An analytic approach to baryon acoustic oscillations

Details An analytic approach to baryon acoustic oscillations An analytic approach to baryon acoustic oscillations

2011-05-08

arxiv.org/abs/1105.1514v3

Phys.Rev.D84:023522,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages 6 figures, version accepted for publication in PRD (some refs. added, discussion improved)

Scientific paper

10.1103/PhysRevD.84.023522

The fitting formula for the location of the first acoustic peak in the matter power spectrum is revised. We discuss the physics that leads to baryon acoustic oscillations: the recombination history, the tight coupling approximation and the velocity overshoot effect. A new fitting formula is proposed, which is in accordance within 5% with numerical results for a suitable range of cosmological parameters, whereas previous results yield deviations of up to 20%. The crucial improvement turns out to be the accuracy of the recombination history.

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