Disforming to Conformal Symmetry

Abstract

We analyse the dynamical properties of disformally transformed theories of gravity. We show that disformal transformation typically introduces novel degrees of freedom, equivalent to the mimetic dark matter, which possesses a Weyl-invariant formulation. We demonstrate that this phenomenon occurs in a wider variety of disformal transformations than previously thought.

arXiv comment18 pages + bibliography, no figures; V3: minor changes, updated bibliography, published version

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• Generalized disformal Horndeski theories: cosmological perturbations and consistent matter coupling
• More on the fact that Rastall = GR
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• On the degrees of freedom count on singular phase space submanifolds
• Unveiling the inconsistency of the Proca theory with non-minimal coupling to gravity
• Jackiw-Teitelboim Gravity Generates Horndeski via Disformal Transformations