2014/11/05 by Nuala McCullagh, Alexander S. Szalay
Physics and Astronomy · #Baryon #Baryon acoustic oscillations #Cosmology and Gravitation Theories #Dark energy #Nonlinear system #Particle physics theoretical and experimental studies #Perturbation (astronomy) #Perturbation theory (quantum mechanics) #Pulsars and Gravitational Waves Research #Redshift #Redshift-space distortions #Space (punctuation) #astro-ph.CO
paper · pdf · doi:10.1088/0004-637x/798/2/137
8 pages; Accepted by Astrophysical Journal
arxiv created 2014/11/05 · openalex publication_date 2015/01/08 · arxiv updated 2015/06/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
Baryon acoustic oscillations (BAO) are a powerful probe of the expansion history of the universe, which can tell us about the nature of dark energy. In order to accurately characterize the dark energy equation of state using BAO, we must understand the effects of both nonlinearities and redshift space distortions on the location and shape of the acoustic peak. In a previous paper, we introduced a novel approach to second order perturbation theory in configuration space using the Zel'dovich approximation, and presented a simple result for the first nonlinear term of the correlation function. In this paper, we extend this approach to redshift space. We show how to perform the computation and present the analytic result for the first nonlinear term in the correlation function. Finally, we validate our result through comparison with numerical simulations.