Event Horizon Telescope observations exclude compact objects in baseline mimetic gravity

Abstract

Mimetic gravity has gained significant appeal in cosmological contexts, but static spherically symmetric space-times within the baseline theory are highly non-trivial: the two natural solutions are a naked singularity and a black hole space-time obtained through an appropriate gluing procedure. We study the shadow properties of these two objects, finding both to be pathological. In particular, the naked singularity does not cast a shadow, whereas the black hole casts a shadow which is too small. We argue that the Event Horizon Telescope images of M87${}^{\star }$ and Sgr A${}^{\star }$ rule out the baseline version of mimetic gravity, preventing the theory from successfully accounting for the dark sector on cosmological scales. Our results highlight an interesting complementarity between black hole imaging observations and modified gravity theories of cosmological interest.

13 pages, 8 sub-figures arranged into 4 figures, key summary figure of our results (diagrammatic synopsis) is Fig. 4. v2: added new references, added new figure showing examples of null geodesics, fixed a few minor typos. Version accepted for publication in Scientific Reports

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