Talk detail

Participant	Olmo, Gonzalo J.
Institution	University of Valencia - CSIC - C/Dr. Moliner, 50 - Burjassot - Valencia - Spain

Session	AT3	Accepted	Yes	Order	5	Time	17:15	30'
Talk	Oral abstract	Title	Ricci-Based Gravity Theories and their Correspondence with GR.
Coauthors	Afonso, V. I. ; Orazi, E. ; Rubiera-Garcia, D.
Abstract	I will show that the field equations of metric-affine theories of gravity whose Lagrangian is a nonlinear function of the Ricci tensor can be written in Einstein form introducing both an auxiliary metric and auxiliary matter fields. In this way the resolution of the equations can be done directly from within the framework of General Relativity coupled to nonlinear matter fields. In other words, the nonlinearities of the gravity sector can be transferred to the matter fields. The correspondence with the original nonlinear gravity theory only involves algebraic manipulations. Standard analytical and numerical methods can thus be used to deal with these theories.
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Session	AT1	Accepted	Yes	Order	2	Time	15:15	20'
Talk	Oral abstract	Title	Metric-affine (non-singular) black holes sourced by anisotropic fluids in quadratic f(R) gravity
Coauthors	Bejarano, C.; Rubiera-Garcia, D.
Abstract	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.
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