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

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

Conferencia; Grav17; 2017

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 quadraticf(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 work throws further evidence on the fact that the metric-affine formulation in theories beyondGeneral Relativity represents an encouraging approach to tackle the shortcomings posed by classical singularities.