67 research outputs found
Fermionic quasinormal modes for two-dimensional Ho\v{r}ava-Lifshitz black holes
To obtain fermionic quasinormal modes, the Dirac equation for two types of
black holes is investigated. For the first type of black hole, the quasinormal
modes have continuous spectrum with negative imaginary part that provides the
stability of black hole geometry. For the second type of the black hole, the
quasinormal modes have discrete spectrum and are completely imaginary. This
type of the black hole appears to be stable for arbitrary masses of fermion
field perturbations.Comment: 13 pages, no figure
Charged fermion tunnelling from electrically and magnetically charged rotating black hole in de Sitter space
Thermal radiation of electrically charged fermions from rotating black hole
with electric and magnetic charges in de Sitter space is considered. The
tunnelling probabilities for outgoing and incoming particles are obtained and
the Hawking temperature is calculated. The relation for the classical action
for the particles in the black hole's background is also found.Comment: 7 page
Slowly rotating Einstein-Maxwell-dilaton black hole and some aspects of its thermodynamics
A slowly rotating black hole solution in Einstein-Maxwell-dilaton gravity was
considered. Having used the obtained solution we investigated thermodynamic
functions such as black hole's temperature, entropy and heat capacity. In
addition to examine thermodynamic properties of the black hole extended
technique was applied. The equation of state of Van der Waals type was obtained
and investigated. It has been shown that the given system has phase transitions
of the first as well as of the zeroth order for the temperatures below a
critical one which is notable feature of the black hole. A coexistence relation
for two phases was also considered and latent heat was calculated. In the end,
critical exponents were calculated.Comment: 23 pages, 9 figure
Perturbation hydrogen-atom spectrum in deformed space with minimal length
We study energy spectrum for hydrogen atom with deformed Heisenberg algebra
leading to minimal length. We develop correct perturbation theory free of
divergences. It gives a possibility to calculate analytically in the 3D case
the corrections to -levels of hydrogen atom caused by the minimal length.
Comparing our result with experimental data from precision hydrogen
spectroscopy an upper bound for the minimal length is obtained.Comment: 9 pages, 3 figure
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