Black holes in the ghost condensate

Shinji Mukohyama
Phys. Rev. D 71, 104019 – Published 18 May 2005

Abstract

We investigate how the ghost condensate reacts to black holes immersed in it. A ghost condensate defines a hypersurface-orthogonal congruence of timelike curves, each of which has the tangent vector uμ=gμννϕ. It is argued that the ghost condensate in this picture approximately corresponds to a congruence of geodesics. In other words, the ghost condensate accretes into a black hole just like a pressureless dust. Correspondingly, if the energy density of the ghost condensate at large distance is set to an extremely small value by cosmic expansion then the late-time accretion rate of the ghost condensate should be negligible. The accretion rate remains very small even if effects of higher derivative terms are taken into account, provided that the black hole is sufficiently large. It is also discussed how to reconcile the black-hole accretion with the possibility that the ghost condensate might behave like dark matter.

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  • Received 1 March 2005

DOI:https://doi.org/10.1103/PhysRevD.71.104019

©2005 American Physical Society

Authors & Affiliations

Shinji Mukohyama

  • Department of Physics and Research Center for the Early Universe, The University of Tokyo, Tokyo 113-003, Japan and Jefferson Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, USA

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Issue

Vol. 71, Iss. 10 — 15 May 2005

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