Second-order Tight-coupling Code

Details Second-order Tight-coupling Code Second-order Tight-coupling Code

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ascl.soft01001c&link_type=abstract

Astrophysics Source Code Library, record ascl:1101.001

Astronomy and Astrophysics

Astrophysics

Scientific paper

Prior to recombination photons, electrons, and atomic nuclei rapidly scattered and behaved, almost, like a single tightly-coupled photon-baryon plasma. In order to solve the cosmological perturbation equations during that time, Cosmic Microwave Background (CMB) codes use the so-called tight-coupling approximation in which the problematic terms (i.e. the source of the stiffness) are expanded in inverse powers of the Thomson Opacity. Most codes only keep the terms linear in the inverse Thomson Opacity. We have developed a second-order tight-coupling code to test the validity of the usual first-order tight-coupling code. It is based on the publicly available code CAMB.

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