PT Journal
AU Martinez-Asencio, J
   Olmo, GJ
   Rubiera-Garcia, D
TI Black hole formation from a null fluid in extended Palatini gravity
SO Physical Review D
JI Phys. Rev. D
PY 2012
BP 104010
EP 8pp
VL 86
IS 10
DI 10.1103/PhysRevD.86.104010
LA English
AB 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 theory. 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.
ER