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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_14757516_v2014_n7_p_Anselmi |
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todo:paper_14757516_v2014_n7_p_Anselmi2023-10-03T16:18:47Z Nonlinear effects of dark energy clustering beyond the acoustic scales Anselmi, S. Nacir, D.L. Sefusatti, E. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 |
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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 Anselmi, S. Nacir, D.L. Sefusatti, E. 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. |
| format |
JOUR |
| author |
Anselmi, S. Nacir, D.L. Sefusatti, E. |
| author_facet |
Anselmi, S. Nacir, D.L. Sefusatti, E. |
| author_sort |
Anselmi, S. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_14757516_v2014_n7_p_Anselmi |
| work_keys_str_mv |
AT anselmis nonlineareffectsofdarkenergyclusteringbeyondtheacousticscales AT nacirdl nonlineareffectsofdarkenergyclusteringbeyondtheacousticscales AT sefusattie nonlineareffectsofdarkenergyclusteringbeyondtheacousticscales |
| _version_ |
1807319321488130048 |