Time Drift of Cosmological Redshifts as a Test of the Copernican Principle
Jean-Philippe Uzan, Chris Clarkson, and George F. R. Ellis
We present the time drift of the cosmological redshift in a general spherically symmetric spacetime. We demonstrate that its observation would allow us to test the Copernican principle and so determine if our Universe is radially inhomogeneous, an important issue in our understanding of dark energy. ... [Phys. Rev. Lett. 100, 191303 (2008)] published Fri May 16, 2008.
A Test of the Copernican Principle
R. R. Caldwell and A. Stebbins
The blackbody nature of the cosmic microwave background (CMB) radiation spectrum is used in a modern test of the Copernican principle. The reionized universe serves as a mirror to reflect CMB photons, thereby permitting a view of ourselves and the local gravitational potential. By comparing with mea ... [Phys. Rev. Lett. 100, 191302 (2008)] published Fri May 16, 2008.
ADM canonical formalism for gravitating spinning objects
Jan Steinhoff, Gerhard Schafer, and Steven Hergt
In general relativity, systems of spinning classical particles are implemented into the canonical formalism of Arnowitt, Deser, and Misner [R. Arnowitt, S. Deser, and C. W. Misner, in Gravitation: An Introduction to Current Research, edited by L. Witten (Wiley, New York, 1962), p. 227; arXiv:gr-qc/0 ... [Phys. Rev. D 77, 104018 (2008)] published Fri May 16, 2008.
Stability of polytropes
Christian Fronsdal
This paper is an investigation of the stability of some ideal stars. It is intended as a study in general relativity, with emphasis on the coupling to matter, aimed at a better understanding of strong gravitational fields and black holes. This contrasts with the usual attitude in astrophysics, where ... [Phys. Rev. D 77, 104019 (2008)] published Fri May 16, 2008.
Magnetized Neutron-Star Mergers and Gravitational-Wave Signals
Matthew Anderson, Eric W. Hirschmann, Luis Lehner, Steven L. Liebling, Patrick M. Motl et al.
We investigate the influence of magnetic fields upon the dynamics of, and resulting gravitational waves from, a binary neutron-star merger in full general relativity coupled to ideal magnetohydrodynamics. We consider two merger scenarios: one where the stars have aligned poloidal magnetic fields and ... [Phys. Rev. Lett. 100, 191101 (2008)] published Thu May 15, 2008.
Comparison between different cosmological models
Grigoris Panotopoulos
Several cosmological models have been proposed in order to explain the current acceleration of the Universe. Recently, the normal branch of the DGP (after Dvali, Gabadadze, and Porrati) brane model with a generalized Chaplygin gas was studied as a model which can cross the phantom divide line avoidi ... [Phys. Rev. D 77, 107303 (2008)] published Thu May 15, 2008.
Large scale structure as a probe of gravitational slip
Scott F. Daniel, Robert R. Caldwell, Asantha Cooray, and Alessandro Melchiorri
A new time-dependent, scale-independent parameter, pi, is employed in a phenomenological model of the deviation from general relativity in which the Newtonian and longitudinal gravitational potentials slip apart on cosmological scales as dark energy, assumed to be arising from a new theory of gravit ... [Phys. Rev. D 77, 103513 (2008)] published Thu May 15, 2008.
Impact of Massive Neutrinos on the Nonlinear Matter Power Spectrum
Shun Saito, Masahiro Takada, and Atsushi Taruya
We present the first attempt to analytically study the nonlinear matter power spectrum for a mixed dark matter model containing neutrinos of total mass ~0.1 eV, based on cosmological perturbation theory. The suppression in the power spectrum amplitudes due to massive neutrinos is enhanced in the we ... [Phys. Rev. Lett. 100, 191301 (2008)] published Wed May 14, 2008.
Stable cosmological models driven by a free quantum scalar field
Claudio Dappiaggi, Klaus Fredenhagen, and Nicola Pinamonti
In the mathematically rigorous analysis of semiclassical Einstein equations, the renormalization of the stress-energy tensor plays a crucial role. We address such a topic in the case of a scalar field with both arbitrary mass and coupling with gravity in the hypothesis that the underlying algebraic ... [Phys. Rev. D 77, 104015 (2008)] published Wed May 14, 2008.
Modifications by the QCD transition and e[sup +]e[sup -] annihilation of the analytic spectrum of relic gravitational waves in the accelerating universe
S. Wang, Y. Zhang, T. Y. Xia, and H. X. Miao
As predicted by quantum chromodynamics (QCD), at around T~190 MeV in the early Universe, the QCD transition occurs during which the quarks are combined into the massive hadrons. This process reduces the effective relativistic degree of freedom and causes a change in the expansion behavior of the Un ... [Phys. Rev. D 77, 104016 (2008)] published Wed May 14, 2008.
Slow decay of magnetic fields in open Friedmann universes
John D. Barrow and Christos G. Tsagas
Magnetic fields in Friedmann universes can experience superadiabatic growth without departing from conventional electromagnetism. The reason is the relativistic coupling between vector fields and spacetime geometry, which slows down the decay of large-scale magnetic fields in open universes, compare ... [Phys. Rev. D 77, 107302 (2008)] published Wed May 14, 2008.
Do Newton's G and Milgrom's a[sub 0] vary with cosmological epoch?
Jacob D. Bekenstein and Eva Sagi
In the scalar-tensor gravitational theories Newton's constant G evolves in the expanding universe. Likewise, it has been speculated that the acceleration scale [fraktur a] in Milgrom's modified Newtonian dynamics is tied to the scale of the cosmos, and must thus evolve. With the advent of relativist ... [Phys. Rev. D 77, 103512 (2008)] published Wed May 14, 2008.
Template bank for gravitational waveforms from coalescing binary black holes: Nonspinning binaries
P. Ajith, S. Babak, Y. Chen, M. Hewitson, B. Krishnan et al.
Gravitational waveforms from the inspiral and ring-down stages of the binary black-hole coalescences can be modeled accurately by approximation/perturbation techniques in general relativity. Recent progress in numerical relativity has enabled us to model also the nonperturbative merger phase of the ... [Phys. Rev. D 77, 104017 (2008)] published Wed May 14, 2008.
A topos foundation for theories of physics: IV. Categories of systems
A. Doring and C. J. Isham
This paper is the fourth in a series whose goal is to develop a fundamentally new way of building theories of physics. The motivation comes from a desire to address certain deep issues that arise in the quantum theory of gravity. Our basic contention is that constructing a theory of physics is equiv ... [J. Math. Phys. 49, 053518 (2008)] published Tue May 13, 2008.
The river model of black holes
Andrew J. S. Hamilton and Jason P. Lisle
We present a lesser known way to conceptualize stationary black holes, which we call the river model. In this model, space flows like a river through a flat background, while objects move through the river according to the rules of special relativity. In a spherical black hole, the river of space fa ... [Am. J. Phys. 76, 519 (2008)] published Mon May 12, 2008.
Spectra of primordial fluctuations in two-perfect-fluid regular bounces
Fabio Finelli, Patrick Peter, and Nelson Pinto-Neto
We introduce analytic solutions for a class of two components bouncing models, where the bounce is triggered by a negative energy density perfect fluid. The equation of state of the two components are constant in time, but otherwise unrelated. By numerically integrating regular equations for scalar ... [Phys. Rev. D 77, 103508 (2008)] published Mon May 12, 2008.
de Sitter thermodynamics: A glimpse into nonequilibrium
Rodrigo Aros
In this article it is shown that the thermodynamical evolution of a Schwarzschild de Sitter space is the evaporation of its black hole. The result is extended in higher dimensions to Lovelock theories of gravity with a single positive cosmological constant. ... [Phys. Rev. D 77, 104013 (2008)] published Mon May 12, 2008.
Generating gravity waves with matter and electromagnetic waves
C. Barrabes and P A. Hogan
If a homogeneous plane lightlike shell collides head on with a homogeneous plane electromagnetic shock wave having a step-function profile then no backscattered gravitational waves are produced. We demonstrate, by explicit calculation, that if the matter is accompanied by a homogeneous plane electro ... [Phys. Rev. D 77, 104014 (2008)] published Mon May 12, 2008.
Remark on orbital precession due to central-force perturbations
O. I. Chashchina and Z. K. Silagadze
We show that the main result of the recent paper by G. S. Adkins and J. McDonnell, Phys. Rev. D 75, 082001 (2007), the formula for the precession of Keplerian orbits induced by central-force perturbations, can be obtained very simply by the use of Hamilton's vector. ... [Phys. Rev. D 77, 107502 (2008)] published Mon May 12, 2008.
Quantum reference frames and deformed symmetries
Florian Girelli and David Poulin
In the context of constrained quantum mechanics, reference systems are used to construct relational observables that are invariant under the action of the symmetry group. Upon measurement of a relational observable, the reference system undergoes an unavoidable measurement back-action that modifies ... [Phys. Rev. D 77, 104012 (2008)] published Mon May 12, 2008.
On global properties of certain homogeneous exact solutions of Einstein field equations
M. Ulanovskii
The aim of this paper is an application of some general results on homogeneous Lorentz manifolds to exact solutions of Einstein field equations. We study the relation < of a chronological sequence of events. We examine a number of known solutions and show that in all but one, the relation < is maxim ... [J. Math. Phys. 49, 052502 (2008)] published Fri May 9, 2008.
Conformally Invariant "Massless" Spin-2 Field in de Sitter Universe. (arXiv:0805.2227v1 [gr-qc])
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The relativity of hyperbolic space. (arXiv:0805.2240v1 [physics.gen-ph])
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Singular fate of the universe in modified theories of gravity. (arXiv:0805.2284v1 [gr-qc])
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Comment to ''On Anisotropic Dark Energy Stars''. (arXiv:0805.2309v1 [gr-qc])
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Exotic Statistics for Ordinary Particles in Quantum Gravity. (arXiv:0805.2373v1 [gr-qc])
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Current status of the CLIO project. (arXiv:0805.2384v1 [gr-qc])
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Parametric instabilities in the LCGT arm cavity. (arXiv:0805.2385v1 [gr-qc])
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Effect of energy deposited by cosmic-ray particles on interferometric gravitational wave detectors. (arXiv:0805.2387v2 [gr-qc])
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Ineffectiveness of Pad\'e resummation techniques in post-Newtonian approximations. (arXiv:0805.2390v1 [gr-qc])
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Implementation of standard testbeds for numerical relativity. (arXiv:0709.3559v3 [gr-qc] UPDATED)
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Stochastic Inflation and Dimensional Reduction. (arXiv:0805.1998v2 [gr-qc] UPDATED)
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A brief survey of the renormalizability of four dimensional gravity for generalized Kodama states. (arXiv:0805.1893v2 [gr-qc] UPDATED)
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Locality inside black holes violates the second law of thermodynamics. (arXiv:0801.4415v2 [gr-qc] UPDATED)
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Thermodynamic curvature and phase transitions in Kerr-Newman black holes. (arXiv:0802.1326v2 [gr-qc] UPDATED)
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LARES approved: towards a 1% measurement of frame dragging?. (arXiv:0802.2031v6 [gr-qc] UPDATED)
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Gravitational Radiation from Primordial Helical MHD Turbulence. (arXiv:0802.3524v2 [astro-ph] UPDATED)
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How to Distinguish Dark Energy and Modified Gravity?. (arXiv:0803.3292v3 [astro-ph] UPDATED)
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Effective Field Theory for Inflation. (arXiv:0804.4291v2 [hep-th] UPDATED)
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Entanglement of Quantum Fluctuations in the Inflationary Universe. (arXiv:0805.1471v2 [gr-qc] UPDATED)
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Finite states in 4 quantized dimensional gravity. The anisotropic minisuperspace Ashtekar--Klein--Gordon model (Part I). (arXiv:0805.1892v2 [gr-qc] UPDATED)
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Uniqueness theorem for stationary black ring solution of $\sigma$-models in five dimensions. (arXiv:0805.1982v1 [hep-th] CROSS LISTED)
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