Nonstationary dark energy around a black hole

Ratindranath Akhoury, David Garfinkle, Ryo Saotome, and Alexander Vikman
Phys. Rev. D 83, 084034 – Published 19 April 2011

Abstract

Numerical simulations of the accretion of test scalar fields with nonstandard kinetic terms (of the k-essence type) onto a Schwarzschild black hole are performed. We find a full dynamical solution for the spherical accretion of a Dirac-Born-Infeld type scalar field. The simulations show that the accretion eventually settles down to a well-known stationary solution. This particular analytical steady state solution maintains two separate horizons. The standard horizon is for the usual particles propagating with the limiting speed of light, while the other sonic horizon is for the k-essence perturbations propagating with the speed of sound around this accreting background. For the case where the k-essence perturbations propagate superluminally, we show that one can send signals from within a black hole during the approach to the stationary solution. We also find that a ghost condensate model settles down to a stationary solution during the accretion process.

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  • Received 11 March 2011

DOI:https://doi.org/10.1103/PhysRevD.83.084034

© 2011 American Physical Society

Authors & Affiliations

Ratindranath Akhoury1,*, David Garfinkle2,1,†, Ryo Saotome1,‡, and Alexander Vikman3,§

  • 1Michigan Center for Theoretical Physics, Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120, USA
  • 2Department of Physics, Oakland University, Rochester, Michigan 48309, USA
  • 3Theory Division, CERN, Geneva 23, CH-1211, Switzerland

  • *akhoury@umich.edu
  • garfinkl@oakland.edu
  • rsaotome@umich.edu
  • §alexander.vikman@cern.ch

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Issue

Vol. 83, Iss. 8 — 15 April 2011

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