Nonlinear effects of dark energy clustering beyond the acoustic scales

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 bey...

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Detalles Bibliográficos
Publicado: 2014
Materias:
cosmological perturbation theory
dark energy theory
power spectrum
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v2014_n7_p_Anselmi
http://hdl.handle.net/20.500.12110/paper_14757516_v2014_n7_p_Anselmi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_14757516_v2014_n7_p_Anselmi
record_format dspace
spelling paper:paper_14757516_v2014_n7_p_Anselmi2023-06-08T16:17:55Z Nonlinear effects of dark energy clustering beyond the acoustic scales cosmological perturbation theory dark energy theory power spectrum 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. © 2014 IOP Publishing Ltd and Sissa Medialab srl. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v2014_n7_p_Anselmi http://hdl.handle.net/20.500.12110/paper_14757516_v2014_n7_p_Anselmi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic cosmological perturbation theory
dark energy theory
power spectrum
spellingShingle cosmological perturbation theory
dark energy theory
power spectrum
Nonlinear effects of dark energy clustering beyond the acoustic scales
topic_facet cosmological perturbation theory
dark energy theory
power spectrum
description 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. © 2014 IOP Publishing Ltd and Sissa Medialab srl.
title Nonlinear effects of dark energy clustering beyond the acoustic scales
title_short Nonlinear effects of dark energy clustering beyond the acoustic scales
title_full Nonlinear effects of dark energy clustering beyond the acoustic scales
title_fullStr Nonlinear effects of dark energy clustering beyond the acoustic scales
title_full_unstemmed Nonlinear effects of dark energy clustering beyond the acoustic scales
title_sort nonlinear effects of dark energy clustering beyond the acoustic scales
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v2014_n7_p_Anselmi
http://hdl.handle.net/20.500.12110/paper_14757516_v2014_n7_p_Anselmi
_version_ 1768545112243044352

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