Enhanced polarization of CMB from thermal gravitational waves
Astrophysics
2008-11-26 v3 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
If inflation was preceded by a radiation era then at the time of inflation there will exist a decoupled thermal distribution of gravitons. Gravitational waves generated during inflation will be amplified by the process of stimulated emission into the existing thermal distribution of gravitons. Consequently the usual zero temperature scale invariant tensor spectrum is modified by a temperature dependent factor. This thermal correction factor amplify the -mode polarization of the CMB by an order of magnitude at large angles, which may now be in the range of observability of WMAP.
Cite
@article{arxiv.astro-ph/0607049,
title = {Enhanced polarization of CMB from thermal gravitational waves},
author = {Kaushik Bhattacharya and Subhendra Mohanty and Akhilesh Nautiyal},
journal= {arXiv preprint arXiv:astro-ph/0607049},
year = {2008}
}
Comments
5 pages, 1 figure, Revtex file. Some minor corrections included, some new references introduced. Accepted for publication in Physical Review Letters