Curvature and isocurvature perturbations in two-field inflation
High Energy Physics - Theory
2009-11-13 v2 Astrophysics
General Relativity and Quantum Cosmology
Abstract
We study cosmological perturbations in two-field inflation, allowing for non-standard kinetic terms. We calculate analytically the spectra of curvature and isocurvature modes at Hubble crossing, up to first order in the slow-roll parameters. We also compute numerically the evolution of the curvature and isocurvature modes from well within the Hubble radius until the end of inflation. We show explicitly for a few examples, including the recently proposed model of `roulette' inflation, how isocurvature perturbations affect significantly the curvature perturbation between Hubble crossing and the end of inflation.
Keywords
Cite
@article{arxiv.0704.0212,
title = {Curvature and isocurvature perturbations in two-field inflation},
author = {Z. Lalak and D. Langlois and S. Pokorski and K. Turzynski},
journal= {arXiv preprint arXiv:0704.0212},
year = {2009}
}
Comments
29 pages, 12 figures; v2: updated references, discussion extended, matches the published version