Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-06-02
Phys.Rev.D68:083507,2003
Astronomy and Astrophysics
Astrophysics
8 pages, 4 figures, submitted to PRD, new version of CMBFAST can be found at http://www.cmbfast.org
Scientific paper
10.1103/PhysRevD.68.083507
We compare three independent, cosmological linear perturbation theory codes to asses the level of agreement between them and to improve upon it by investigating the sources of discrepancy. By eliminating the major sources of numerical instability the final level of agreement between the codes was improved by an order of magnitude. The relative error is now below 0.1% for the dark matter power spectrum. For the cosmic microwave background anisotropies the agreement is below the sampling variance up to l=3000, with close to 0.1% accuracy reached over most of this range of scales. The same level of agreement is also achieved for the polarization spectrum and the temperature-polarization cross-spectrum. Linear perturbation theory codes are thus well prepared for the present and upcoming high precision cosmological observations.
Seljak Uros
Sugiyama Naoshi
White Martin
Zaldarriaga Matias
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