Dark Coupling and Gauge Invariance

We study a coupled dark energy-dark matter model in which the energy-momentum exchange is proportional to the Hubble expansion rate. The inclusion of its perturbation is required by gauge invariance. We derive the linear perturbation equations for the gauge invariant energy density contrast and velo...

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Detalles Bibliográficos
Autores principales: Gavela, M B, Lopez-Honorez, L, Mena, O, Rigolin, S
Formato: info:eu-repo/semantics/article
Lenguaje:eng
Publicado: 2010
Materias:
Astrophysics and Astronomy
Acceso en línea:http://cds.cern.ch/record/1263511
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author Gavela, M B
Lopez-Honorez, L
Mena, O
Rigolin, S
author_facet Gavela, M B
Lopez-Honorez, L
Mena, O
Rigolin, S
author_sort Gavela, M B
collection CERN
description We study a coupled dark energy-dark matter model in which the energy-momentum exchange is proportional to the Hubble expansion rate. The inclusion of its perturbation is required by gauge invariance. We derive the linear perturbation equations for the gauge invariant energy density contrast and velocity of the coupled fluids, and we determine the initial conditions. The latter turn out to be adiabatic for dark energy, when assuming adiabatic initial conditions for all the standard fluids. We perform a full Monte Carlo Markov Chain likelihood analysis of the model, using WMAP 7-year data.
format info:eu-repo/semantics/article
id cern-1263511
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2010
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spelling cern-12635112019-09-30T06:29:59Z http://cds.cern.ch/record/1263511 eng Gavela, M B Lopez-Honorez, L Mena, O Rigolin, S Dark Coupling and Gauge Invariance Astrophysics and Astronomy We study a coupled dark energy-dark matter model in which the energy-momentum exchange is proportional to the Hubble expansion rate. The inclusion of its perturbation is required by gauge invariance. We derive the linear perturbation equations for the gauge invariant energy density contrast and velocity of the coupled fluids, and we determine the initial conditions. The latter turn out to be adiabatic for dark energy, when assuming adiabatic initial conditions for all the standard fluids. We perform a full Monte Carlo Markov Chain likelihood analysis of the model, using WMAP 7-year data. info:eu-repo/grantAgreement/EC/FP7/237920 info:eu-repo/semantics/openAccess Education Level info:eu-repo/semantics/article http://cds.cern.ch/record/1263511 2010-05-04
spellingShingle Astrophysics and Astronomy
Gavela, M B
Lopez-Honorez, L
Mena, O
Rigolin, S
Dark Coupling and Gauge Invariance
title Dark Coupling and Gauge Invariance
title_full Dark Coupling and Gauge Invariance
title_fullStr Dark Coupling and Gauge Invariance
title_full_unstemmed Dark Coupling and Gauge Invariance
title_short Dark Coupling and Gauge Invariance
title_sort dark coupling and gauge invariance
topic Astrophysics and Astronomy
url http://cds.cern.ch/record/1263511
http://cds.cern.ch/record/1263511
work_keys_str_mv AT gavelamb darkcouplingandgaugeinvariance
AT lopezhonorezl darkcouplingandgaugeinvariance
AT menao darkcouplingandgaugeinvariance
AT rigolins darkcouplingandgaugeinvariance

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