The Cosmic Linear Anisotropy Solving System (CLASS) III: Comparision with CAMB for LambdaCDM

By Julien Lesgourgues. 2011

144 citations recorded by the source corpus.

By confronting the two independent Boltzmann codes CLASS and CAMB, we establish that for concordance cosmology and for a given recombination history, lensed CMB and matter power spectra can be computed by current codes with an accuracy of 0.01%. We list a few tiny changes in CAMB which are necessary in order to reach such a level. Using the common limit of the two codes as a set of reference spectra, we derive precision settings corresponding to fixed levels of error in the computation of a CMB likelihood. We find that for a given precision level, CLASS is about 2.5 times faster than CAMB for computing the lensed CMB spectra of a LambdaCDM model. The nature of the main improvements in CLASS (which may each contribute to these performances) is discussed in companion papers.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/99b1eeb3e43009a2fce7ce35eb25a9391460ef95

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Citations in the corpus

A buyer’s guide to the Hubble constant (2021, methodology): “The spectrum is then compared to one computed in a standard code such as CMBFAST (Seljak and Zaldarriaga 1996), CAMB (Lewis et al. 2000) or CLASS (Blas et al. 2011) and a posterior for each cosmological parameter is computed.”
hi_class: Horndeski in the Cosmic Linear Anisotropy Solving System (2016, unknown): “[85].”
Euclid preparation: VII. Forecast validation for Euclid cosmological probes (2019, methodology): “The public version of CosmoSIS provides a standard library with different modules for the Boltzmann solver, like CAMB (Lewis et al. 2000; Howlett et al. 2012), CLASS (Lesgourgues 2011a; Blas et al. 2011; Lesgourgues 2011b; Lesgourgues & Tram 2011), or MGCAMB (Zhao et al. 2009; Hojjati et al. 2011), ”
The CLASSgal code for relativistic cosmological large scale structure (2013, unknown): “ class versions. The accuracy of the calculation is similar to the one of the original class code, i.e., overall about 0.1% when using default precision, or up to 0.01% with boosted accuracy settings [30]. Whenever possible, we checked that classgal agrees well with cambsources. classgal oers the ad”
The Cosmic Linear Anisotropy Solving System (CLASS) I: Overview (2011, methodology): “The code is released together with a few precision ﬁles which have been calibrated using a rigorous process (see [11] for more details).”