Exactly solved models of interacting dark matter and dark energy

We introduce an effective one-uid description of the interacting dark sector in a spatially at Friedmann-Robertson-Walker space-time and investigate the stability of the power-law solutions. We find the "source equation" for the total energy density and determine the energy density of each...

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Detalles Bibliográficos
Autor principal:	Chimento, Luis Pascual
Publicado:	2012
Materias:	Chaplygin Cosmology Dark energy Dark matter Interaction
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0094243X_v1471_n_p30_Chimento http://hdl.handle.net/20.500.12110/paper_0094243X_v1471_n_p30_Chimento
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_0094243X_v1471_n_p30_Chimento
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spelling	paper:paper_0094243X_v1471_n_p30_Chimento2023-06-08T15:09:12Z Exactly solved models of interacting dark matter and dark energy Chimento, Luis Pascual Chaplygin Cosmology Dark energy Dark matter Interaction We introduce an effective one-uid description of the interacting dark sector in a spatially at Friedmann-Robertson-Walker space-time and investigate the stability of the power-law solutions. We find the "source equation" for the total energy density and determine the energy density of each dark component. We study linear and nonlinear interactions which depend on the dark matter and dark energy densities, their first derivatives, the total energy density with its derivatives up to second order and the scale factor. We solve the evolution equations of the dark components for both interactions, examine exhaustively several examples and show cases where the problem of the coincidence is alleviated. We show that a generic nonlinear interaction gives rise to the "relaxed Chaplygin gas model" whose effective equation of state includes the variable modified Chaplygin gas model while some others nonlinear interactions yield de Sitter and power-law scenarios. © 2012 American Institute of Physics. Fil:Chimento, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0094243X_v1471_n_p30_Chimento http://hdl.handle.net/20.500.12110/paper_0094243X_v1471_n_p30_Chimento
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Chaplygin Cosmology Dark energy Dark matter Interaction
spellingShingle	Chaplygin Cosmology Dark energy Dark matter Interaction Chimento, Luis Pascual Exactly solved models of interacting dark matter and dark energy
topic_facet	Chaplygin Cosmology Dark energy Dark matter Interaction
description	We introduce an effective one-uid description of the interacting dark sector in a spatially at Friedmann-Robertson-Walker space-time and investigate the stability of the power-law solutions. We find the "source equation" for the total energy density and determine the energy density of each dark component. We study linear and nonlinear interactions which depend on the dark matter and dark energy densities, their first derivatives, the total energy density with its derivatives up to second order and the scale factor. We solve the evolution equations of the dark components for both interactions, examine exhaustively several examples and show cases where the problem of the coincidence is alleviated. We show that a generic nonlinear interaction gives rise to the "relaxed Chaplygin gas model" whose effective equation of state includes the variable modified Chaplygin gas model while some others nonlinear interactions yield de Sitter and power-law scenarios. © 2012 American Institute of Physics.
author	Chimento, Luis Pascual
author_facet	Chimento, Luis Pascual
author_sort	Chimento, Luis Pascual
title	Exactly solved models of interacting dark matter and dark energy
title_short	Exactly solved models of interacting dark matter and dark energy
title_full	Exactly solved models of interacting dark matter and dark energy
title_fullStr	Exactly solved models of interacting dark matter and dark energy
title_full_unstemmed	Exactly solved models of interacting dark matter and dark energy
title_sort	exactly solved models of interacting dark matter and dark energy
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0094243X_v1471_n_p30_Chimento http://hdl.handle.net/20.500.12110/paper_0094243X_v1471_n_p30_Chimento
work_keys_str_mv	AT chimentoluispascual exactlysolvedmodelsofinteractingdarkmatteranddarkenergy
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Exactly solved models of interacting dark matter and dark energy

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