Zobrazeno 1 - 10
of 343
pro vyhledávání: '"Saifullah K"'
Autor:
Ahmed, Jamil, Saifullah, K.
Publikováno v:
Eur. Phys. J. C (2017) 77: 885
The greybody factor of massless, uncharged scalar fields is studied in the background of cylindrically symmetric spacetimes, in the low-energy approximation. We discuss two cases. In the first case we derive analytical expression for the absorption p
Externí odkaz:
http://arxiv.org/abs/1712.07574
Autor:
Ahmed, Jamil, Saifullah, K.
Publikováno v:
European Physical Journal C 78 (2018) 316
In this work we derive a general expression for the greybody factor of non-minimally coupled scalar fields in Reissner-Nordstr\"om-de Sitter spacetime in low frequency approximation. In particular case of zero momentum, greybody factor tends to zero
Externí odkaz:
http://arxiv.org/abs/1610.06104
We consider spin-3/2 particles on the background of general accelerating black holes and C-metric. The Rarita-Schwinger equations of spin-3/2 particles are analyzed on these backgrounds. The emission and absorption probabilities of the spin-3/2 parti
Externí odkaz:
http://arxiv.org/abs/1404.7489
Publikováno v:
Physics Letters B 726 (2013) 827
We study Hawking radiation from three-dimensional black holes. For this purpose the emission of charged scalar and charged fermionic particles is investigated from charged BTZ black holes, with and without rotation. We use the quantum tunneling appro
Externí odkaz:
http://arxiv.org/abs/1306.6380
Autor:
Gohar, H., Saifullah, K.
Publikováno v:
Astroparticle Physics, 48 (2013) 82
Using the Hamilton-Jacobi method of quantum tunneling and complex path integration, we study Hawking radiation of scalar particles from rotating black strings. We discuss tunneling of both charged and uncharged scalar particles from the event horizon
Externí odkaz:
http://arxiv.org/abs/1111.6239
Autor:
Gohar, H., Saifullah, K.
Publikováno v:
Astrophysics and Space Science, 343 (2013) 181
We study quantum tunneling of scalar particles from black strings. For this purpose we apply WKB approximation and Hamilton-Jacobi method to solve the Klein-Gordon equation for outgoing trajectories. We find the tunneling probability of outgoing char
Externí odkaz:
http://arxiv.org/abs/1109.5836
Autor:
Ahmed, Jamil, Saifullah, K.
Publikováno v:
JCAP 11 (2011) 023
Thermal radiations from spherically symmetric black holes have been studied from the point of view of quantum tunneling. In this paper we extend this approach to study radiation of fermions from charged and rotating black strings. Using WKB approxima
Externí odkaz:
http://arxiv.org/abs/1109.1710
Autor:
Ahmed, Jamil, Saifullah, K.
Publikováno v:
JCAP 08 (2011) 011
Hawking radiation has been studied as a phenomenon of quantum tunneling in different black holes. In this paper we extend this semi-classical approach to cylindrically symmetric black holes. Using the Hamilton-Jacobi method and WKB approximation we c
Externí odkaz:
http://arxiv.org/abs/1108.2677
Autor:
Fatima, Aeeman, Saifullah, K.
Publikováno v:
Astrophysics and Space Science, 341 (2012) 437
We study thermodynamics of cylindrically symmetric black holes. Uncharged as well as charged and rotating objects have been discussed. We derive surface gravity and hence the Hawking temperature and entropy for all these cases. We correct some result
Externí odkaz:
http://arxiv.org/abs/1108.1622
Publikováno v:
JCAP 1106:016,2011
Hawking radiation of uncharged and charged scalars from accelerating and rotating black holes is studied. We calculate the tunneling probabilities of these particles from the rotation and acceleration horizons of these black holes. Using the tunnelin
Externí odkaz:
http://arxiv.org/abs/1102.0029