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Cosmological Tests of the Disformal Coupling to Radiation

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arxiv 1306.4168 v1 pith:T55QCJNJ submitted 2013-06-18 astro-ph.CO hep-phhep-th

Cosmological Tests of the Disformal Coupling to Radiation

classification astro-ph.CO hep-phhep-th
keywords fieldslightscalarscalarsassociatedaxionicbackgroundchanges
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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