| Texto completo | |
| Autor(es): |
Vieira, Ronaldo S. S.
;
Schee, Jan
;
Kluzniak, Wlodek
;
Stuchlik, Zdenek
;
Abramowicz, Marek
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physical Review D; v. 90, n. 2, p. 14-pg., 2014-07-14. |
| Resumo | |
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) | |
| Processo FAPESP: | 13/01001-0 - Um estudo dinâmico da esfera de captura de Eddington |
| Beneficiário: | Ronaldo Savioli Sumé Vieira |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |