Supersymmetric flat direction decay: The prospect of particle production and preheating investigated in the unitary gauge
Anders Basboll
We look at the possibility of nonperturbative particle production after inflation from supersymmetry flat directions produced by rotating eigenstates thereby avoiding the standard adiabaticity conditions. This might lead to preheating and prevent the delay of thermalization of the Universe. We inves ... [Phys. Rev. D 78, 023528 (2008)] published Wed Jul 23, 2008.
Statistical properties of the linear tidal shear
Vincent Desjacques and Robert E. Smith
Large-scale structures originate from coherent motions induced by inhomogeneities in the primeval gravitational potential. Here, we investigate the two-point statistics of the second derivative of the potential, the tidal shear, under the assumption of Gaussianity. We derive an exact closed form exp ... [Phys. Rev. D 78, 023527 (2008)] published Tue Jul 22, 2008.
Symmetries and metrics of homogeneous cosmologies
M. A. Melvin and T. R. Michalik
It is shown that an assumption of ''historical homogeneity''or the persistence of spatial homogeneity in timeleads to the synchronous (time-orthogonal) form ds=dt+gamma (t)epsilon[direct-product]epsilon, of the metrics for general spatially homogeneous (Bianchi) cosmologies. The epsilon are group-re ... [J. Math. Phys. 21, 1938 (2008)] published Mon Jul 21, 2008.
Analytic model for the bispectrum of galaxies in redshift space
Robert E. Smith, Ravi K. Sheth, and Roman Scoccimarro
We develop an analytic theory for the redshift space bispectrum of dark matter, haloes, and galaxies. This is done within the context of the halo model of structure formation, as this allows for the self-consistent inclusion of linear and nonlinear redshift-space distortions and also for the nonline ... [Phys. Rev. D 78, 023523 (2008)] published Fri Jul 18, 2008.
Stationary rotating strings as relativistic particle mechanics
Kouji Ogawa, Hideki Ishihara, Hiroshi Kozaki, Hiroyuki Nakano, and Shinya Saito
Stationary rotating strings can be viewed as geodesic motions in appropriate metrics in two-dimensional space. We obtain all solutions describing stationary rotating strings in flat spacetime as an application. These rotating strings have infinite length with various wiggly shapes. Averaged value of ... [Phys. Rev. D 78, 023525 (2008)] published Fri Jul 18, 2008.
Torsion cosmology and the accelerating universe
Kun-Feng Shie, James M. Nester, and Hwei-Jang Yo
Investigations of the dynamic modes of the Poincare gauge theory of gravity found only two good propagating torsion modes; they are effectively a scalar and a pseudoscalar. Cosmology affords a natural situation where one might see observational effects of these modes. Here, we consider only the scal ... [Phys. Rev. D 78, 023522 (2008)] published Fri Jul 18, 2008.
Anisotropic scaling of magnetohydrodynamic turbulence. (arXiv:0807.3713v1 [physics.plasm-ph])
ePrint arXiv http://arXiv.org/
Nonlinear finite-Larmor-radius effects in reduced fluid models. (arXiv:0807.3680v1 [physics.plasm-ph])
ePrint arXiv http://arXiv.org/