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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Vieira, Ronaldo S. S. [1, 2, 3] ; Schee, Jan [3] ; Kluzniak, Wlodek [2, 3] ; Stuchlik, Zdenek [3] ; Abramowicz, Marek [2, 3, 4]
Total Authors: 5
Affiliation:
[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas - Brazil
[2] Copernicus Astron Ctr, PL-00716 Warsaw - Poland
[3] Silesian Univ, Inst Phys, Fac Philosophy & Sci, CZ-74601 Opava - Czech Republic
[4] Gothenburg Univ, Dept Phys, Gothenburg - Sweden
Total Affiliations: 4
Document type: Journal article
Source: Physical Review D; v. 90, n. 2 JUL 14 2014.
Web of Science Citations: 24
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. (AU)

FAPESP's process: 13/01001-0 - A dynamical study of the Eddington capture sphere
Grantee:Ronaldo Savioli Sumé Vieira
Support type: Scholarships abroad - Research Internship - Doctorate