ar X iv : a st ro - p h / 03 06 30 4 v 2 5 O ct 2 00 3 UTTG - 02 - 03 Damping of Tensor Modes in Cosmology Steven

ar X iv : a st ro - p h / 03 06 30 4 v 1 1 6 Ju n 20 03 UTTG - 02 - 03 Damping of Tensor Modes in Cosmology

An analytic formula is given for the traceless transverse part of the anisotropic stress tensor due to free streaming neutrinos, and used to derive an integro-differential equation for the propagation of cosmological gravitational waves. The solution shows that anisotropic stress reduces the squared amplitude by a factor 0.644 for wavelengths that enter the horizon during the radiation-dominate...

ar X iv : a st ro - p h / 03 06 44 3 v 1 2 3 Ju n 20 03 MAGNETIC FIELDS IN COSMOLOGY

Different mechanisms which may possibly explain existence of magnetic fields on astronomically large scales are described. A recently suggested model of magnetic fields generation slightly before hydrogen recombination is discussed in more detail.

ar X iv : a st ro - p h / 02 04 03 6 v 1 2 A pr 2 00 2 Investigating the Flame Microstructure in Type

ar X iv : h ep - p h / 03 06 05 3 v 3 9 O ct 2 00 3 Revised October 2003 MSSM from AdS / CFT

We develop a robust version of the MSSM from a Z12 orbifolded AdS/CFT, with natural low scale unification and briefly discuss cosmology in this testable model. Typeset using REVTEX 1

ar X iv : a st ro - p h / 02 10 03 7 v 1 1 O ct 2 00 2 From Spirals to Low Surface Brightness galaxies

We show that simple models of the chemical and spectrophotometric evolution of galaxies can be used to explore the properties of present-day galaxies and especially the causes of the observed variety among disc galaxies. We focus on the link between " classical " spirals and Low Surface Brightness galaxies.