Université de GenèveDépartement de Physique ThéoriqueCAP Genève

An analytic approach to baryon acoustic oscillations

7. July 2011
Cite as: 
F. Montanari, R. Durrer, Phys. Rev. D84 (2011) 023522 [arXiv:1105.1514].
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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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