A survey of entropy in the universe

Details A survey of entropy in the universe A survey of entropy in the universe

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990qjras..31..359b&link_type=abstract

Royal Astronomical Society, Quarterly Journal (ISSN 0035-8738), vol. 31, Sept. 1990, p. 359-369.

Astronomy and Astrophysics

Astronomy

6

Big Bang Cosmology, Entropy, Universe, Black Body Radiation, Milky Way Galaxy, Neutrinos, Neutron Stars, Relic Radiation

Scientific paper

Matter emerged from the big bang with a large and uniform entropy per baryon. The entropy distribution today is surveyed, and a large spread is found, but all recognized objects have significantly smaller entropy per baryon than they had at the big bang. This is presumably compensated by high entropy per baryon in intergalactic regions of low baryon density. Most entropy lies in the cosmic microwave background and the corresponding neutrino background. Bekenstein-Hawking entropies per gram for black holes are very large, in stark contrast to the lowest specific entropies of all found in neutron stars.

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