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Abstract:

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.

Registro:

Documento: Artículo
Título:Nonlinear effects of dark energy clustering beyond the acoustic scales
Autor:Anselmi, S.; Nacir, D.L.; Sefusatti, E.
Filiación:Department of Physics/CERCA/ISO, Case Western Reserve University, Cleveland, OH 44106-7079, United States
Abdus Salam International Center for Theoretical Physics, Strada costiera 11, I-34151 Trieste, Italy
Departamento de Física and IFIBA, FCEyN UBA, Ciudad Universitaria, Pabellón I, 1428 Buenos Aires, Argentina
INAF - Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (LC), Italy
Palabras clave:cosmological perturbation theory; dark energy theory; power spectrum
Año:2014
Volumen:2014
Número:7
DOI: http://dx.doi.org/10.1088/1475-7516/2014/07/013
Título revista:Journal of Cosmology and Astroparticle Physics
Título revista abreviado:J. Cosmol. Astroparticle Phys.
ISSN:14757516
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v2014_n7_p_Anselmi

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Citas:

---------- APA ----------
Anselmi, S., Nacir, D.L. & Sefusatti, E. (2014) . Nonlinear effects of dark energy clustering beyond the acoustic scales. Journal of Cosmology and Astroparticle Physics, 2014(7).
http://dx.doi.org/10.1088/1475-7516/2014/07/013
---------- CHICAGO ----------
Anselmi, S., Nacir, D.L., Sefusatti, E. "Nonlinear effects of dark energy clustering beyond the acoustic scales" . Journal of Cosmology and Astroparticle Physics 2014, no. 7 (2014).
http://dx.doi.org/10.1088/1475-7516/2014/07/013
---------- MLA ----------
Anselmi, S., Nacir, D.L., Sefusatti, E. "Nonlinear effects of dark energy clustering beyond the acoustic scales" . Journal of Cosmology and Astroparticle Physics, vol. 2014, no. 7, 2014.
http://dx.doi.org/10.1088/1475-7516/2014/07/013
---------- VANCOUVER ----------
Anselmi, S., Nacir, D.L., Sefusatti, E. Nonlinear effects of dark energy clustering beyond the acoustic scales. J. Cosmol. Astroparticle Phys. 2014;2014(7).
http://dx.doi.org/10.1088/1475-7516/2014/07/013