Metric-affine (non-singular) black holes sourced by anisotropic fluids in quadratic f(R) gravity

DIEGO RUBIERA-GARCIA; GONZALO J. OLMO; CECILIA BEJARANO

Encuentro; Fifteenth Marcel Grossmann Meeting - MG15; 2018

Working in a metric-affine (Palatini) framework, we obtain and analyze black hole solutions generated by anisotropic fluids with various equations of state. In particular, we study the inner structure of the black holes and the geodesic completeness of these spacetimes in the context of quadratic f(R) gravity. We find that, depending on the matter model parameters, the standard point-like singularity can be replaced by a wormhole, which makes the spacetime non-singular. This throws further evidence on the fact that the metric-affine formulation in theories beyond General Relativity represents an encouraging approach to tackle the shortcomings posed by classical singularities.