2011/05/31 by Francesco Montanari, Ruth Durrer · 14 citations
Engineering · Mathematics · Physics and Astronomy · #Baryon #Baryon acoustic oscillations #Black Holes and Theoretical Physics #Computational physics #Computer science #Cosmology #Cosmology and Gravitation Theories #Coupling (piping) #Dark energy #Engineering #Galaxies: Formation, Evolution, Phenomena #Mathematics #Overshoot (microwave communication) #Particle physics #Physics #Quantum electrodynamics #Quantum mechanics #Range (aeronautics) #Spectral density #Spectrum (functional analysis) #Statistical physics #Statistics #Yield (engineering) #astro-ph.CO #gr-qc
paper · pdf · doi:10.1103/physrevd.84.023522
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 84(2) (American Physical Society) · 8 pages 6 figures, version accepted for publication in PRD (some refs. added, discussion improved)
arxiv created 2011/07/07 · openalex publication_date 2011/07/25 · arxiv updated 2011/07/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 (15--20)%. The crucial improvement turns out to be the accuracy of the recombination history.