The structure of correlation functions in single field inflationMany statistics available to constrain non-Gaussianity from inflation are simplest to use under the assumption that the curvature correlation functions are hierarchical. That is, if the n-point…Sarah Shandera·Dec 3, 2008SaveLearn
Constraints on the Size of Extra Dimensions from the Orbital Evolution of the Black-Hole X-Ray Binary XTE J1118+480In a universe of the Randall-Sundrum type, black holes are unstable and emit gravitational modes in the extra dimension. This leads to dramatically shortened lifetimes of astrophysical black holes…Tim Johannsen·Dec 3, 2008SaveLearn
Comparison of spectral slopes of magnetohydrodynamic and hydrodynamic turbulence and measurements of alignment effectsWe performed a series of high-resolution (up to 10243) direct numerical simulations of hydro and MHD strong turbulence. We found that for simulations with normal viscosity the slopes for spectra of…Andrey Beresnyak, Alex Lazarian·Dec 3, 2008SaveLearn
Revisiting the confrontation of the energy conditions with supernovae dataIn the standard Friedmann-Lemaitre-Robertson-Walker (FLRW) approach to model the Universe the violation of the so-called energy conditions is related to some important properties of the Universe as,…M. P. Lima, S. D. P. Vitenti, M. J. Reboucas·Dec 3, 2008SaveLearn
Backgrounds and Projected Limits from Dark Matter Direct Detection ExperimentsA simple formula is introduced which indicates the amount by which projections of dark matter direct detection experiments are expected to be degraded due to backgrounds.Scott Dodelson·Dec 3, 2008SaveLearn
INTEGRAL observation of hard X-ray variability of the TeV binary LS5039 / RX J1826.2-1450LS 5039/RX J1826.2-1450 is one of the few High Mass X-ray binary systems from which radio and high energy TeV emission has been observed. Moreover, variability of the TeV emission with orbital period…A. D. Hoffmann, D. Klochkov, A. Santangelo et al.·Dec 3, 2008SaveLearn
Stars and dark matter in the spiral gravitational lens 2237+0305We construct a mass model for the spiral lens galaxy 2237+0305, at redshift zl=0.04, based on gravitational-lensing constraints, HI rotation, and new stellar-kinematic information, based on data…C. M. Trott, T. Treu, L. V. E. Koopmans et al.·Dec 3, 2008SaveLearn
Variation of the subhalo abundance in dark matter halosWe analyzed the statistics of subhalo abundance of galaxy-sized and giant-galaxy-sized halos formed in a high-resolution cosmological simulation of a 46.5Mpc cube with the uniform mass resolution of…Tomoaki Ishiyama, Toshiyuki Fukushige, Junichiro Makino·Dec 3, 2008SaveLearn
f(R) gravity theories in the Palatini Formalism constrained from strong lensingf(R) gravity, capable of driving the late-time acceleration of the universe, is emerging as a promising alternative to dark energy. Various f(R) gravity models have been intensively tested…Xin-Juan Yang, Da-Ming Chen·Dec 3, 2008SaveLearn
The Seventh Data Release of the Sloan Digital Sky SurveyThis paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDSS-II. It includes…K. Abazajian·Dec 3, 2008SaveLearn
Gamma Rays from Clusters and Groups of Galaxies: Cosmic Rays versus Dark MatterClusters of galaxies have not yet been detected at gamma-ray frequencies; however, the recently launched Fermi Gamma-ray Space Telescope, formerly known as GLAST, could provide the first detections…Tesla E. Jeltema, John Kehayias, Stefano Profumo·Dec 3, 2008SaveLearn
The Role of Gas In Maintaining Quasi-Steady Spiral Structure In Stellar DisksWe study the dynamical evolution of spiral structure in the stellar disks of isolated galaxies using high resolution Smoothed Particle Hydrodynamics (SPH) simulations that treat the evolution of gas,…Sukanya Chakrabarti·Dec 3, 2008SaveLearn
Growth of Magnetic Fields Induced by Turbulent MotionsWe present numerical simulations of driven magnetohydrodynamic (MHD) turbulence with weak/moderate imposed magnetic fields. The main goal is to clarify dynamics of magnetic field growth. We also…J. Cho, E. Vishniac, A. Beresnyak et al.·Dec 3, 2008SaveLearn
Grain Alignment by Radiative TorquesGrain alignment is a notoriously difficult problem, that is extremely rich in underlying physics. The long history of attempts theoretical handling of the problem resulted in rather sceptical…A. Lazarian·Dec 3, 2008SaveLearn
AzTEC Millimetre Survey of the COSMOS Field - II. Source Count Overdensity and Correlations with Large-Scale StructureWe report an over-density of bright sub-millimetre galaxies (SMGs) in the 0.15 sq. deg. AzTEC/COSMOS survey and a spatial correlation between the SMGs and the optical-IR galaxy density at z <~ 1.1.…J. E. Austermann, I. Aretxaga, D. H. Hughes et al.·Dec 3, 2008SaveLearn
325-MHz observations of the ELAIS-N1 field using the Giant Metrewave Radio TelescopeWe present observations of the European Large-Area ISO Survey-North 1 (ELAIS-N1) at 325 MHz using the Giant Metrewave Radio Telescope (GMRT), with the ultimate objective of identifying active…S. K. Sirothia, M . Dennefeld, D. J. Saikia et al.·Dec 3, 2008SaveLearn
Long term optical and X-ray variability of the Seyfert galaxy Markarian 79We present the results of concurrent X-ray and optical monitoring of the Seyfert 1 galaxy Mrk 79 over a period of more than five years. We find that on short to medium time-scales (days to a few tens…E. Breedt, P. Arévalo, I. M. McHardy et al.·Dec 3, 2008SaveLearn
Galactic Bars in Cosmological ContextGalactic disks can form in asymmetric potentials of the assembling dark matter (DM) halos, giving rise to the first generation of gas-rich bars. Properties of these bars differ from canonical bars…Isaac Shlosman·Dec 3, 2008SaveLearn
The Elliptical-Spheroidal and Elliptical-Elliptical Galaxy DichotomiesThis paper summarizes Kormendy et al. (2009, ApJS, in press, arXiv:0810.1681). We confirm that spheroidal galaxies have fundamental plane correlations that are almost perpendicular to those for…John Kormendy·Dec 3, 2008SaveLearn
Galactic constraints on CHAMPsWe improve earlier Galactic bounds that can be placed on the fraction of dark matter in charged elemental particles (CHAMPs). These constraints are of interest for CHAMPs whose mass is too large for…F. J. Sanchez-Salcedo, E. Martinez-Gomez·Dec 3, 2008SaveLearn
Section on Prospects for Dark Matter Detection of the White Paper on the Status and Future of Ground-Based TeV Gamma-Ray AstronomyThis is a report on the findings of the dark matter science working group for the white paper on the status and future of TeV gamma-ray astronomy. The white paper was commissioned by the American…J. Buckley, E. A. Baltz, G. Bertone et al.·Dec 3, 2008SaveLearn
Section on Extragalactic Science Topics of the White Paper on the Status and Future of Ground-Based TeV Gamma-Ray AstronomyThis is a report on the findings of the extragalactic science working group for the white paper on the status and future of TeV gamma-ray astronomy. The white paper was commissioned by the American…H. Krawczynski, A. M. Atoyan, M. Beilicke et al.·Dec 3, 2008SaveLearn
The white dwarf in dwarf nova SDSS J080434.20+510349.2: Entering the instability strip?SDSS J080434.20+510349.2 is the WZ type binary that displayed rare outburst in 2006 (Pavlenko et al., 2007). During the long-lasting tail of the late stage of the outburst binary shown the two-humped…Pavlenko Elena·Dec 3, 2008SaveLearn
Characterization of the HD 17156 planetary systemAIMS : To improve the parameters of the HD 17156 system (peculiar due to the eccentric and long orbital period of its transiting planet) and constrain the presence of stellar companions. METHODS :…M. Barbieri, R. Alonso, S. Desidera et al.·Dec 3, 2008SaveLearn
Calibration of the Gamma-RAy Polarimeter Experiment (GRAPE) at a Polarized Hard X-Ray BeamThe Gamma-RAy Polarimeter Experiment (GRAPE) is a concept for an astronomical hard X-ray Compton polarimeter operating in the 50 - 500 keV energy band. The instrument has been optimized for…P. F. Bloser, J. S. Legere, M. L. McConnell et al.·Dec 3, 2008SaveLearn