Weak and strong field approximations and circular orbits of the Kehagias-Sfetsos space-time

M. Dwornik, Z. S. Horváth, L. Gergely

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The Kehagias-Sfetsos asymptotically flat black hole and naked singularity solutions of the Hořava-Lifshitz gravity are investigated both in the weak-field and strong-field regimes. In the weak-field limit the gravitational field generated by the Kehagias-Sfetsos spherically symmetric solution is weaker then in the case of the Schwarzschild black hole of general relativity. In the strong-field regime naked singularities with ω0 ≪ 1 display an unusual distance dependence: gravity becomes weaker when approaching the singularity. The stability of circular orbits is also analyzed. While in the black hole case the square of the angular momentum should be larger than a certain finite, non-zero minimal value, in the naked singularity case there are stable circular orbits for any non-zero value of the angular momentum. In this regime we prove the existence of an infimum of the allowed radii of circular orbits (corresponding to vanishing angular momentum).

Original languageEnglish
Pages (from-to)1039-1042
Number of pages4
JournalAstronomische Nachrichten
Volume334
Issue number9
DOIs
Publication statusPublished - Nov 2013

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naked singularities
circular orbits
angular momentum
orbits
approximation
gravity
gravitation
gravitational fields
relativity
radii

Keywords

  • Accretion, accretion disks
  • Black hole physics
  • Gravitation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Weak and strong field approximations and circular orbits of the Kehagias-Sfetsos space-time. / Dwornik, M.; Horváth, Z. S.; Gergely, L.

In: Astronomische Nachrichten, Vol. 334, No. 9, 11.2013, p. 1039-1042.

Research output: Contribution to journalArticle

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