Next Article in Journal / Special Issue
The First Detection of Gravitational Waves
Previous Article in Journal
On the Near-Horizon Canonical Quantum Microstates from AdS2/CFT1 and Conformal Weyl Gravity
Previous Article in Special Issue
Observational Consequences of an Interacting Multiverse
Open AccessArticle

Entropy Budget for Hawking Evaporation

1
Institute of Theoretical Physics, Faculty of Mathematics and Physics, Charles University, 18000 Prague, Czech Republic
2
Instituto de Física Fundamental (IFF-CSIC), Serrano 121, 28006 Madrid, Spain
3
School of Mathematics and Statistics, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
*
Author to whom correspondence should be addressed.
Universe 2017, 3(3), 58; https://doi.org/10.3390/universe3030058
Received: 30 January 2017 / Revised: 17 July 2017 / Accepted: 18 July 2017 / Published: 22 July 2017
(This article belongs to the Special Issue Varying Constants and Fundamental Cosmology)
Blackbody radiation, emitted from a furnace and described by a Planck spectrum, contains (on average) an entropy of 3 . 9 ± 2 . 5 bits per photon. Since normal physical burning is a unitary process, this amount of entropy is compensated by the same amount of “hidden information” in correlations between the photons. The importance of this result lies in the posterior extension of this argument to the Hawking radiation from black holes, demonstrating that the assumption of unitarity leads to a perfectly reasonable entropy/information budget for the evaporation process. In order to carry out this calculation, we adopt a variant of the “average subsystem” approach, but consider a tripartite pure system that includes the influence of the rest of the universe, and which allows “young” black holes to still have a non-zero entropy; which we identify with the standard Bekenstein entropy. View Full-Text
Keywords: black holes; unitarity; information; entropy; entanglement; Clausius entropy; Bekenstein entropy; coarse-grained entropy black holes; unitarity; information; entropy; entanglement; Clausius entropy; Bekenstein entropy; coarse-grained entropy
Show Figures

Figure 1

MDPI and ACS Style

Alonso-Serrano, A.; Visser, M. Entropy Budget for Hawking Evaporation. Universe 2017, 3, 58. https://doi.org/10.3390/universe3030058

AMA Style

Alonso-Serrano A, Visser M. Entropy Budget for Hawking Evaporation. Universe. 2017; 3(3):58. https://doi.org/10.3390/universe3030058

Chicago/Turabian Style

Alonso-Serrano, Ana; Visser, Matt. 2017. "Entropy Budget for Hawking Evaporation" Universe 3, no. 3: 58. https://doi.org/10.3390/universe3030058

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop