Radiating solutions in Entangled Relativity

Abstract

The Mineur--Vaidya radiating solutions satisfy ${\mathcal{L}}_m\propto F^2=0=R$. As a consequence, it is not only a solution in General Relativity, but also in Einstein--Maxwell--dilaton theories for all coupling constants. The specific case of Entangled Relativity is noteworthy because the additional scalar degree of freedom is defined from the ratio between $R$ and ${\mathcal{L}}_m$, which is ill-defined in this situation. In the present work, we embed the Mineur--Vaidya solution in a magnetic (or electric) field within the framework of Entangled Relativity, and show that the Mineur--Vaidya solution corresponds to the limit where the magnetic (respectively, electric) field vanishes. This notably allows us to demonstrate that, as in General Relativity, it is possible to dynamically form naked singularities in Entangled Relativity. This conclusion, in fact, applies to any Einstein--Maxwell--dilaton theory, although it does not seem to be widely acknowledged in the literature.

10 pages

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