Cosmological Perturbations at Second Order and Recombination Perturbed

Details Cosmological Perturbations at Second Order and Recombination Perturbed Cosmological Perturbations at Second Order and Recombination Perturbed

2008-12-18

arxiv.org/abs/0812.3652v1

JCAP 0908:031,2009

Astronomy and Astrophysics

Astrophysics

47 pages, 6 figures

Scientific paper

10.1088/1475-7516/2009/08/031

We derive the full set of second-order equations governing the evolution of cosmological perturbations, including the effects of the first-order electron number density perturbations, \delta_e. We provide a detailed analysis of the perturbations to the recombination history of the universe and show that a perturbed version of the Peebles effective 3-level atom is sufficient for obtaining the evolution of \delta_e for comoving wavenumbers smaller than 1Mpc^{-1}. We calculate rigorously the perturbations to the Ly\alpha escape probability and show that to a good approximation it is governed by the local baryon velocity divergence. For modes shorter than the photon diffusion scale, we find that \delta_e is enhanced during recombination by a factor of roughly 5 relative to other first-order quantities sourcing the CMB anisotropies at second order. Using these results, in a companion paper we calculate the CMB bispectrum generated during recombination.

Affiliated with

Also associated with

No associations

Rating

Cosmological Perturbations at Second Order and Recombination Perturbed does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Cosmological Perturbations at Second Order and Recombination Perturbed, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmological Perturbations at Second Order and Recombination Perturbed will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-726404