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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Observational constraints on an interacting dark energy model
Monthly Notices of the Royal Astronomical Society, Volume 402, No. 4, Year 2010
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Description
We use observations of cosmic microwave background (CMB) anisotropies, supernova luminosities and the baryon acoustic oscillation signal in the galaxy distribution to constrain the cosmological parameters in a simple interacting dark energy model with a time-varying equation of state. Using a Monte Carlo Markov Chain technique, we determine the posterior likelihoods. Constraints from the individual data sets are weak, but the combination of the three data sets confines the interaction constant Γ to be less than 23 per cent of the expansion rate of the Universe H0; at 95 per cent confidence level -0.23 < Γ/H0 < +0.15. The CMB acoustic peaks can be well fitted even if the interaction rate is much larger, but this requires a larger or smaller (depending on the sign of interaction) matter density today than in the non-interacting model. Due to this degeneracy between the matter density and the interaction rate, the only observable effect on the CMB is a larger or smaller integrated Sachs-Wolfe effect. While supernova or baryon acoustic oscillation data alone do not set any direct constraints on the interaction, they exclude the models with very large matter density, and hence indirectly constrain the interaction rate when jointly analysed with the CMB data. To enable the analysis described in this paper, we present, in a companion paper, a new systematic analysis of the early radiation era solution to find the adiabatic initial conditions for the Boltzmann integration. © 2010 The Authors. Journal compilation © 2010 RAS.
Authors & Co-Authors
Väliviita, Jussi
United Kingdom, Portsmouth
University of Portsmouth
Maartens, Roy
United Kingdom, Portsmouth
University of Portsmouth
Majerotto, Elisabetta
United Kingdom, Portsmouth
University of Portsmouth
Italy, Merate
Osservatorio Astronomico Di Brera
Statistics
Citations: 136
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.1111/j.1365-2966.2009.16115.x
ISSN:
00358711
Research Areas
Cancer
Study Approach
Systematic review