Circular geodesics of naked singularities in the
Kehagias-Sfetsos metric of Hořava?s gravity

J 2014

Circular geodesics of naked singularities in the Kehagias-Sfetsos metric of Hořava?s gravity

ABRAMOWICZ, Marek; Włodek KLUŹNIAK; Jan SCHEE; Zdeněk STUCHLÍK; Ronaldo Savioli Sumé VIEIRA et al.

Basic information

Original name

Circular geodesics of naked singularities in the Kehagias-Sfetsos metric of Hořava?s gravity

Authors

ABRAMOWICZ, Marek; Włodek KLUŹNIAK; Jan SCHEE; Zdeněk STUCHLÍK and Ronaldo Savioli Sumé VIEIRA

Edition

Physical Review D, US - Spojené státy americké, 2014, 1550-7998

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

10308 Astronomy

Confidentiality degree

is not subject to a state or trade secret

References:

URL

Impact factor

Impact factor: 4.643

Marked to be transferred to RIV

Organization unit

Faculty of Philosophy and Science in Opava

Keywords in English

Hořava's gravity

Links

EE2.3.20.0071, research and development project. GB14-37086G, research and development project.

Changed: 15/4/2021 11:00, Mgr. Pavlína Jalůvková

Abstract

In the original language

We discuss photon and test-particle orbits in the Kehagias-Sfetsos (KS) metric of Hořava?s gravity. For any value of the Hořava parameter omega, there are values of the gravitational mass M for which the metric describes a naked singularity, and this isalways 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 tho

Cite

ABRAMOWICZ, Marek; Włodek KLUŹNIAK; Jan SCHEE; Zdeněk STUCHLÍK and Ronaldo Savioli Sumé VIEIRA. Circular geodesics of naked singularities in the Kehagias-Sfetsos metric of Hořava?s gravity. Physical Review D. US - Spojené státy americké, 2014, vol. 90, No 2, p. "024035-1"-"024035-14", 14 pp. ISSN 1550-7998. Available from: https://doi.org/10.1103/PhysRevD.90.024035.

@article{43082,
   author = {Abramowicz, Marek and Kluźniak, Włodek and Schee, Jan and Stuchlík, Zdeněk and Vieira, Ronaldo Savioli Sumé},
   article_location = {US - Spojené státy americké},
   article_number = {2},
   doi = {https://doi.org/10.1103/PhysRevD.90.024035},
   keywords = {Hořava's gravity},
   language = {eng},
   issn = {1550-7998},
   journal = {Physical Review D},
   title = {Circular geodesics of naked singularities in the Kehagias-Sfetsos metric of Hořava?s gravity},
   url = {http://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.024035},
   volume = {90},
   year = {2014}
}

TY  - JOUR
ID  - 43082
AU  - Abramowicz, Marek - Kluźniak, Włodek - Schee, Jan - Stuchlík, Zdeněk - Vieira, Ronaldo Savioli Sumé
PY  - 2014
TI  - Circular geodesics of naked singularities in the Kehagias-Sfetsos metric of Hořava?s gravity
JF  - Physical Review D
VL  - 90
IS  - 2
SP  - "024035-1"-"024035-14"
EP  - "024035-1"-"024035-14"
SN  - 15507998
KW  - Hořava's gravity
UR  - http://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.024035
N2  - We discuss photon and test-particle orbits in the Kehagias-Sfetsos (KS) metric of Hořava?s gravity. For any value of the Hořava parameter omega, there are values of the gravitational mass M for which the metric describes a naked singularity, and this isalways 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 tho
ER  -

ABRAMOWICZ, Marek; Włodek KLU$\backslash$'ZNIAK; Jan SCHEE; Zdeněk STUCHLÍK and Ronaldo Savioli Sumé VIEIRA. Circular geodesics of naked singularities in the Kehagias-Sfetsos metric of Hořava?s gravity. \textit{Physical Review D}. US - Spojené státy americké, 2014, vol.~90, No~2, p.~''024035-1''-''024035-14'', 14 pp. ISSN~1550-7998. Available from: https://doi.org/10.1103/PhysRevD.90.024035.

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