Disformal couplings and the dark sector of the universe

Interactions between dark matter and dark energy, allowing both conformal and and disformal couplings, are studied in detail. We discuss the background evolution, anisotropies in the cosmic microwave background and large scale structures. One of our main findings is that a large conformal coupling i...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2015-04, Vol.2015 (4), p.36-36
Main Authors: de Bruck, C. van, Morrice, J.
Format: Article
Language:English
Subjects:
ANISOTROPY
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
DISTURBANCES
EVOLUTION
INSTABILITY
NONLUMINOUS MATTER
RELICT RADIATION
SCALAR FIELDS
UNIVERSE
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Summary:Interactions between dark matter and dark energy, allowing both conformal and and disformal couplings, are studied in detail. We discuss the background evolution, anisotropies in the cosmic microwave background and large scale structures. One of our main findings is that a large conformal coupling is not necessarily disallowed in the presence of a general disformal term. On the other hand, we find that negative disformal couplings very often lead to instabilities in the scalar field. Studying the background evolution and linear perturbations only, our results show that it is observationally challenging to disentangle disformal from purely conformal couplings.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2015/04/036