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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
Interacting dark energy: Constraints and degeneracies
Physical Review D - Particles, Fields, Gravitation and Cosmology, Volume 85, No. 4, Article 043007, Year 2012
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Description
In standard cosmologies, dark energy (DE) interacts only gravitationally with dark matter (DM). There could be a nongravitational interaction in the dark sector, leading to changes in the effective DE equation of state, in the redshift dependence of the DM density and in structure formation. We use cosmic microwave background, baryon acoustic oscillation and supernova data to constrain a model where the energy transfer in the dark sector is proportional to the DE density. There are two subclasses, defined by the vanishing of momentum transfer either in the DM or the DE frame. We conduct a Markov-Chain Monte Carlo analysis to obtain best-fit parameters. The background evolution allows large interaction strengths, and the constraints from cosmic microwave background anisotropies are weak. The growth of DM density perturbations is much more sensitive to the interaction, and can deviate strongly from the standard case. However, the deviations are degenerate with galaxy bias and thus more difficult to constrain. Interestingly, the integrated Sachs-Wolfe signature is suppressed since the nonstandard background evolution can compensate for high growth rates. We also discuss the partial degeneracy between interacting DE and modified gravity, and how this can be broken. © 2012 American Physical Society.
Authors & Co-Authors
Clemson, Timothy
United Kingdom, Portsmouth
University of Portsmouth
Koyama, Kazuya
United Kingdom, Portsmouth
University of Portsmouth
Zhao, Gongbo
United Kingdom, Portsmouth
University of Portsmouth
Maartens, Roy
United Kingdom, Portsmouth
University of Portsmouth
South Africa, Bellville
University of the Western Cape
Väliviita, Jussi
Norway, Oslo
Universitetet I Oslo
Statistics
Citations: 120
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1103/PhysRevD.85.043007
ISSN:
15507998
e-ISSN:
15502368