Cosmological Tests of the Disformal Coupling to Radiation

Abstract

Light scalar fields can naturally couple disformally to Standard Model fields without giving rise to the unacceptably large fifth forces usually associated with light scalars. We show that these scalar fields can still be studied and constrained through their interaction with photons, and focus particularly on changes to the Cosmic Microwave Background spectral distortions and violations of the distance duality relation. We then specialise our constraints to scalars which could play the role of axionic quintessence.

References in corpus (3)

• Dynamics of dark energy
• Screening Modifications of Gravity through Disformally Coupled Fields
• Non-minimally coupled dark matter: effective pressure and structure formation

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