2014/02/18 by Stefano Anselmi, Diana López Nacir, Emiliano Sefusatti · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Galaxies: Formation, Evolution, Phenomena #Nonlinear system #Quintessence #Range (aeronautics) #Resummation #Scalar (mathematics) #Simple (philosophy) #Spectral density #astro-ph.CO
paper · pdf · doi:10.1088/1475-7516/2014/07/013
28 pages, 12 figures
arxiv created 2014/02/18 · openalex publication_date 2014/07/08 · arxiv updated 2015/06/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We extend the resummation method of Anselmi & Pietroni (2012) to compute the total density power spectrum in models of quintessence characterized by a vanishing speed of sound. For standard ΛCDM cosmologies, this resummation scheme allows predictions with an accuracy at the few percent level beyond the range of scales where acoustic oscillations are present, therefore comparable to other, common numerical tools. In addition, our theoretical approach indicates an approximate but valuable and simple relation between the power spectra for standard quintessence models and models where scalar field perturbations appear at all scales. This, in turn, provides an educated guess for the prediction of nonlinear growth in models with generic speed of sound, particularly valuable since no numerical results are yet available.