Black hole formation from a null fluid in extended Palatini gravity

Abstract

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.

8 pages, double column (revtex4-1), 4 figures

References in corpus (15)

• Extended Theories of Gravity
• Extended Theories of Gravity and their Cosmological and Astrophysical Applications
• Palatini Approach to Modified Gravity: f(R) Theories and Beyond
• Metric-Palatini gravity unifying local constraints and late-time cosmic acceleration
• Bouncing Cosmologies in Palatini $f(R)$ Gravity
• Palatini $f(R)$ Black Holes in Nonlinear Electrodynamics
• Reissner-Nordström black holes in extended Palatini theories
• New Spherically Symmetric Solutions in f(R)-gravity by Noether Symmetries
• Dynamical Aspects of Generalized Palatini Theories of Gravity
• Black hole entropy in modified gravity models
• Noether Charge and Black Hole Entropy in Modified Theories of Gravity
• Nonsingular black holes in quadratic Palatini gravity
• Stability of f(R) black holes
• Nonsingular charged black holes à la Palatini
• Cosmology in Palatini theories of gravity

Cited by in corpus (4)

• Observable traces of non-metricity: new constraints on metric-affine gravity
• Brane-world and loop cosmology from a gravity-matter coupling perspective
• Dynamical generation of wormholes with charged fluids in quadratic Palatini gravity
• Nonsingular black holes in Palatini extensions of General Relativity