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Sijie Gao has recently investigated Hawking radiation from spherically symmetrical gravitational collapse to an extremal R-N black hole for a real scalar field. Especially he estimated the upper bound for the expected number of particles in…

General Relativity and Quantum Cosmology · Physics 2018-01-17 Hongbao Zhang , Zhoujian Cao , Chongshou Gao

Hawking's groundbreaking prediction that black holes emit thermal radiation and ultimately evaporate remains unverified due to the extreme faintness of this radiation for stellar-mass or larger black holes. In this study, we explore a novel…

High Energy Astrophysical Phenomena · Physics 2025-09-23 Atreya Acharyya , Giacomo Cacciapaglia , Manuel Meyer , Francesco Sannino

It has recently become fashionable to regard black holes as elementary particles. By taking this suggestion seriously it is possible to cobble together an elementary particle physics based estimate for the decay rate $(\hbox{black hole})_i…

High Energy Physics - Theory · Physics 2009-10-22 Matt Visser

The relationship between Hawking radiation emitted by non extremal and extremal Reissner Nordstrom black holes is critically analyzed. A careful study of a series of regular collapsing geometries reveals that the stress energy tensor stays…

High Energy Physics - Theory · Physics 2008-11-26 R. Balbinot , A. Fabbri , S. Farese , R. Parentani

This paper argues that the effect of Hawking radiation on an astrophysical black hole situated in a realistic cosmological context is not total evaporation of the black hole; rather there will always be a remnant mass. The key point is that…

General Relativity and Quantum Cosmology · Physics 2013-10-22 George F R Ellis

We investigate the dynamical formation and evaporation of a spherically symmetric charged black hole. We study the self-consistent one loop order semiclassical back-reaction problem. To this end the mass-evaporation is modeled by an…

General Relativity and Quantum Cosmology · Physics 2014-11-17 Evgeny Sorkin , Tsvi Piran

Hawking radiation of astrophysical black holes is minute and thought to be unobservable. However, different mechanisms could contribute to an anomalously high emission rate: extra dimensions, new "dark" families of bosons or fermions, or a…

General Relativity and Quantum Cosmology · Physics 2021-12-22 Chen Yuan , Richard Brito , Vitor Cardoso

We compute exactly the semi-classical radiation spectrum for a class of non-asymptotically flat charged dilaton black holes, the so-called linear dilaton black holes. In the high frequency regime, the temperature for these black holes…

General Relativity and Quantum Cosmology · Physics 2008-11-26 G. Clement , J. C. Fabris , G. T. Marques

In this letter we study the process of Hawking radiation of a black hole assuming the existence of a limiting physical curvature scale. The particular model is constructed using the Limiting Curvature Hypothesis (LCH) and in the context of…

High Energy Physics - Theory · Physics 2014-11-18 Damien A. Easson

Charged particle emission from black holes with sufficiently large charge is exponentially suppressed. As a result, such black holes are driven towards extremality by the emission of neutral Hawking radiation. Eventually, an isolated black…

High Energy Physics - Theory · Physics 2024-11-07 Adam R. Brown , Luca V. Iliesiu , Geoff Penington , Mykhaylo Usatyuk

Modeling the collapse of an extreme Reissner-Nordstr\"om (ERN) black hole by solving the corresponding moving mirror model for the trajectory that asymptotically approaches uniform acceleration, we obtain the non-zero beta coefficients for…

General Relativity and Quantum Cosmology · Physics 2020-05-28 Michael R. R. Good

We study black hole radiation of a Reissner-Nordstrom black hole with an electric charge in the framework of quantum gravity. Based on a canonical quantization for a spherically symmetric geometry, under physically plausible assumptions, we…

High Energy Physics - Theory · Physics 2015-03-19 Ichiro Oda

We study the sparsity of Hawking radiation from nonrotating singularity-free black holes in conformal gravity. We give a rigorous bound on the greybody factor for massless scalar field and calculate the sparsity of Hawking radiation from…

General Relativity and Quantum Cosmology · Physics 2022-02-22 Jun Zhang , Yuan Sun

A static spherically symmetric black hole usually turns out to be either a Schwarzschild black hole or a Reissner-Nordstr\"{o}m black hole. This result was summarised by Ruffini and Wheeler as the so-called no hair conjecture which states…

General Relativity and Quantum Cosmology · Physics 2019-11-20 Avijit Chowdhury

We study about an approximation method of the Hawking radiation. We analyze an massless scalar field in exotic black hole backgrounds models which have peculiar properties in black hole thermodynamics (monopole black hole in SO(3)…

General Relativity and Quantum Cosmology · Physics 2009-10-31 Takashi Tamaki , Kei-ichi Maeda

Hawking radiation would make microscopic black holes evaporate rapidly, which excludes them from many astrophysical considerations. However, it has been argued that the quantum nature of space would alter this behaviour: the temperature of…

General Relativity and Quantum Cosmology · Physics 2021-11-05 Samuel Kováčik

We study the Hawking radiation in a new class of black hole solutions in the Einstein-Gauss-Bonnet theory. The black hole has been argued to have vanishing mass and entropy, but finite Hawking temperature. To check if it really emits…

General Relativity and Quantum Cosmology · Physics 2015-06-03 Kenji Muneyuki , Nobuyoshi Ohta

We study both spherically symmetric and rotating black holes with dilaton coupling and discuss the evaporation of these black holes via Hawking's quantum radiation and their fates. We find that the dilaton coupling constant $\alpha$…

High Energy Physics - Theory · Physics 2009-10-28 Jun-ichirou Koga , Kei-ichi Maeda

We investigate the possibility of the existence of a classical version of Hawking radiation - solutions to classical field equations that consist solely of outgoing waves, in the spacetime of a collapsing black hole. The non-static nature…

General Relativity and Quantum Cosmology · Physics 2025-06-11 S. A. Paston , D. S. Shatkov

In the companion paper [Phys. Rev. D 103 (2021) 10, [2101.02951]] we have derived the short-ranged potentials for the Teukolsky equations for massless spins $(0,1/2,1,2)$ in general spherically-symmetric and static metrics. Here we apply…

General Relativity and Quantum Cosmology · Physics 2021-10-05 Alexandre Arbey , Jérémy Auffinger , Marc Geiller , Etera R. Livine , Francesco Sartini
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