A comparison of the entropies of collapsing stars and black holes

Details A comparison of the entropies of collapsing stars and black holes A comparison of the entropies of collapsing stars and black holes

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982cha%26a...6..157g&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 6, Issue 2, p. 157-163.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We considered three modes of black hole formation: (I) a black hole kernel first forms at the centre of a collapsing star and as the outer matter falls, the kernel grows until the whole star becomes a black hole; (II) all the layers of a collapsing simultaneously satisfy the Schwarzschild condition; (III) the outermost layer first satisfies the Schwarzschild condition. For each mode, we calculated the entropy carried by the collapsing matter, Sm, and the entropy of the black hole so formed, SBH. We found SBH to be 1019 times Sm and the lower limit of the mass capable of becoming a black hole to be the Planck mass, Mp = 10-5g. A discussion on the nature of SBH led us to think that SBH possibly contains things other than the ordinary thermodynamical entropy.

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