Quantifying the behaviour of curvature perturbations during inflation

Details Quantifying the behaviour of curvature perturbations during inflation Quantifying the behaviour of curvature perturbations during inflation

2011-11-29

arxiv.org/abs/1111.6940v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Revtex4, 10 pages, 9 figures

Scientific paper

How much does the curvature perturbation change after it leaves the horizon, and when should one evaluate the power spectrum? To answer these questions we study single field inflation models numerically, and compare the evolution of different curvature perturbations from horizon crossing to the end of inflation. In particular we calculate the number of efolds it takes for the curvature perturbation at a given wavenumber to settle down to within a given fraction of their value at the end of inflation. We find that e.g. in chaotic inflation, the amplitude of the comoving and the curvature perturbation on uniform density hypersurfaces differ by up to 180 % at horizon crossing assuming the same amplitude at the end of inflation, and that it takes approximately 3 efolds for the curvature perturbation to be within 1 % of its value at the end of inflation.

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