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

@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 = {http://dx.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://dx.doi.org/10.1103/PhysRevD.90.024035.