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Type: Artigo de periódico
Title: Circular Geodesics Of Naked Singularities In The Kehagias-sfetsos Metric Of Hořava's Gravity
Author: Vieira R.S.S.
Schee J.
Kluzniak W.
Stuchlik Z.
Abramowicz M.
Abstract: We discuss photon and test-particle orbits in the Kehagias-Sfetsos (KS) metric of Hořava's gravity. For any value of the Hořava parameter ω, 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-Nordström naked singularities. When event horizons are present, the orbits outside the Kehagias-Sfetsos black hole are qualitatively similar to those of the Schwarzschild metric. © 2014 American Physical Society.
Editor: American Physical Society
Citation: Physical Review D - Particles, Fields, Gravitation And Cosmology. American Physical Society, v. 90, n. 2, p. - , 2014.
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.90.024035
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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