interaction and various anharmonic phonon couplings we show that polaron relaxation cannot be accurately described by a semiclassical model the contributions of different anharmonic decay channels are shown to depend strongly on the polaron energy we calculate the energy dependence of polaron lifetime and compare our results to available experimental measurements of polaron decay time in inasgaas quantum dots
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711.4982
Semiclassical Droplet States in Matrix Quantum Hall Effect
We derive semiclassical ground state solutions that correspond to the quantum Hall states earlier found in the Maxwell-Chern-Simons matrix theory. They realize the Jain composite-fermion construction and their density is piecewise constant as that of phenomenological wave functions. These results support the matrix theory as a possible effective theory of the fractional Hall effect. A crucial role is played by the constraint limiting the degeneracy of matrix states: we find its explicit gauge invariant form and clarify its physical interpretation.
hep-th cond-mat.mes-hall
we derive semiclassical ground state solutions that correspond to the quantum hall states earlier found in the maxwellchernsimons matrix theory they realize the jain compositefermion construction and their density is piecewise constant as that of phenomenological wave functions these results support the matrix theory as a possible effective theory of the fractional hall effect a crucial role is played by the constraint limiting the degeneracy of matrix states we find its explicit gauge invariant form and clarify its physical interpretation
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711.4983
A Method for Compressing Parameters in Bayesian Models with Application to Logistic Sequence Prediction Models
Bayesian classification and regression with high order interactions is largely infeasible because Markov chain Monte Carlo (MCMC) would need to be applied with a great many parameters, whose number increases rapidly with the order. In this paper we show how to make it feasible by effectively reducing the number of parameters, exploiting the fact that many interactions have the same values for all training cases. Our method uses a single ``compressed'' parameter to represent the sum of all parameters associated with a set of patterns that have the same value for all training cases. Using symmetric stable distributions as the priors of the original parameters, we can easily find the priors of these compressed parameters. We therefore need to deal only with a much smaller number of compressed parameters when training the model with MCMC. The number of compressed parameters may have converged before considering the highest possible order. After training the model, we can split these compressed parameters into the original ones as needed to make predictions for test cases. We show in detail how to compress parameters for logistic sequence prediction models. Experiments on both simulated and real data demonstrate that a huge number of parameters can indeed be reduced by our compression method.
stat.ML stat.ME
bayesian classification and regression with high order interactions is largely infeasible because markov chain monte carlo mcmc would need to be applied with a great many parameters whose number increases rapidly with the order in this paper we show how to make it feasible by effectively reducing the number of parameters exploiting the fact that many interactions have the same values for all training cases our method uses a single compressed parameter to represent the sum of all parameters associated with a set of patterns that have the same value for all training cases using symmetric stable distributions as the priors of the original parameters we can easily find the priors of these compressed parameters we therefore need to deal only with a much smaller number of compressed parameters when training the model with mcmc the number of compressed parameters may have converged before considering the highest possible order after training the model we can split these compressed parameters into the original ones as needed to make predictions for test cases we show in detail how to compress parameters for logistic sequence prediction models experiments on both simulated and real data demonstrate that a huge number of parameters can indeed be reduced by our compression method
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711.4984
Rotation and Macroturbulence in Metal-poor Field Red Giant and Red Horizontal Branch Stars
We report the results for rotational velocities, Vrot sin i, and macroturbulence dispersion, zeta(RT), for 12 metal-poor field red giant branch stars and 7 metal-poor field red horizontal branch stars. The results are based on Fourier transform analyses of absorption line profiles from high-resolution (R ~ 120,000), high-S/N (~ 215 per pixel) spectra obtained with the Gecko spectrograph at CFHT. We find that the zeta(RT) values for the metal-poor RGB stars are very similar to those for metal-rich disk giants studied earlier by Gray and his collaborators. Six of the RGB stars have small rotational values, less than 2.0 km/sec, while five show significant rotation, over 3 km/sec. The fraction of rapidly rotating RHB stars is somewhat lower than found among BHB stars. We devise two empirical methods to translate the line-broadening results obtained by Carney et al. (2003, 2008) into Vrot sin i for all the RGB and RHB stars they studied. Binning the RGB stars by luminosity, we find that most metal-poor field RGB stars show no detectable sign, on average, of rotation. However, the most luminous stars, with M(V) <= -1.5, do show net rotation, with mean values of 2 to 4 km/sec, depending on the algorithm employed, and these stars also show signs of radial velocity jitter and mass loss.
astro-ph
we report the results for rotational velocities vrot sin i and macroturbulence dispersion zetart for 12 metalpoor field red giant branch stars and 7 metalpoor field red horizontal branch stars the results are based on fourier transform analyses of absorption line profiles from highresolution r 120000 highsn 215 per pixel spectra obtained with the gecko spectrograph at cfht we find that the zetart values for the metalpoor rgb stars are very similar to those for metalrich disk giants studied earlier by gray and his collaborators six of the rgb stars have small rotational values less than 20 kmsec while five show significant rotation over 3 kmsec the fraction of rapidly rotating rhb stars is somewhat lower than found among bhb stars we devise two empirical methods to translate the linebroadening results obtained by carney et al 2003 2008 into vrot sin i for all the rgb and rhb stars they studied binning the rgb stars by luminosity we find that most metalpoor field rgb stars show no detectable sign on average of rotation however the most luminous stars with mv 15 do show net rotation with mean values of 2 to 4 kmsec depending on the algorithm employed and these stars also show signs of radial velocity jitter and mass loss
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711.4985
Subalgebras of Lie algebras with non-degenerate restriction of the Killing form
Let $\mf{g}$ be any finite-dimensional Lie algebra with Killling form $B$. Let $\mf{h}$ be a subalgebra of $\mf{g}$ on which the Killing form is non degenerate. Then $\mf{h}$ is reductive.
math.RA
let mfg be any finitedimensional lie algebra with killling form b let mfh be a subalgebra of mfg on which the killing form is non degenerate then mfh is reductive
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711.4986
On highly transcendental quantities which cannot be expressed by integral formulas
E565 in the Enestrom index. Translated from the Latin original, "De plurimis quantitatibus transcendentibus quas nullo modo per formulas integrales exprimere licet" (1775). Euler does not prove any results in this paper. It seems to me like he is trying to develop some general ideas about special functions. He gives some examples of numbers he claims but does not prove cannot be represented by definite integrals of algebraic functions. Euler has the idea that if we knew more about the function with the power series $\sum x^{t_n}$ where $t_n$ is the $n$th triangular number, this could lead to a proof of Fermat's theorem that every positive integer is the sum of three triangular numbers. This doesn't end of being fruitful for Euler, but in fact later Jacobi proves a lot of results like this with his theta functions. The last paragraph (\S 9) is not clear to me. My best reading is that there are infinitely many "levels" of transcendental numbers and that this is unexpected or remarkable.
math.HO math.CA
e565 in the enestrom index translated from the latin original de plurimis quantitatibus transcendentibus quas nullo modo per formulas integrales exprimere licet 1775 euler does not prove any results in this paper it seems to me like he is trying to develop some general ideas about special functions he gives some examples of numbers he claims but does not prove cannot be represented by definite integrals of algebraic functions euler has the idea that if we knew more about the function with the power series sum xt_n where t_n is the nth triangular number this could lead to a proof of fermats theorem that every positive integer is the sum of three triangular numbers this doesnt end of being fruitful for euler but in fact later jacobi proves a lot of results like this with his theta functions the last paragraph s 9 is not clear to me my best reading is that there are infinitely many levels of transcendental numbers and that this is unexpected or remarkable
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711.4987
Okubo-Zweig-Iizuka-rule violation and B\to \eta^{(\prime)}K branching ratios
We show that few-percent Okubo-Zweig-Iizuka-rule violating effects in the quark-flavor basis for the $\eta$-$\eta'$ mixing can enhance the chiral scale associated with the $\eta_q$ meson few times. This enhancement is sufficient for accommodating the dramatically different data of the $B\to\eta^{\prime} K$ and $B\to\eta K$ branching ratios. We comment on other proposals for resolving this problem, including flavor-singlet contributions, axial U(1) anomaly, and nonperturbative charming penguins. Discrimination of the above proposals by means of the $B\to\eta^{(\prime)}\ell\nu$ and $B_s\to\eta^{(\prime)}\ell\ell$ data is suggested.
hep-ph
we show that fewpercent okubozweigiizukarule violating effects in the quarkflavor basis for the etaeta mixing can enhance the chiral scale associated with the eta_q meson few times this enhancement is sufficient for accommodating the dramatically different data of the btoetaprime k and btoeta k branching ratios we comment on other proposals for resolving this problem including flavorsinglet contributions axial u1 anomaly and nonperturbative charming penguins discrimination of the above proposals by means of the btoetaprimeellnu and b_stoetaprimeellell data is suggested
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711.4988
Detection of an inner gaseous component in a Herbig Be star accretion disk: Near- and mid-infrared spectro-interferometry and radiative transfer modeling of MWC 147
We study the geometry and the physical conditions in the inner (AU-scale) circumstellar region around the young Herbig Be star MWC 147 using long-baseline spectro-interferometry in the near-infrared (NIR K-band, VLTI/AMBER observations and PTI archive data) as well as the mid-infrared (MIR N-band, VLTI/MIDIobservations). The emission from MWC 147 is clearly resolved and has a characteristic physical size of approx. 1.3 AU and 9 AU at 2.2 micron and 11 micron respectively (Gaussian diameter). The spectrally dispersed AMBER and MIDI interferograms both show a strong increase in the characteristic size towards longer wavelengths, much steeper than predicted by analytic disk models assuming power-law radial temperature distributions. We model the interferometric data and the spectral energy distribution of MWC 147 with 2-D, frequency-dependent radiation transfer simulations. This analysis shows that models of spherical envelopes or passive irradiated Keplerian disks (with vertical or curved puffed-up inner rim) can easily fit the SED, but predict much lower visibilities than observed; the angular size predicted by such models is 2 to 4 times larger than the size derived from the interferometric data, so these models can clearly be ruled out. Models of a Keplerian disk with optically thick gas emission from an active gaseous disk (inside the dust sublimation zone), however, yield a good fit of the SED and simultaneously reproduce the absolute level and the spectral dependence of the NIR and MIR visibilities. We conclude that the NIR continuum emission from MWC 147 is dominated by accretion luminosity emerging from an optically thick inner gaseous disk, while the MIR emission also contains contributions from the outer, irradiated dust disk.
astro-ph
we study the geometry and the physical conditions in the inner auscale circumstellar region around the young herbig be star mwc 147 using longbaseline spectrointerferometry in the nearinfrared nir kband vltiamber observations and pti archive data as well as the midinfrared mir nband vltimidiobservations the emission from mwc 147 is clearly resolved and has a characteristic physical size of approx 13 au and 9 au at 22 micron and 11 micron respectively gaussian diameter the spectrally dispersed amber and midi interferograms both show a strong increase in the characteristic size towards longer wavelengths much steeper than predicted by analytic disk models assuming powerlaw radial temperature distributions we model the interferometric data and the spectral energy distribution of mwc 147 with 2d frequencydependent radiation transfer simulations this analysis shows that models of spherical envelopes or passive irradiated keplerian disks with vertical or curved puffedup inner rim can easily fit the sed but predict much lower visibilities than observed the angular size predicted by such models is 2 to 4 times larger than the size derived from the interferometric data so these models can clearly be ruled out models of a keplerian disk with optically thick gas emission from an active gaseous disk inside the dust sublimation zone however yield a good fit of the sed and simultaneously reproduce the absolute level and the spectral dependence of the nir and mir visibilities we conclude that the nir continuum emission from mwc 147 is dominated by accretion luminosity emerging from an optically thick inner gaseous disk while the mir emission also contains contributions from the outer irradiated dust disk
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711.4989
The Local Hubble Flow: Is it a Manifestation of Dark Energy?
To study the local Hubble flow, we have run constrained dark matter (DM) simulations of the Local Group (LG) in the concordance LCDM and OCDM cosmologies, with identical cosmological parameters apart from the Lambda term. The simulations were performed within a computational box of 64 h^{-1}Mpc centred on the LG. The initial conditions were constrained by the observed peculiar velocities of galaxies and positions of X-ray nearby clusters of galaxies. The simulations faithfully reproduce the nearby large scale structure, and in particular the Local Supercluster and the Virgo cluster. LG-like objects have been selected from the DM halos so as to closely resemble the dynamical properties of the LG. Both the LCDM and OCDM simulations show very similar local Hubble flow around the LG-like objects. It follows that, contrary to recent statements, the dark energy (DE) does not manifest itself in the local dynamics.
astro-ph
to study the local hubble flow we have run constrained dark matter dm simulations of the local group lg in the concordance lcdm and ocdm cosmologies with identical cosmological parameters apart from the lambda term the simulations were performed within a computational box of 64 h1mpc centred on the lg the initial conditions were constrained by the observed peculiar velocities of galaxies and positions of xray nearby clusters of galaxies the simulations faithfully reproduce the nearby large scale structure and in particular the local supercluster and the virgo cluster lglike objects have been selected from the dm halos so as to closely resemble the dynamical properties of the lg both the lcdm and ocdm simulations show very similar local hubble flow around the lglike objects it follows that contrary to recent statements the dark energy de does not manifest itself in the local dynamics
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711.499
Finding the growth rate of a regular language in polynomial time
We give an O(n^3+n^2 t) time algorithm to determine whether an NFA with n states and t transitions accepts a language of polynomial or exponential growth. We also show that given a DFA accepting a language of polynomial growth, we can determine the order of polynomial growth in quadratic time.
cs.DM cs.DS
we give an on3n2 t time algorithm to determine whether an nfa with n states and t transitions accepts a language of polynomial or exponential growth we also show that given a dfa accepting a language of polynomial growth we can determine the order of polynomial growth in quadratic time
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711.4991
Laser experiments explore the hidden sector
Recently, the laser experiments BMV and GammeV, searching for light shining through walls, have published data and calculated new limits on the allowed masses and couplings for axion-like particles. In this note we point out that these experiments can serve to constrain a much wider variety of hidden-sector particles such as, e.g., minicharged particles and hidden-sector photons. The new experiments improve the existing bounds from the older BFRT experiment by a factor of two. Moreover, we use the new PVLAS constraints on a possible rotation and ellipticity of light after it has passed through a strong magnetic field to constrain pure minicharged particle models. For masses <~0.05 eV, the charge is now restricted to be less than (3-4)x10^(-7) times the electron electric charge. This is the best laboratory bound and comparable to bounds inferred from the energy spectrum of the cosmic microwave background.
hep-ph
recently the laser experiments bmv and gammev searching for light shining through walls have published data and calculated new limits on the allowed masses and couplings for axionlike particles in this note we point out that these experiments can serve to constrain a much wider variety of hiddensector particles such as eg minicharged particles and hiddensector photons the new experiments improve the existing bounds from the older bfrt experiment by a factor of two moreover we use the new pvlas constraints on a possible rotation and ellipticity of light after it has passed through a strong magnetic field to constrain pure minicharged particle models for masses 005 ev the charge is now restricted to be less than 34x107 times the electron electric charge this is the best laboratory bound and comparable to bounds inferred from the energy spectrum of the cosmic microwave background
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711.4992
Isoscaling, Symmetry Energy and Thermodynamic Models
The isoscaling parameter usually denoted by $\alpha$ depends upon both the symmetry energy coefficient and the isotopic contents of the dissociating systems. We compute $\alpha$ in theoretical models: first in a simple mean field model and then in thermodynamic models using both grand canonical and canonical ensembles. For finite systems the canonical ensemble is much more appropriate. The model values of $\alpha$ are compared with a much used standard formula. Next we turn to cases where in experiments, there are significant deviations from isoscaling. We show that in such cases, although the grand canonical model fails, the canonical model is capable of explaining the data.
nucl-th
the isoscaling parameter usually denoted by alpha depends upon both the symmetry energy coefficient and the isotopic contents of the dissociating systems we compute alpha in theoretical models first in a simple mean field model and then in thermodynamic models using both grand canonical and canonical ensembles for finite systems the canonical ensemble is much more appropriate the model values of alpha are compared with a much used standard formula next we turn to cases where in experiments there are significant deviations from isoscaling we show that in such cases although the grand canonical model fails the canonical model is capable of explaining the data
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711.4993
Majorana Neutrinos, Neutrino Mass Spectrum and the |<m>| ~ 0.001 eV Frontier in Neutrinoless Double Beta Decay
If future neutrino oscillation experiments show that the neutrino mass spectrum is with normal ordering, m1 < m2 < m3, and the searches for neutrinoless double beta-decay with sensitivity to values of the effective Majorana mass |<m>| > 0.01 eV give negative results, the next frontier in the quest for neutrinoless double beta-decay will correspond to |<m>| ~ 0.001 eV. Assuming that massive neutrinos are Majorana particles and their exchange is the dominant mechanism generating neutrinoless double beta-decay, we analise the conditions under which |<m>|, in the case of three neutrino mixing and neutrino mass spectrum with normal ordering, would satisfy |<m>| > 0.001 eV. We consider the specific cases of i) normal hierarchical neutrino mass spectrum, ii) of relatively small value of the CHOOZ angle theta13 as well as iii) the general case of spectrum with normal ordering, partial hierarchy and a value of theta13 close to the existing upper limit. We study the ranges of the lightest neutrino mass m1 and/or of sin^2 theta13, for which |<m>|> 0.001 eV and discuss the phenomenological implications of such scenarios. We provide also an estimate of |<m>| when the three neutrino masses and the neutrino mixing originate from neutrino mass term of Majorana type for the (left-handed) flavour neutrinos and m1 Ue1^2 + m2 U_e2^2 + m3 Ue3^2 =0, but there does not exist a symmetry which forbids the neutrinoless double beta-decay.
hep-ph
if future neutrino oscillation experiments show that the neutrino mass spectrum is with normal ordering m1 m2 m3 and the searches for neutrinoless double betadecay with sensitivity to values of the effective majorana mass m 001 ev give negative results the next frontier in the quest for neutrinoless double betadecay will correspond to m 0001 ev assuming that massive neutrinos are majorana particles and their exchange is the dominant mechanism generating neutrinoless double betadecay we analise the conditions under which m in the case of three neutrino mixing and neutrino mass spectrum with normal ordering would satisfy m 0001 ev we consider the specific cases of i normal hierarchical neutrino mass spectrum ii of relatively small value of the chooz angle theta13 as well as iii the general case of spectrum with normal ordering partial hierarchy and a value of theta13 close to the existing upper limit we study the ranges of the lightest neutrino mass m1 andor of sin2 theta13 for which m 0001 ev and discuss the phenomenological implications of such scenarios we provide also an estimate of m when the three neutrino masses and the neutrino mixing originate from neutrino mass term of majorana type for the lefthanded flavour neutrinos and m1 ue12 m2 u_e22 m3 ue32 0 but there does not exist a symmetry which forbids the neutrinoless double betadecay
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711.4994
Near threshold production of the pseudoscalar mesons at the COSY-11 facility
We summarise measurements of the COSY-11 collaboration concerning the excitation functions of the near threshold pseudoscalar meson production in the proton-proton interaction. The results are discussed in the context of the meson-nucleon and hyperon-nucleon interactions. We conclude that the $\eta$-proton interaction is significantly stronger than the eta'-proton interaction. Similarly, we found that the hyperon Lambda interacts with the nucleon considerably stronger than the hyperon Sigma, and that the interaction of (K-)-proton is much stronger than this of the (K+)-proton.
nucl-ex
we summarise measurements of the cosy11 collaboration concerning the excitation functions of the near threshold pseudoscalar meson production in the protonproton interaction the results are discussed in the context of the mesonnucleon and hyperonnucleon interactions we conclude that the etaproton interaction is significantly stronger than the etaproton interaction similarly we found that the hyperon lambda interacts with the nucleon considerably stronger than the hyperon sigma and that the interaction of kproton is much stronger than this of the kproton
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711.4995
Vigorous star formation with low efficiency in massive disk galaxies at z=1.5
We present the first detection of molecular gas cooling CO emission lines from ordinary massive galaxies at z=1.5. Two sources were observed with the IRAM Plateau de Bure Interferometer, selected to lie in the mass-star formation rate correlation at their redshift, thus being representative of massive high-z galaxies. Both sources were detected with high confidence, yielding L'_CO~10^{10}K km/s pc^2. For one of the sources we find evidence for velocity shear, implying CO sizes of ~10 kpc. With an infrared luminosity of L_FIR~10^{12}L_sun, these disk-like galaxies are borderline ULIRGs but with star formation efficiency similar to that of local spirals, and an order of magnitude lower than that in submm galaxies. This suggests a CO to total gas conversion factor similar to local spirals, gas consumption timescales approaching 1 Gyr or longer and molecular gas masses reaching ~10^11 M_sun, comparable to or larger than the estimated stellar masses. These results support a major role of 'in situ' gas consumption over cosmological timescales and with relatively low star formation efficiency, analogous to that of local spiral disks, for the formation of today's most massive galaxies and their central black holes. Given the high space density of similar galaxies, ~10^{-4}/Mpc^3, this implies a widespread presence of gas rich galaxies in the early Universe, many of which might be within reach of detailed investigations of current and planned facilities.
astro-ph
we present the first detection of molecular gas cooling co emission lines from ordinary massive galaxies at z15 two sources were observed with the iram plateau de bure interferometer selected to lie in the massstar formation rate correlation at their redshift thus being representative of massive highz galaxies both sources were detected with high confidence yielding l_co1010k kms pc2 for one of the sources we find evidence for velocity shear implying co sizes of 10 kpc with an infrared luminosity of l_fir1012l_sun these disklike galaxies are borderline ulirgs but with star formation efficiency similar to that of local spirals and an order of magnitude lower than that in submm galaxies this suggests a co to total gas conversion factor similar to local spirals gas consumption timescales approaching 1 gyr or longer and molecular gas masses reaching 1011 m_sun comparable to or larger than the estimated stellar masses these results support a major role of in situ gas consumption over cosmological timescales and with relatively low star formation efficiency analogous to that of local spiral disks for the formation of todays most massive galaxies and their central black holes given the high space density of similar galaxies 104mpc3 this implies a widespread presence of gas rich galaxies in the early universe many of which might be within reach of detailed investigations of current and planned facilities
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711.4996
Dark Matter Candidates: A Ten-Point Test
An extraordinarily rich zoo of non-baryonic Dark Matter candidates has been proposed over the last three decades. Here we present a 10-point test that a new particle has to pass, in order to be considered a viable DM candidate: I.) Does it match the appropriate relic density? II.) Is it {\it cold}? III.) Is it neutral? IV.) Is it consistent with BBN? V.) Does it leave stellar evolution unchanged? VI.) Is it compatible with constraints on self-interactions? VII.) Is it consistent with {\it direct} DM searches? VIII.) Is it compatible with gamma-ray constraints? IX.) Is it compatible with other astrophysical bounds? X.) Can it be probed experimentally?
astro-ph hep-ph hep-th
an extraordinarily rich zoo of nonbaryonic dark matter candidates has been proposed over the last three decades here we present a 10point test that a new particle has to pass in order to be considered a viable dm candidate i does it match the appropriate relic density ii is it it cold iii is it neutral iv is it consistent with bbn v does it leave stellar evolution unchanged vi is it compatible with constraints on selfinteractions vii is it consistent with it direct dm searches viii is it compatible with gammaray constraints ix is it compatible with other astrophysical bounds x can it be probed experimentally
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711.4997
Highest-Energy Cosmic Rays and Hilbertian Repulsive Effect
We point out that an important portion of the high energy of the cosmic rays from extragalactic sources can be attributed to a Hilbertian repulsive effect, which is a consequence of Einstein equations without cosmological term.
physics.gen-ph
we point out that an important portion of the high energy of the cosmic rays from extragalactic sources can be attributed to a hilbertian repulsive effect which is a consequence of einstein equations without cosmological term
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711.4998
Dynamics of the near threshold eta meson production in proton-proton interaction
We present the results of measurements of the analysing power for the p(pol)p --> pp eta reaction at the excess energies of Q=10 and 36 MeV, and interpret these results within the framework of the meson exchange models. The determined values of the analysing power at both excess energies are consistent with zero implying that the eta meson is produced predominantly in s-wave.
nucl-ex
we present the results of measurements of the analysing power for the ppolp pp eta reaction at the excess energies of q10 and 36 mev and interpret these results within the framework of the meson exchange models the determined values of the analysing power at both excess energies are consistent with zero implying that the eta meson is produced predominantly in swave
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711.4999
On the Ramsey multiplicity of complete graphs
We show that, for $n$ large, there must exist at least \[\frac{n^t}{C^{(1+o(1))t^2}}\] monochromatic $K_t$s in any two-colouring of the edges of $K_n$, where $C \approx 2.18$ is an explicitly defined constant. The old lower bound, due to Erd\H{o}s \cite{E62}, and based upon the standard bounds for Ramsey's theorem, is \[\frac{n^t}{4^{(1+o(1))t^2}}.\]
math.CO
we show that for n large there must exist at least fracntc1o1t2 monochromatic k_ts in any twocolouring of the edges of k_n where c approx 218 is an explicitly defined constant the old lower bound due to erdhos citee62 and based upon the standard bounds for ramseys theorem is fracnt41o1t2
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711.5
Critical temperature for first-order phase transitions in confined systems
We consider the Euclidean $D$-dimensional $-\lambda |\phi |^4+\eta |\phi |^6$ ($\lambda ,\eta >0 $) model with $d$ ($d\leq D$) compactified dimensions. Introducing temperature by means of the Ginzburg--Landau prescription in the mass term of the Hamiltonian, this model can be interpreted as describing a first-order phase transition for a system in a region of the $D$-dimensional space, limited by $d$ pairs of parallel planes, orthogonal to the coordinates axis $x_1, x_2, ..., x_d$. The planes in each pair are separated by distances $L_1, L_2, ..., L_d$. We obtain an expression for the transition temperature as a function of the size of the system, $% T_c(\{L_i\})$, $i=1, 2, ..., d$. For D=3 we particularize this formula, taking $L_1=L_2=... =L_d=L$ for the physically interesting cases $d=1$ (a film), $d=2$ (an infinitely long wire having a square cross-section), and for $d=3$ (a cube). For completeness, the corresponding formulas for second-order transitions are also presented. Comparison with experimental data for superconducting films and wires shows qualitative agreement with our theoretical expressions
cond-mat.soft cond-mat.supr-con hep-ph hep-th
we consider the euclidean ddimensional lambda phi 4eta phi 6 lambda eta 0 model with d dleq d compactified dimensions introducing temperature by means of the ginzburglandau prescription in the mass term of the hamiltonian this model can be interpreted as describing a firstorder phase transition for a system in a region of the ddimensional space limited by d pairs of parallel planes orthogonal to the coordinates axis x_1 x_2 x_d the planes in each pair are separated by distances l_1 l_2 l_d we obtain an expression for the transition temperature as a function of the size of the system t_cl_i i1 2 d for d3 we particularize this formula taking l_1l_2 l_dl for the physically interesting cases d1 a film d2 an infinitely long wire having a square crosssection and for d3 a cube for completeness the corresponding formulas for secondorder transitions are also presented comparison with experimental data for superconducting films and wires shows qualitative agreement with our theoretical expressions
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711.5001
Complex hyperbolic hyperplane complements
We study spaces obtained from a complete finite volume complex hyperbolic n-manifold M by removing a compact totally geodesic complex (n-1)-submanifold. The main result is that the fundamental group of M-S is relatively hyperbolic, relative to fundamental groups of the ends of M-S, and M-S admits a complete finite volume A-regular Riemannian metric of negative sectional curvature. It follows that for n>1 the fundamental group of M-S satisfies Mostow-type Rigidity, has finite asymptotic dimension and rapid decay property, satisfies Borel and Baum-Connes conjectures, is co-Hopf and residually hyperbolic, has no nontrivial subgroups with property (T), and has finite outer automorphism group. Furthermore, if M is compact, then the fundamental group of M-S is biautomatic and satisfies Strong Tits Alternative.
math.GR math.AT math.DG
we study spaces obtained from a complete finite volume complex hyperbolic nmanifold m by removing a compact totally geodesic complex n1submanifold the main result is that the fundamental group of ms is relatively hyperbolic relative to fundamental groups of the ends of ms and ms admits a complete finite volume aregular riemannian metric of negative sectional curvature it follows that for n1 the fundamental group of ms satisfies mostowtype rigidity has finite asymptotic dimension and rapid decay property satisfies borel and baumconnes conjectures is cohopf and residually hyperbolic has no nontrivial subgroups with property t and has finite outer automorphism group furthermore if m is compact then the fundamental group of ms is biautomatic and satisfies strong tits alternative
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711.5002
A nearly-optimal method to compute the truncated theta function, its derivatives, and integrals
A poly-log time method to compute the truncated theta function, its derivatives, and integrals is presented. The method is elementary, rigorous, explicit, and suited for computer implementation. We repeatedly apply the Poisson summation formula to the truncated theta function while suitably normalizing the linear and quadratic arguments after each repetition. The method relies on the periodicity of the complex exponential, which enables the suitable normalization of the arguments, and on the self-similarity of the Gaussian, which ensures that we still obtain a truncated theta function after each application of the Poisson summation. In other words, our method relies on modular properties of the theta function. Applications to the numerical computation of the Riemann zeta function and to finding the number of solutions of Waring type Diophantine equations are discussed.
math.NT
a polylog time method to compute the truncated theta function its derivatives and integrals is presented the method is elementary rigorous explicit and suited for computer implementation we repeatedly apply the poisson summation formula to the truncated theta function while suitably normalizing the linear and quadratic arguments after each repetition the method relies on the periodicity of the complex exponential which enables the suitable normalization of the arguments and on the selfsimilarity of the gaussian which ensures that we still obtain a truncated theta function after each application of the poisson summation in other words our method relies on modular properties of the theta function applications to the numerical computation of the riemann zeta function and to finding the number of solutions of waring type diophantine equations are discussed
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711.5003
Contact equations, Lipschitz extensions and isoperimetric inequalities
We characterize locally Lipschitz mappings and existence of Lipschitz extensions through a first order nonlinear system of PDEs. We extend this study to graded group-valued Lipschitz mappings defined on compact Riemannian manifolds. Through a simple application, we emphasize the connection between these PDEs and the Rumin complex. We introduce a class of 2-step groups, satisfying some abstract geometric conditions and we show that Lipschitz mappings taking values in these groups and defined on subsets of the plane admit Lipschitz extensions. We present several examples of these groups, called Allcock groups, observing that their horizontal distribution may have any codimesion. Finally, we show how these Lipschitz extensions theorems lead us to quadratic isoperimetric inequalities in all Allcock groups.
math.AP math.DG
we characterize locally lipschitz mappings and existence of lipschitz extensions through a first order nonlinear system of pdes we extend this study to graded groupvalued lipschitz mappings defined on compact riemannian manifolds through a simple application we emphasize the connection between these pdes and the rumin complex we introduce a class of 2step groups satisfying some abstract geometric conditions and we show that lipschitz mappings taking values in these groups and defined on subsets of the plane admit lipschitz extensions we present several examples of these groups called allcock groups observing that their horizontal distribution may have any codimesion finally we show how these lipschitz extensions theorems lead us to quadratic isoperimetric inequalities in all allcock groups
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711.5004
A note on lower bounds for hypergraph Ramsey numbers
We improve upon the lower bound for 3-colour hypergraph Ramsey numbers, showing, in the 3-uniform case, that \[r_3 (l,l,l) \geq 2^{l^{c \log \log l}}.\] The old bound, due to Erd\H{o}s and Hajnal, was \[r_3 (l,l,l) \geq 2^{c l^2 \log^2 l}.\]
math.CO
we improve upon the lower bound for 3colour hypergraph ramsey numbers showing in the 3uniform case that r_3 lll geq 2lc log log l the old bound due to erdhos and hajnal was r_3 lll geq 2c l2 log2 l
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711.5005
Fast methods to compute the Riemann zeta function
The Riemann zeta function on the critical line can be computed using a straightforward application of the Riemann-Siegel formula, Sch\"onhage's method, or Heath-Brown's method. The complexities of these methods have exponents 1/2, 3/8 (=0.375), and 1/3 respectively. In this paper, three new fast and potentially practical methods to compute zeta are presented. One method is very simple. Its complexity has exponent 2/5. A second method relies on this author's algorithm to compute quadratic exponential sums. Its complexity has exponent 1/3. The third method employs an algorithm, developed in this paper, to compute cubic exponential sums. Its complexity has exponent 4/13 (approximately, 0.307).
math.NT
the riemann zeta function on the critical line can be computed using a straightforward application of the riemannsiegel formula schonhages method or heathbrowns method the complexities of these methods have exponents 12 38 0375 and 13 respectively in this paper three new fast and potentially practical methods to compute zeta are presented one method is very simple its complexity has exponent 25 a second method relies on this authors algorithm to compute quadratic exponential sums its complexity has exponent 13 the third method employs an algorithm developed in this paper to compute cubic exponential sums its complexity has exponent 413 approximately 0307
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711.5006
Black hole formation and slow-roll inflation
Black hole formation may occur if the spectrum of the curvature perturbation \zeta increases strongly as the scale decreases. As no such increase is observed on cosmological scales, black hole formation requires strongly positive running n' of the spectral index n, though the running might only kick in below the `cosmological scales' probed by the CMB anisotropy and galaxy surveys. A concrete and well-motivated way of producing this running is through the running mass model of slow roll inflation. We obtain a new observational bound n' < 0.026 on the running provided by this model, improving an earlier result by a factor two. We also discuss black hole production in more general scenarios. We show that the usual conditions \epsilon << 1 and |\eta| << 1 are enough to derive the spectrum {\cal P}_{\zeta}(k), the introduction of higher order parameters \xi^{2} etc. being optional.
hep-ph astro-ph gr-qc hep-th
black hole formation may occur if the spectrum of the curvature perturbation zeta increases strongly as the scale decreases as no such increase is observed on cosmological scales black hole formation requires strongly positive running n of the spectral index n though the running might only kick in below the cosmological scales probed by the cmb anisotropy and galaxy surveys a concrete and wellmotivated way of producing this running is through the running mass model of slow roll inflation we obtain a new observational bound n 0026 on the running provided by this model improving an earlier result by a factor two we also discuss black hole production in more general scenarios we show that the usual conditions epsilon 1 and eta 1 are enough to derive the spectrum cal p_zetak the introduction of higher order parameters xi2 etc being optional
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711.5007
A bound on the exponent of the cohomology of BC-bundles
We give a lower bound for the exponent of certain elements in the integral cohomology of the total spaces of principal BC-bundles for C a finite cyclic group. As applications we give a proof of the theorem of A. Adem and H.-W. Henn that a p-group is elementary abelian if and only if its integral cohomology has exponent p, and we exhibit some infinite groups of finite virtual cohomological dimension whose Tate-Farrell cohomology contains torsion of order greater than the l.c.m. of the orders of their finite subgroups. We also give an upper bound for the exponent of all but finitely many of the integral cohomology groups of a finite group, in terms of the permutation representations of the group.
math.AT
we give a lower bound for the exponent of certain elements in the integral cohomology of the total spaces of principal bcbundles for c a finite cyclic group as applications we give a proof of the theorem of a adem and hw henn that a pgroup is elementary abelian if and only if its integral cohomology has exponent p and we exhibit some infinite groups of finite virtual cohomological dimension whose tatefarrell cohomology contains torsion of order greater than the lcm of the orders of their finite subgroups we also give an upper bound for the exponent of all but finitely many of the integral cohomology groups of a finite group in terms of the permutation representations of the group
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