Super-horizon perturbations and preheating
Astrophysics
2009-10-31 v1
Abstract
We discuss the evolution of linear perturbations about a Friedmann-Robertson-Walker background metric, using only the local conservation of energy-momentum. We show that on sufficiently large scales the curvature perturbation on spatial hypersurfaces of uniform-density is constant when the non-adiabatic pressure perturbation is negligible. We clarify the conditions under which super-horizon curvature perturbations may vary, using preheating as an example.
Cite
@article{arxiv.astro-ph/0010639,
title = {Super-horizon perturbations and preheating},
author = {Karim A. Malik and D. Wands and D. H. Lyth and A. R. Liddle},
journal= {arXiv preprint arXiv:astro-ph/0010639},
year = {2009}
}
Comments
4 pages, talk presented at "Cosmology and Particle Physics 2000", Verbier (Switzerland), 17-28 July 2000