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Title: Nonlinear effects of dark energy clustering beyond the acoustic scales

We extend the resummation method of Anselmi and 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.
Authors:
 [1] ;  [2] ;  [3]
  1. Department of Physics/CERCA/ISO, Case Western Reserve University, Cleveland, OH 44106-7079 (United States)
  2. The Abdus Salam International Center for Theoretical Physics, Strada costiera 11, I-34151 Trieste (Italy)
  3. INAF - Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate (Saint Lucia) (Italy)
Publication Date:
OSTI Identifier:
22373471
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 07; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; APPROXIMATIONS; COSMOLOGY; NONLUMINOUS MATTER; PERTURBATION THEORY; POWER DENSITY; SCALAR FIELDS; SOUND WAVES; SPECTRA