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2016

Non-Gaussianity in multi-sound-speed disformally coupled inflation

van de Bruck, Carsten, Koivisto, Tomi, Longden, Chris

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Most, if not all, scalar-tensor theories are equivalent to General Relativity with a disformally coupled matter sector.

In extra-dimensional theories such a coupling can be understood as a result of induction of the metric on a brane that matter is confined to.
This article presents a first look at the non-Gaussianities in disformally coupled inflation, a simple two-field model that features a novel kinetic interaction.
Cases with both canonical and Dirac-Born-Infeld (DBI) kinetic terms are taken into account, the latter motivated by the possible extra-dimensional origin of the disformality.

Non-Gaussianity in multi-sound-speed disformally coupled inflation · Around

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