%0 Journal Article
%T Second-Order Corrections to the Power Spectrum in the Slow-Roll Expansion with a Time-Dependent Sound Speed
%A Hao Wei
%A Rong-Gen Cai
%A Anzhong Wang
%J Physics
%D 2004
%I arXiv
%R 10.1016/j.physletb.2004.10.034
%X We extend Green's function method developed by Stewart and Gong to calculate the power spectrum of density perturbation in the case with a time-dependent sound speed, and explicitly give the power spectrum and spectral index up to second-order corrections in the slow-roll expansion. The case of tachyon inflation is included as a special case.
%U http://arxiv.org/abs/hep-th/0409130v3