2024-03-28T22:30:35Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/330782017-01-24T13:06:53Zcom_10261_61com_10261_4col_10261_314
Dark coupling and gauge invariance
Gavela, Mª Belén
López Honórez, Laura
Mena, Olga
Rigolin, Stefano
We study a coupled dark energy–dark matter model in which the energymomentum
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.
B. G. and L. L. H are supported by CICYT through the project FPA2009-09017
and by CAM through the project HEPHACOS, P-ESP-00346. L. L. H. ackowledges
the partial support of the F.N.R.S. and the I.I.S.N.. O. M. work is supported by
the MICINN Ramón y Cajal contract, AYA2008-03531 and CSD2007-00060. S. R.
acknowledges the partial support of an Excellence Grant of Fondazione Cariparo and
of the European Program “Unification in the LHC era” under the contract PITNGA-
2009-237920 (UNILHC). All the authors acknowledge partial support by the
PAU (Physics of the accelerating universe) Consolider Ingenio 2010.
Peer reviewed
2011-03-04T13:26:46Z
2011-03-04T13:26:46Z
2010-11
artículo
http://purl.org/coar/resource_type/c_6501
Journal of Cosmology and Astroparticle Physics (JCAP) 11: 044 (2010)
1475-7516
http://hdl.handle.net/10261/33078
10.1088/1475-7516/2010/11/044
en
http://dx.doi.org/10.1088/1475-7516/2010/11/044
open
Institute of Physics Publishing