Exactly solved models of interacting dark matter and dark energy

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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, L.P.
Formato: CONF
Materias:
Chaplygin
Cosmology
Dark energy
Dark matter
Interaction
Acceso en línea: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 todo:paper_0094243X_v1471_n_p30_Chimento
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spelling todo:paper_0094243X_v1471_n_p30_Chimento2023-10-03T14:56:04Z Exactly solved models of interacting dark matter and dark energy Chimento, L.P. 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. CONF info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, L.P.
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.
format CONF
author Chimento, L.P.
author_facet Chimento, L.P.
author_sort Chimento, L.P.
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
url http://hdl.handle.net/20.500.12110/paper_0094243X_v1471_n_p30_Chimento
work_keys_str_mv AT chimentolp exactlysolvedmodelsofinteractingdarkmatteranddarkenergy
_version_ 1807323528037400576

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