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Symmetry
Special Issues
Black Holes and Quantum Cosmology
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Special Issue "Black Holes and Quantum Cosmology"

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 1235

Special Issue Editor

Dr. Dong-han Yeom

E-Mail Website
Guest Editor
Department of Physics Education, Pusan National University, Geumjeong-gu, Busan, Korea
Interests: cosmology; black hole; instantons; general relativity; quantum gravity; black holes; quantum cosmology

Special Issue Information

Dear Colleagues,

In order to understand the genuine quantum regime of black holes, we need to introduce various non-perturbative techniques. In addition, in order to provide the correct interpretations of non-perturbative effects, we need wisdom from quantum cosmological investigations. Thus, the collaboration between black hole physics and quantum cosmology is a very natural and important theoretical task in modern theoretical physics. In this Special Issue, we invite research papers that cover topics ranging from black hole physics to various approaches towards quantum cosmology.

Dr. Dong-han Yeom
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • black holes
  • quantum cosmology
  • quantum gravity
  • information loss paradox

Published Papers (1 paper)

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Research

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Article
Before the Page Time: Maximum Entanglements or the Return of the Monster?
by
Jeong-Myeong Bae
,
Dong Jin Lee
,
Dong-han Yeom
and
Heeseung Zoe
Symmetry 2022, 14(8), 1649; https://doi.org/10.3390/sym14081649 - 10 Aug 2022
Cited by 2 | Viewed by 771
Abstract
The conservation of information of evaporating black holes is a very natural consequence of unitarity, which is the fundamental symmetry of quantum mechanics. In order to study the conservation of information, we need to understand the nature of the entanglement entropy. The entropy [...] Read more.
The conservation of information of evaporating black holes is a very natural consequence of unitarity, which is the fundamental symmetry of quantum mechanics. In order to study the conservation of information, we need to understand the nature of the entanglement entropy. The entropy of Hawking radiation is approximately equal to the maximum of entanglement entropy if a black hole is in a state before the Page time, i.e., when the entropy of Hawking radiation is smaller than the entropy of the black hole. However, if there exists a process generating smaller entanglements rather than maximal entanglements, the entropy of Hawking radiation will become smaller than the maximum of the entanglement entropy before the Page time. If this process accumulates, even though the probability is small, the emitted radiation can eventually be distinguished from the exactly thermal state. In this paper, we provide several interpretations of this phenomenon: (1) information of the collapsed matter emitted before the Page time, (2) there exists a firewall or a non-local effect before the Page time, or (3) the statistical entropy is greater than the areal entropy; a monster is formed. Our conclusion will help resolve the information loss paradox by providing groundwork for further research. Full article
(This article belongs to the Special Issue Black Holes and Quantum Cosmology)
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