Black Holes in Extended Gravity Theories in Palatini Formalism

Martinez-Asencio, J.; Olmo, Gonzalo J.; Rubiera-García, Diego

doi:10.1007/978-3-642-40157-2_48

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…A difficulty that may arise in our case in comparison with GR is that the peculiarities of our theory prevent the use of delta functions to describe the matter profile. In addition, the consideration of two (ingoing and outgoing) fluxes implies that the curvature scalar Q becomes a function of the product ρ in ρ out [25].…”

Section: Discussionmentioning

confidence: 99%

Black hole formation from a null fluid in extended Palatini gravity

2012

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We study the formation and perturbation of black holes by null fluxes of neutral matter in a quadratic extension of General Relativity formulated a la Palatini. Working in a spherically symmetric space-time, we obtain an exact analytical solution for the metric that extends the usual Vaidya-type solution to this type of theories. We find that the resulting space-time is formally that of a Reissner-Nordstrom black hole but with an effective charge term carrying the wrong sign in front of it. This effective charge is directly related to the luminosity function of the radiation stream. When the ingoing flux vanishes, the charge term disappears and the space-time relaxes to that of a Schwarzschild black hole. We provide two examples that illustrate the formation of a black hole from Minkowski space and the perturbation by a finite pulse of radiation of an existing Schwarzschild black hole.Comment: 8 pages, double column (revtex4-1), 4 figure

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Section: Discussionmentioning

confidence: 99%

Black hole formation from a null fluid in extended Palatini gravity

2012

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“…For Lagrangians linear in curvature (that is, the Einstein-Hilbert one) this viewpoint uncovers nothing new [3]. Lagrangians quadratic (or higher) in curvature, are however essentially different in that FO and SO formalisms are not equivalent [28]. When the background metric is Ricci flat, for example, Minkowski or Schwarzschild spacetimes, the metric field obeys an algebraic (essentially trivial) EoM so that all the dynamics in encoded in the connection field.…”

Section: Generalities Of the First Order Approachmentioning

confidence: 99%