In this paper we have studied the propagation of a massless scalar field minimally coupled
to a black hole with the source of cloud of strings in 2+ 1 f (R) gravity theory. In particular we …

In a seminal paper, Alcubierre showed that Einstein's theory of general relativity appears to
allow a super-luminal motion. In the present study, we use a recent eternal-warp-drive …

A derivation of entropy from the expressions for two dimensional gravitation anomalies is
given. Starting from the near horizon anomalous energy–momentum tensors corresponding …

In this paper, we start from the Lagrangian analysis on the action to naturally produce the
geodesic equation of the massive particle via tunneling. Then, basing on the new definition …

Abstract Since Parikh and Wilczek proposed a semiclassical tunneling method to investigate
the Hawking radiation of static and spherically symmetric black holes, the method has been …

In the work [JY Zhang and Z. Zhao, Massive particles's black hole tunneling and de Sitter
tunneling, Nucl. Phys. B 725 (2005) 173.], the Hawking radiation of the massive particle via …

We compute the full asymptotic symmetry group of black holes belonging to the same
equivalence class of solutions within the conformal Weyl gravity formalism. We do this within …

In this paper, by applying the Lagrangian analysis on the action, we first redefine the
geodesic equation of the charged massive particle. Then, basing on the new definition of the …

The d-dimensional scalar field action may be reduced, in the background geometry of a
black hole, to a two-dimensional effective action. In the near-horizon region, it appears a …

We study the thermodynamics of near horizon near extremal Kerr (NHNEK) geometry within
the framework of AdS 2/CFT 1 correspondence. We start by shifting the horizon of near …