Suppression of the large scale curvature perturbation by interacting fluids
arXiv:astro-ph/0609019 · doi:10.1016/j.physletb.2007.03.008
Abstract
The large-scale dynamics of a two-fluid system with a time dependent interaction is studied analytically and numerically. We show how a rapid transition can significantly suppress the large-scale curvature perturbation and present approximative formulae for estimating the effect. By comparing to numerical results, we study the applicability of the approximation and find good agreement with exact calculations.
7 pages, 4 figures. v2: Significant revisions: conclusion changed, references added, figures replaced