Special Issue "Entropy and Spacetime"


A special issue of Entropy (ISSN 1099-4300).

Deadline for manuscript submissions: closed (31 January 2015)

Special Issue Editor

Guest Editor
Dr. Hiromi Saida
Department of Physics, Daido University, Nagoya 457-8530, Japan
E-Mail: saida@daido-it.ac.jp
Interests: quantum aspect of black hole; Quantum statistics of gravity; black hole thermodynamics; relativistic dissipative hydrodynamics; theory for direct astronomical observation of black holes

Special Issue Information

Dear Colleagues,

A black hole is an empty region. Anything in a black hole region cannot stay at a constant, proper distance from the center, but has to fall towards the center. In ordinary laboratory physics, we cannot regard an empty region solely as a system that forms some physical state (such as a thermal equilibrium state). Therefore, Hawking’s discovery that thermal radiation is emitted from the surfaces of black hole regions (i.e., black hole horizons) is astonishing. The black hole has to be regarded as a thermal equilibrium system. The fact that Hawking’s radiation is predicted by quantum field theory in the context of black hole spacetime implies that the black hole is a thermal equilibrium state of the underlying quantum gravity.

It is expected that the black hole is regarded as some thermal equilibrium system composed of microscopic constituents of spacetime. Such microscopic constituents should cause the black hole’s entropy. Bekenstein's proposal implies that black hole entropy is given by a quarter of the surface area of the black hole horizon (in Planck units). This is the entropy-area law of black hole. This law should include at least the following two ingredients: (1) the nature of microscopic constituents of spacetime (in other words, microstates of underlying quantum gravity), and (2) the statistical mechanical property of long range interaction systems, since gravity is a long range interaction.

This Special Issue “Entropy and Spacetime” can be a meeting place for statistical mechanics, thermodynamics, black hole, and spacetime physics. Further, both classical and quantum approaches are possible. Contributions from both gravitational and statistical physics are welcome.

Dr. Hiromi Saida
Guest Editor


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. Papers will be published continuously (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as 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 refereed through a peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Entropy 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 1400 CHF (Swiss Francs).


  • black hole thermodynamics
  • black hole entropy
  • entropy-area law
  • quantum gravity approach to black hole entropy
  • statistical mechanics approach to black hole entropy

Published Papers (3 papers)

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Displaying article 1-3
p. 1508-1534
by  and
Entropy 2015, 17(3), 1508-1534; doi:10.3390/e17031508
Received: 1 October 2014 / Revised: 25 February 2015 / Accepted: 27 February 2015 / Published: 23 March 2015
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(This article belongs to the Special Issue Entropy and Spacetime)
p. 6515-6523
by ,  and
Entropy 2014, 16(12), 6515-6523; doi:10.3390/e16126515
Received: 9 October 2014 / Revised: 2 December 2014 / Accepted: 4 December 2014 / Published: 11 December 2014
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(This article belongs to the Special Issue Entropy and Spacetime)
p. 4483-4488
Entropy 2014, 16(8), 4483-4488; doi:10.3390/e16084483
Received: 5 June 2014 / Revised: 4 August 2014 / Accepted: 4 August 2014 / Published: 11 August 2014
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Last update: 28 April 2015

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