Student or educator? Sign up with your school email and get 6 months of Pro free.
CoChat
Sign Up
Cited by 2,305

The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.

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

Open access
Diego Blas, Julien Lesgourgues, Thomas Tram·2011·Journal of Cosmology and Astroparticle Physics
DOI 10.1088/1475-7516/2011/07/034
Open this paper in CoChat — free account

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.

Overview

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1088/1475-7516/2011/07/034

Cites

1 of 1 references verified0 citation errors · 0 not checkable

Statistics

Verification

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Citations

Cites

Research works printed but not linked: 17

  1. 1996, A line of sight approach to cosmic microwave background anisotropies, Astrophys. J., 469, 437, 10.1086/177793 · DOI
  2. 2005, CMBEASY: an object oriented code for the cosmic microwave background, J. Cosmol. Astropart. Phys., 2005, 011, 10.1088/1475-7516/2005/10/011 · DOI
  3. 2009, Optimising Boltzmann codes for the Planck era, J. Cosmol. Astropart. Phys., 2009, 011, 10.1088/1475-7516/2009/04/011 · DOI
  4. 1970, Primeval adiabatic perturbation in an expanding universe, Astrophys. J., 162, 815, 10.1086/150713 · DOI · Paper page
  5. 1995, Cosmological perturbation theory in the synchronous and conformal Newtonian gauges, Astrophys. J., 455, 7, 10.1086/176550 · DOI · Paper page
  6. 2005, Speeding up cosmological Boltzmann codes, J. Cosmol. Astropart. Phys., 2005, 011, 10.1088/1475-7516/2005/06/011 · DOI
  7. 2011, Photons and baryons before atoms: improving the tight-coupling approximation, Phys. Rev., 83, 103521, 10.1103/PhysRevD.83.103521 · DOI
  8. 1998, Structure formation with generalized dark matter, Astrophys. J., 506, 485, 10.1086/306274 · DOI · Paper page
  9. 2011, The tight-coupling approximation for baryon acoustic oscillations, Phys. Lett., 698, 1, 10.1016/j.physletb.2011.02.058 · DOI
  10. 2005, Growth of linear perturbations before the era of the first galaxies, Mon. Not. Roy. Astron. Soc., 362, 1047, 10.1111/j.1365-2966.2005.09385.x · DOI
  11. 2007, Linear effects of perturbed recombination, Phys. Rev., 76, 063001, 10.1103/PhysRevD.76.063001 · DOI
  12. 1997, The MATLAB ODE suite, SIAM J. Sci. Comput., 18, 1, 10.1137/S1064827594276424 · DOI
  13. 2006, 10.1137/1.9780898718881 · DOI · Paper page
  14. 2010, Massive neutrinos in cosmology: analytic solutions and fluid approximation, Phys. Rev., 81, 123516, 10.1103/PhysRevD.81.123516 · DOI
  15. 2010, Erratum ibid., 82, 089901
  16. 2000, The general primordial cosmic perturbation, Phys. Rev., 62, 083508, 10.1103/PhysRevD.62.083508 · DOI
  17. 2010, Phys Rev D, 82, 089901, 10.1103/PhysRevD.82.089901 · DOI

Cited by

See all 2,305

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

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review

Data sources

Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.