125 research outputs found
The higher dimensional Myers-Perry black hole with single rotation always obeys the Cosmic Censorship Conjecture
Even though the Myers-Perry five dimensional rotating black hole with two
rotations could be overspun by test particle accretion, yet it turns out as we
show in this letter that it cannot do so for a single rotation. On the other
hand it is known that there exists no extremal limit for a black hole with
single rotation in dimensions greater than equal to six. It has been proven
that all higher dimensional () rotating black holes with only one single
rotation can never be overspun under test particle linear accretion and hence
would always obey CCC in the weak form.Comment: 5 pages, no figures; Coincides with published versio
Horizon structure of rotating Einstein-Born-Infeld black holes and shadow
We investigate the horizon structure of the rotating Einstein-Born-Infeld
solution which goes over to the Einstein-Maxwell's Kerr-Newman solution as the
Born-Infeld parameter goes to infinity (). We find
that for a given , mass and charge , there exist critical
spinning parameter and , which corresponds to an extremal
Einstein-Born-Infeld black hole with degenerate horizons, and decreases
and increases with increase in the Born-Infeld parameter .
While describe a non-extremal Einstein-Born-Infeld black hole with
outer and inner horizons. Similarly, the effect of on infinite redshift
surface and in turn on ergoregion is also included. It is well known that a
black hole can cast a shadow as an optical appearance due to its strong
gravitational field. We also investigate the shadow cast by the non-rotating
() Einstein-Born-Infeld black hole and demonstrate that the null geodesic
equations can be integrated that allows us to investigate the shadow cast by a
black hole which is found to be a dark zone covered by a circle. Interestingly,
the shadow of the Einstein-Born-Infeld black hole is slightly smaller than for
the Reissner-Nordstrom black hole. F urther, the shadow is concentric circles
whose radius decreases with increase in value of parameter .Comment: 13 pages, 12 figure
Energy Extraction and Particle Acceleration Around Rotating Black Hole in Horava-Lifshitz Gravity
Penrose process on rotational energy extraction of the black hole (BH) in the
original non-projectable Ho\v{r}ava-Lifshitz gravity is studied. The strong
dependence of the extracted energy from the special range of parameters of the
Ho\v{r}ava-Lifshitz gravity, such as parameter and specific angular
momentum has been found. Particle acceleration near the rotating BH in
Ho\v{r}ava-Lifshitz gravity has been studied. It is shown that the fundamental
parameter of the Ho\v{r}ava-Lifshitz gravity can impose limitation on the the
energy of the accelerating particles preventing them from the infinite value.Comment: 6 pages, 3 figures, accepted for publication in Physical Review
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