arXiv subjects

K. Kokabi

Publications and source records attributed to K. Kokabi.

4 recordsLinked to original sources

arXiv2018

Higher order corrected thermodynamics and statistics of Kerr-Newman-Godel black hole

In this paper, we consider the rotating charged Gödel black hole and study the effect of the higher order corrections of the entropy on the thermodynamics and statistics quantities of the Kerr-Newman-Gödel black hole. The leading order correction is logarithmic while higher-order terms are proportional to the inverse of the area of the black hole. We obtain modified thermodynamics and statistics and find that correction terms are important in the stability of the black hole.

gr-qc↗

arXiv2017

Higher order quantum corrections of rotating BTZ black hole

In this work, we consider rotating BTZ black hole in three dimensions which is dual of one dimensional holographic superconductors. We applied higher order corrections of the entropy, which interpreted as quantum corrections, to the thermodynamics quantities and study modified thermodynamics. We investigate stability of rotating BTZ black hole under effects of higher order quantum corrections, and find that they affect stability of black hole. So, the small black hole has some instabilities and critical points due to the quantum effects. We also study effect of correction terms on the dual picture of rotating BTZ black hole.

gr-qc↗

arXiv2017

Thermodynamics of higher dimensional black holes with higher order thermal fluctuations

In this paper, we consider higher order corrections of the entropy, which coming from thermal fluctuations, and find their effect on the thermodynamics of higher dimensional charged black holes. Leading order thermal fluctuation is logarithmic term in the entropy while higher order correction is proportional to the inverse of original entropy. We calculate some thermodynamics quantities and obtain the effect of logarithmic and higher order corrections of entropy on them. Validity of the first law of thermodynamics investigated and Van der Waals equation of state of dual picture studied. We find that five-dimensional black hole behaves as Van der Waals, but higher dimensional case have not such behavior. We find that thermal fluctuations are important in stability of black hole hence affect unstable/stable black hole phase transition.

gr-qc↗

arXiv2017

Effect of magnetic field on the rotating filamentary molecular clouds

Purpose of this work is study evolution of magnetized rotating filamentary molecular cloud's. We will consider cylindrical symmetric filamentary molecular clouds at the early stage of evolution. For the first time we consider rotation of filamentary molecular in presence of an axial and azimuthal magnetic field without any assumption of density and magnetic functions. We show that in addition to decreasing of radial collapse velocity, the rotational velocity also affected by magnetic field. Existence of rotation yields to fragment of filament. Moreover, we show that the magnetic field have significant effect on the fragmentation of filamentary molecular clouds.

astro-ph.GA↗