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Disformal couplings and the dark sector of the universe

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arxiv 1501.03073 v3 pith:NZEM7LAV submitted 2015-01-13 gr-qc astro-ph.COhep-phhep-th

Disformal couplings and the dark sector of the universe

classification gr-qc astro-ph.COhep-phhep-th
keywords disformalcouplingsbackgroundconformaldarkevolutionlargeallowing
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 3 Pith papers

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