Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991acaps..11..213x&link_type=abstract
Acta Astrophys. Sin., Vol. 11, No. 3, p. 213 - 219
Astronomy and Astrophysics
Astrophysics
Black Holes: Cosmology, Black Holes: Entropy
Scientific paper
Making use of the comoving-frame, the authors discuss the energy-momentum tensor, the 4D-entropy current vector and the total entropy change of an imperfect fluid collapsing system, in which its own gravitational field plays a role, before the system's horizon appears. As a result, the total entropy of the collapsing system is unchanged or reduced, before the horizon appears. But according to original reference frames, the black hole entropy is higher by a factor of about 1020 than that of the corresponding collapsing matter. Therefore, when a black hole forms, the entropy value takes a sudden change, instead of increasing gradually to the order of magnitude of the black hole entropy in the course of collapsing.
Li Yuanjie
Xiao Jiguang
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