Zobrazeno 1 - 10
of 598
pro vyhledávání: '"Hajian K"'
Publikováno v:
Phys.Rev.D 106 (2022) 10, 104030
In gauge invariant theories, like Einstein-Maxwell theory, physical observables should be gauge invariant. In particular, mass, entropy, angular momentum, electric charge and their respective chemical potentials, temperature, horizon angular velocity
Externí odkaz:
http://arxiv.org/abs/2209.00563
Publikováno v:
Phys. Lett. B812 (2020) 136002
It has been observed that for black holes in certain family of Horndeski gravity theories Wald's entropy formula does not lead to the correct first law for black hole thermodynamics. For this family of Horndeski theories speeds of propagation of grav
Externí odkaz:
http://arxiv.org/abs/2005.12985
Publikováno v:
Phys. Rev. D 98, 026025 (2018)
We present a one-function family of solutions to 4D vacuum Einstein equations. While all diffeomorphic to the same extremal Kerr black hole, they are labeled by well-defined conserved charges and are hence distinct geometries. We show that this famil
Externí odkaz:
http://arxiv.org/abs/1708.06378
Autor:
Hajian, K., Sheikh-Jabbari, M. M.
Publikováno v:
Phys.Lett. B768 (2017) 228-234
Black holes as solutions to gravity theories, are generically identified by a set of parameters. Some of these parameters are associated with black hole physical conserved charges, like ADM charges. There can also be some "redundant parameters." We p
Externí odkaz:
http://arxiv.org/abs/1612.09279
Publikováno v:
Eur. Phys. J. C (2016) 76: 701
Restricting the covariant gravitational phase spaces to the manifold of parametrized families of solutions, the mass, angular momenta, entropies, and electric charges can be calculated by a single and simple method. In this method, which has been cal
Externí odkaz:
http://arxiv.org/abs/1606.04353
Autor:
Alizadeh Garna S; Student Research Committee, Babol University of Medical Sciences, Babol, Iran., Yazdani S; Infertility and Reproductive Health Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran., Musavi H; Student Research Committee, Babol University of Medical Sciences, Babol, Iran., Ranaei M; Clinical Research Development Unite of Rouhani Hospital, Babol University of Medical Sciences, Babol, Iran., Hajian K; Social Determinants of Health Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran., Bouzari Z; Infertility and Reproductive Health Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran.
Publikováno v:
Caspian journal of internal medicine [Caspian J Intern Med] 2024 Winter; Vol. 15 (1), pp. 87-95.
Autor:
Hajian, K., Sheikh-Jabbari, M. M.
Publikováno v:
Phys. Rev. D 93, 044074 (2016)
We provide a general formulation for calculating conserved charges for solutions to generally covariant gravitational theories with possibly other internal gauge symmetries, in any dimensions and with generic asymptotic behaviors. These solutions are
Externí odkaz:
http://arxiv.org/abs/1512.05584
Publikováno v:
JHEP 1510 (2015) 093
We construct the classical phase space of geometries in the near-horizon region of vacuum extremal black holes as announced in [arXiv:1503.07861]. Motivated by the uniqueness theorems for such solutions and for perturbations around them, we build a f
Externí odkaz:
http://arxiv.org/abs/1506.07181
Publikováno v:
Phys.Lett. B749 (2015) 443-447
We construct the NHEG phase space, the classical phase space of Near-Horizon Extremal Geometries with fixed angular momenta and entropy, and with the largest symmetry algebra. We focus on vacuum solutions to $d$ dimensional Einstein gravity. Each ele
Externí odkaz:
http://arxiv.org/abs/1503.07861
Publikováno v:
JHEP 1410 (2014) 111
In arXiv:1310.3727 we formulated and derived the three universal laws governing Near Horizon Extremal Geometries (NHEG). In this work we focus on the Entropy Perturbation Law (EPL) which, similarly to the first law of black hole thermodynamics, relat
Externí odkaz:
http://arxiv.org/abs/1407.1992