The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes

Details The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes

2011-04-14

arxiv.org/abs/1104.2933v3

JCAP 07 (2011) 034

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

35 pages, 10 figures, 5 tables. Ultra-relativistic fluid approximation better justified in a new Appendix B. Version accepted

Scientific paper

Boltzmann codes are used extensively by several groups for constraining cosmological parameters with Cosmic Microwave Background and Large Scale Structure data. This activity is computationally expensive, since a typical project requires from 10'000 to 100'000 Boltzmann code executions. The newly released code CLASS (Cosmic Linear Anisotropy Solving System) incorporates improved approximation schemes leading to a simultaneous gain in speed and precision. We describe here the three approximations used by CLASS for basic LambdaCDM models, namely: a baryon-photon tight-coupling approximation which can be set to first order, second order or to a compromise between the two; an ultra-relativistic fluid approximation which had not been implemented in public distributions before; and finally a radiation streaming approximation taking reionisation into account.

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