Geons in Palatini gravity: charge without charge and mass without mass.

Gonzalo Olmo,

University of Valencia & IFIC-CSIC (Valencia, Spain).

Relaxing the Riemannian condition on the affine connection (Palatini approach) offers new avenues to explore extensions of general relativity (GR) at high energies. Following this basic idea, I study the structure of electrically charged black holes in quadratic Palatini gravity.  I will show that all the solutions of this theory can be seen as geons (gravitational-electromagnetic entities) consisting on a wormhole supported by the electromagnetic field. These objects have associated a charge and a mass despite being solutions of source-free equations. We will also see that in the lowest part of the charge and mass spectrum of these solutions, the event horizon may disappear yielding a family of non-singular and topologically stable objects. Such configurations can be naturally seen as black hole remnants and could play a relevant role in dark matter scenarios.