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.
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.
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.
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.
CMB map derived from the WMAP data through harmonic internal linear combination
Jaiseung Kim, Pavel Naselsky, and Per Rex Christensen
We are presenting an internal linear combination CMB map, in which the foreground is reduced through harmonic variance minimization. We have derived our method by converting a general form of pixel-space approach into spherical harmonic space, maintaining full correspondence. By working in spherical ... [Phys. Rev. D 77, 103002 (2008)] published Mon May 12, 2008.
Surface states and the charge of a dust particle in a plasma. (arXiv:0801.0950v2 [physics.plasm-ph] UPDATED)
ePrint arXiv http://arXiv.org/
LARES approved: towards a 1% measurement of frame dragging?. (arXiv:0802.2031v6 [gr-qc] UPDATED)
ePrint arXiv http://arXiv.org/