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

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Diego Blas, Julien Lesgourgues, Thomas Tram·2011·Journal of Cosmology and Astroparticle Physics
DOI 10.1088/1475-7516/2011/07/034
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Abstract

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 4 to 10 5 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 ΛCDM 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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Cited by

Metadata

Authors
Blas, D., Lesgourgues, J., & Tram, T.
Venue
Journal of Cosmology and Astroparticle Physics
Publisher
IOP Publishing
Published
2011-07-01
Volume
2011
Issue
07
Pages
034-034
ISSN
  • 1475-7508 (ISSN-L)
  • 1475-7516
DOI
10.1088/1475-7516/2011/07/034
OpenAlex
W2130038292
Cited by
2,305
References
1
FWCI
15.56
Type
journal article
Language
en
Open access
bronze
Licence

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