Induced gravitational waves in a general cosmological background
General Relativity and Quantum Cosmology
2020-04-22 v3
Abstract
Gravitational waves are inevitably produced by second order terms in cosmological perturbation theory. Most notably, the so-called induced gravitational waves are a window to the small scales part of the primordial spectrum of fluctuations and a key counterpart to the primordial black hole scenario. However, semi-analytical solutions are only known for matter and radiation domination eras. In this paper, we present new analytic integral formulas for the induced gravitational waves on subhorizon scales in a general cosmological background with a constant equation of state. We also discuss applications to a peaked primordial scalar power spectrum and the primordial black hole scenario.
Cite
@article{arxiv.1912.05583,
title = {Induced gravitational waves in a general cosmological background},
author = {Guillem Domènech},
journal= {arXiv preprint arXiv:1912.05583},
year = {2020}
}
Comments
revised version