期刊
ASTROPHYSICAL JOURNAL
卷 710, 期 2, 页码 1825-1834出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/710/2/1825
关键词
black hole physics; cosmology: miscellaneous; diffusion; elementary particles; gravitation; neutrinos
资金
- Anna Fransson
Using recent measurements of the supermassive black hole (SMBH) mass function, we find that SMBHs are the largest contributor to the entropy of the observable universe, contributing at least an order of magnitude more entropy than previously estimated. The total entropy of the observable universe is correspondingly higher, and is S-obs = 3.1(-1.7)(+3.0) x 10(104) k. We calculate the entropy of the current cosmic event horizon to be S-CEH = 2.6 +/- 0.3 x 10(122) k, dwarfing the entropy of its interior, S-CEH (int) = 1.2(-0.7)(+1.1) x 10(103) k. We make the first tentative estimate of the entropy of weakly interacting massive particle dark matter within the observable universe, S-dm = 10(88 +/- 1) k. We highlight several caveats pertaining to these estimates and make recommendations for future work.
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