Palatini f(R) and Extended Palatini f(R,Q) Black Holes with Electric charge

por Diego Rubiera-García (Universidad de Oviedo)

jueves 27 oct. 2011 10:30 → 11:30 Europe/Madrid

Sala Seminarios (Dpto. de Física Teórica (UVEG))

We study electrically charged black holes in f(R) and f(R,Q) theories formulated à la Palatini, i.e. by assuming the metric and connection to be independent entities. We show that in the f(R) case, electromagnetic theories with vanishing trace (as Maxwell theory) itself produces the same equations of motion as those of General Relativity (GR), which motivates us to consider non-linear extensions (non-linear electrodynamics). We show how the structure of GR-Born-Infeld black holes is modified near the center in terms of internal horizons and how the central singularities could be ameliorated. In the f(R,Q) we show that Maxwell theory already produces different results from those of GR, and we find different kinds of structures including regular black holes (singularity-free) and regular cores.