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[ascl:1101.001] Second-order Tight-coupling Code

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.

Code site:
http://www.phas.ubc.ca/~francis/Codes.html
Used in:
http://adsabs.harvard.edu/abs/2011PhRvD..83j3521C
Bibcode:
2011ascl.soft01001C

Views: 1309

ascl:1101.001
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