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New Sources of Gravitational Waves During Inflation

Description: We point out that detectable inflationary tensor modes can be generated by particle or string sources produced during inflation, consistently with the requirements for inflation and constraints from scalar fluctuations. We show via examples that this effect can dominate over the contribution from quantum fluctuations of the metric, occurring even when the inflationary potential energy is too low to produce a comparable signal. Thus a detection of tensor modes from inflation does not automatical… more
Date: February 15, 2012
Creator: Senatore, Leonardo; Silverstein, Eva; /Stanford U., Phys. Dept. /SLAC; Zaldarriaga, Matias & /Princeton, Inst. Advanced Study
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Partner: UNT Libraries Government Documents Department
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Parametrization and Classification of 20 Billion LSST Objects: Lessons from SDSS

Description: The Large Synoptic Survey Telescope (LSST) will be a large, wide-field ground-based system designed to obtain, starting in 2015, multiple images of the sky that is visible from Cerro Pachon in Northern Chile. About 90% of the observing time will be devoted to a deep-wide-fast survey mode which will observe a 20,000 deg{sup 2} region about 1000 times during the anticipated 10 years of operations (distributed over six bands, ugrizy). Each 30-second long visit will deliver 5{sigma} depth for point… more
Date: November 10, 2011
Creator: Ivezic, Z.; /Washington U., Seattle, Astron. Dept.; Axelrod, T.; /Large Binocular Telescope, Tucson; Becker, A. C.; /Washington U., Seattle, Astron. Dept. et al.
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Holographic Gauge Mediation

Description: We discuss gravitational backgrounds where supersymmetry is broken at the end of a warped throat, and the SUSY-breaking is transmitted to the Standard Model via gauginos which live in (part of) the bulk of the throat geometry. We find that the leading effect arises from splittings of certain 'messenger mesons,' which are adjoint KK-modes of the D-branes supporting the Standard Model gauge group. This picture is a gravity dual of a strongly coupled field theory where SUSY is broken in a hidden s… more
Date: June 19, 2009
Creator: Benini, Francesco; U., /Princeton; Dymarsky, Anatoly; /Stanford U., ITP; Franco, Sebastian; /Santa Barbara, KITP et al.
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Computational Eulerian Hydrodynamics and Galilean Invariance

Description: Eulerian hydrodynamical simulations are a powerful and popular tool for modeling fluids in astrophysical systems. In this work, we critically examine recent claims that these methods violate Galilean invariance of the Euler equations. We demonstrate that Eulerian hydrohynamics methods do converge to a Galilean-invariant solution,provided a well-defined convergent solutions exists. Specifically, we show that numerical diffusion, resulting from diffusion-like terms in the discretized hydrodynamic… more
Date: July 10, 2013
Creator: Robertson, Brant E.; Kravtsov, Andrey V.; /Chicago U., KICP /Chicago U., Astron. Astrophys. Ctr.; Gnedin, Nickolay Y.; /Chicago U., KICP /Fermilab; Abel, Tom et al.
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(Small) Resonant non-Gaussianities: Signatures of a Discrete Shift Symmetry in the Effective Field Theory of Inflation

Description: We apply the Effective Field Theory of Inflation to study the case where the continuous shift symmetry of the Goldstone boson {pi} is softly broken to a discrete subgroup. This case includes and generalizes recently proposed String Theory inspired models of Inflation based on Axion Monodromy. The models we study have the property that the 2-point function oscillates as a function of the wavenumber, leading to oscillations in the CMB power spectrum. The non-linear realization of time diffeomorph… more
Date: June 6, 2012
Creator: Behbahani, Siavosh R.; /SLAC /Stanford U., Phys. Dept. /Boston U.; Dymarsky, Anatoly; /Princeton, Inst. Advanced Study; Mirbabayi, Mehrdad; /New York U., CCPP /New York U. et al.
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GLAST And Dark Matter Substructure in the Milky Way

Description: We discuss the possibility of GLAST detecting gamma-rays from the annihilation of neutralino dark matter in the Galactic halo. We have used 'Via Lactea', currently the highest resolution simulation of cold dark matter substructure, to quantify the contribution of subhalos to the annihilation signal. We present a simulated allsky map of the expected gamma-ray counts from dark matter annihilation, assuming standard values of particle mass and cross section. In this case GLAST should be able to de… more
Date: November 29, 2011
Creator: Kuhlen, Michael; /Princeton, Inst. Advanced Study; Diemand, Jurg; /UC, Santa Cruz, Astron. Astrophys.; Madau, Piero & /UC, Santa Cruz, Astron. Astrophys. /Garching, Max Planck Inst.
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Partner: UNT Libraries Government Documents Department
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Axions in String Theory

Description: In the context of string theory, axions appear to provide the most plausible solution of the strong CP problem. However, as has been known for a long time, in many string-based models, the axion coupling parameter Fa is several orders of magnitude higher than the standard cosmological bounds. We re-examine this problem in a variety of models, showing that Fa is close to the GUT scale or above in many models that have GUT-like phenomenology, as well as some that do not. On the other hand, in som… more
Date: June 9, 2006
Creator: Svrcek, Peter; /Stanford U., Phys. Dept. /SLAC; Witten, Edward & /Princeton, Inst. Advanced Study
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Partner: UNT Libraries Government Documents Department
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RAM: a Relativistic Adaptive Mesh Refinement Hydrodynamics Code

Description: The authors have developed a new computer code, RAM, to solve the conservative equations of special relativistic hydrodynamics (SRHD) using adaptive mesh refinement (AMR) on parallel computers. They have implemented a characteristic-wise, finite difference, weighted essentially non-oscillatory (WENO) scheme using the full characteristic decomposition of the SRHD equations to achieve fifth-order accuracy in space. For time integration they use the method of lines with a third-order total variati… more
Date: June 6, 2005
Creator: Zhang, Wei-Qun; /KIPAC, Menlo Park; MacFadyen, Andrew I. & /Princeton, Inst. Advanced Study
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Partner: UNT Libraries Government Documents Department
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A Compact Binary Merger Model for the Short, Hard GRB 050509b

Description: The first X-ray afterglow for a short ({approx}30ms), hard {gamma}-ray burst was detected by Swift on 9 May 2005 (GRB 050509b). No optical or radio counterpart was identified in follow-up observations. The tentative association of the GRB with a nearby giant elliptical galaxy at redshift z = 0.2248 would imply the progenitor had traveled several tens of kpc from its point of origin, in agreement with expectations linking these events to the final merger of compact binaries driven by gravitation… more
Date: June 15, 2005
Creator: Lee, William H.; /Princeton, Inst. Advanced Study /UNAM, Inst. Astron.; Ramirez-Ruiz, Enrico; /Princeton, Inst. Advanced Study; Granot, Jonathan & /Princeton, Inst. Advanced Study /KIPAC, Menlo Park
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