Fermion production from preheating-amplified metric perturbations
高能物理 - 唯象学
2011-07-19 v2 天体物理学
广义相对论与量子宇宙学
高能物理 - 理论
摘要
We study gravitational creation of light fermions in the presence of classical scalar metric perturbations about a flat Friedmann-Lemaitre- Robertson-Walker (FLRW) background. These perturbations can be large during preheating, breaking the conformal flatness of the background spacetime. We compute numerically the total number of particles generated by the modes of the metric perturbations which have grown sufficiently to become classical. In the absence of inhomogeneities massless fermions are not gravitationally produced, and then this effect may be relevant for abundance estimates of light gravitational relics.
引用
@article{arxiv.hep-ph/0109176,
title = {Fermion production from preheating-amplified metric perturbations},
author = {Bruce A. Bassett and Marco Peloso and Lorenzo Sorbo and Shinji Tsujikawa},
journal= {arXiv preprint arXiv:hep-ph/0109176},
year = {2011}
}
备注
17 pages, 7 figures, accepted for publication in Nuclear Physics B