166 research outputs found
Uninformed Hawking Radiation
We show in detail that the Parikh-Wilczek tunneling method (PWTM), which was
designed for resolving the information loss problem in Hawking radiation
(HR)fails whenever the radiation occurs from an isothermal process. The PWTM
aims to produce a non-thermal HR which adumbrates the resolution of the problem
of unitarity in quantum mechanics (QM), and consequently the entropy (or
information) conservation problem. The effectiveness of the method has been
satisfactorily tested on numerous black holes (BHs). However, it has been shown
that the isothermal HR, which results from the emission of the uncharged
particles of the linear dilaton BH (LDBH) described in the
Einstein-Maxwell-Dilaton (EMD) theory, the PWTM has vulnerability in having
non-thermal radiation. In particular, we consider Painlev\'e-Gullstrand
coordinates (PGCs) and isotropic coordinates (ICs) in order to prove the
aformentioned failure in the PWTM. While carrying out calculations in the ICs,
we also highlight the effect of the refractive index on the null geodesics.Comment: 4 pages, minor corrections, corrected typo
On a Particular Thin-shell Wormhole
In this paper, using a black hole with scalar hair, we construct a scalar
thin-shell wormhole (TSW) in 2+1 dimensions by applying the Visser's famous cut
and paste technique. The surface stress, which is concentrated at the wormhole
throat is determined by using the Darmois-Israel formalism. By employing the
various gas models, we study the stability analysis of the TSW. The region of
stability is changed by tuning the parameters of "l" and "u". It is observed
that the obtained particular TSW originated from the black hole with scalar
hair could be more stable with particular parameter, however it still needs
exotic matter.Comment: 9 pages, accepted for publication in TMPh (Theoretical and
Mathematical Physics
- …