Disformal couplings and the dark sector of the universe

Abstract

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.

28 + 1 pages, 15 figures. JCAP style. V3: Reference added; final version sent to journal

References in corpus (17)

• Dynamics of dark energy
• Cosmology and the Fate of Dilatation Symmetry
• Dynamics of dark energy with a coupling to dark matter
• Indications of a late-time interaction in the dark sector
• Dynamics of interacting dark energy
• Screening Modifications of Gravity through Disformally Coupled Fields
• Coupled and Extended Quintessence: theoretical differences and structure formation
• Resilience of the standard predictions for primordial tensor modes
• Coupled dark matter-dark energy in light of near Universe observations
• Disformal Theories of Gravity: From the Solar System to Cosmology
• Constraining Disformally Coupled Scalar Fields
• Disformal transformation of cosmological perturbations
• New interactions in the dark sector mediated by dark energy
• Towards Viable Cosmological Models of Disformal Theories of Gravity
• Assisted coupled quintessence
• A new quasidilaton theory of massive gravity
• Disformal quintessence

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