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Circular geodesics of naked singularities in the Kehagias-Sfetsos metric of Horava's gravity

Journal article
Authors R. S. S. Vieira
J. Schee
W. Kluzniak
Z. Stuchlik
Marek A Abramowicz
Published in Physical Review D
Volume 90
Issue 2
Pages Article Number: 024035
ISSN 1550-7998
Publication year 2014
Published at Department of Physics (GU)
Pages Article Number: 024035
Language en
Links dx.doi.org/10.1103/PhysRevD.90.0240...
Keywords LIFSHITZ GRAVITY, BLACK-HOLES, SPACE-TIME, CONSTRAINTS, ORBITS, MOTION, DISKS, FIELD, Astronomy & Astrophysics, Physics, Particles & Fields, UCHLIK Z, 1980, BULLETIN OF THE ASTRONOMICAL INSTITUTES OF CZECHOSLOVAKIA, V31, P129
Subject categories Astronomy, Astrophysics and Cosmology

Abstract

We discuss photon and test-particle orbits in the Kehagias-Sfetsos (KS) metric of Horava's gravity. For any value of the Horava parameter., there are values of the gravitational mass M for which the metric describes a naked singularity, and this is always accompanied by a vacuum "antigravity sphere" on whose surface a test particle can remain at rest (in a zero angular momentum geodesic), and inside which no circular geodesics exist. The observational appearance of an accreting KS naked singularity in a binary system would be that of a quasistatic spherical fluid shell surrounded by an accretion disk, whose properties depend on the value of M, but are always very different from accretion disks familiar from the Kerr-metric solutions. The properties of the corresponding circular orbits are qualitatively similar to those of the Reissner-Nordstrom naked singularities. When event horizons are present, the orbits outside the Kehagias-Sfetsos black hole are qualitatively similar to those of the Schwarzschild metric.

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