Dark matter and Ricci-like holographic dark energy coupled through a quadratic interaction

Mostrar todas las versiones(3)

We examine a spatially flat Friedmann-Robertson-Walker (FRW) universe filled with interacting dark matter and a modified holographic Ricci dark energy (MHRDE). The interaction term is selected as a significant rational function of the total energy density and its first derivative homogeneous of degr...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Chimento, L.P., Richarte, M.G.
Formato: Documento de conferencia publishedVersion
Publicado: 2012
Materias:
dark energy
dark matter
early dark energy
interaction
relaxed Chaplygin gas
Ricci cutoff
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0094243X_v1471_n_p45_Chimento
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_0094243X_v1471_n_p45_Chimento_oai
Aporte de:
Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires
id I28-R145-paper_0094243X_v1471_n_p45_Chimento_oai
record_format dspace
spelling I28-R145-paper_0094243X_v1471_n_p45_Chimento_oai2024-08-16 Chimento, L.P. Richarte, M.G. 2012 We examine a spatially flat Friedmann-Robertson-Walker (FRW) universe filled with interacting dark matter and a modified holographic Ricci dark energy (MHRDE). The interaction term is selected as a significant rational function of the total energy density and its first derivative homogeneous of degree. We show that the effective one-fluid obeys the equation of state of a relaxed Chaplygin gas, then the universe turns to be dominated by pressureless dark matter at early times and undergoes an accelerated expansion in the far future driven by a strong negative pressure. Performing a X2-statistical analysis with the observational Hubble data and the Union2 compilation of SNe Ia, we place some constraints on cosmological parameters analyzing the feasibleness of the modified holographic Ricci ansatz. It turned that MHRDE gets the accelerated expansion faster than the ΛCDM model. Finally, a new model with a component that does not exchange energy with the interacting dark sector is presented for studying bounds on the dark energy at early times. © 2012 American Institute of Physics. Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Richarte, M.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_0094243X_v1471_n_p45_Chimento info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar AIP Conf. Proc. 2012;1471:45-50 dark energy dark matter early dark energy interaction relaxed Chaplygin gas Ricci cutoff Dark matter and Ricci-like holographic dark energy coupled through a quadratic interaction info:eu-repo/semantics/conferenceObject info:ar-repo/semantics/documento de conferencia info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_0094243X_v1471_n_p45_Chimento_oai
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-145
collection Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic dark energy
dark matter
early dark energy
interaction
relaxed Chaplygin gas
Ricci cutoff
spellingShingle dark energy
dark matter
early dark energy
interaction
relaxed Chaplygin gas
Ricci cutoff
Chimento, L.P.
Richarte, M.G.
Dark matter and Ricci-like holographic dark energy coupled through a quadratic interaction
topic_facet dark energy
dark matter
early dark energy
interaction
relaxed Chaplygin gas
Ricci cutoff
description We examine a spatially flat Friedmann-Robertson-Walker (FRW) universe filled with interacting dark matter and a modified holographic Ricci dark energy (MHRDE). The interaction term is selected as a significant rational function of the total energy density and its first derivative homogeneous of degree. We show that the effective one-fluid obeys the equation of state of a relaxed Chaplygin gas, then the universe turns to be dominated by pressureless dark matter at early times and undergoes an accelerated expansion in the far future driven by a strong negative pressure. Performing a X2-statistical analysis with the observational Hubble data and the Union2 compilation of SNe Ia, we place some constraints on cosmological parameters analyzing the feasibleness of the modified holographic Ricci ansatz. It turned that MHRDE gets the accelerated expansion faster than the ΛCDM model. Finally, a new model with a component that does not exchange energy with the interacting dark sector is presented for studying bounds on the dark energy at early times. © 2012 American Institute of Physics.
format Documento de conferencia
Documento de conferencia
publishedVersion
author Chimento, L.P.
Richarte, M.G.
author_facet Chimento, L.P.
Richarte, M.G.
author_sort Chimento, L.P.
title Dark matter and Ricci-like holographic dark energy coupled through a quadratic interaction
title_short Dark matter and Ricci-like holographic dark energy coupled through a quadratic interaction
title_full Dark matter and Ricci-like holographic dark energy coupled through a quadratic interaction
title_fullStr Dark matter and Ricci-like holographic dark energy coupled through a quadratic interaction
title_full_unstemmed Dark matter and Ricci-like holographic dark energy coupled through a quadratic interaction
title_sort dark matter and ricci-like holographic dark energy coupled through a quadratic interaction
publishDate 2012
url http://hdl.handle.net/20.500.12110/paper_0094243X_v1471_n_p45_Chimento
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_0094243X_v1471_n_p45_Chimento_oai
work_keys_str_mv AT chimentolp darkmatterandriccilikeholographicdarkenergycoupledthroughaquadraticinteraction
AT richartemg darkmatterandriccilikeholographicdarkenergycoupledthroughaquadraticinteraction
_version_ 1809356988964929536

Ejemplares similares