Thursday, July 5, 2012

1207.1086 (Daniel C. Guariento et al.)

Realistic fluids as source for dynamically accreting black holes in a
cosmological background
   [PDF]

Daniel C. Guariento, Michele Fontanini, A. M. da Silva, Elcio Abdalla
We show that a single imperfect fluid can be used as a source to obtain the generalized McVittie metric as an exact solution to Einstein's equations. The mass parameter in this metric varies with time thanks to a mechanism based on the presence of a temperature gradient. This fully dynamical solution is interpreted as an accreting black hole in an expanding universe if the metric asymptotes to Schwarzschild-de Sitter at temporal infinity. We present a simple but instructive example for the mass function and briefly discuss the structure of the apparent horizons and the past singularity.
View original: http://arxiv.org/abs/1207.1086

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