Entropy per baryon in a 'many-worlds' cosmology

Details Entropy per baryon in a 'many-worlds' cosmology Entropy per baryon in a 'many-worlds' cosmology

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..47..423c&link_type=abstract

Astrophysics and Space Science, vol. 47, Apr. 1977, p. 423-433. Research supported by the National Research Council of Canada.

Astronomy and Astrophysics

Astronomy

1

Baryons, Cosmology, Entropy, Exobiology, Abiogenesis, Black Holes (Astronomy), Galactic Clusters, Galactic Evolution

Scientific paper

A concept is explored whereby the universe is imagined as branching into infinitely many worlds, only one of which we experience, that can have any possible value of entropy per baryon (xi). Noting that xi of the order of 1 billion in our world, it is suggested that life can evolve only in worlds with xi in the range from 300,000 to 500 billion. The effect of entropy on galaxy formation is investigated on the basis of the theory that initially statistical density fluctuations grew adiabatically and condensed out into superclusters of galaxies. The results are used to suggest that: (1) density fluctuations collapse into giant black holes without forming galaxies in high-entropy worlds; (2) only metal-poor dwarf galaxies without planets form in low-entropy worlds; (3) life may be possible but scarce in worlds with xi lying near the limits of the cited range; and (4) life will be abundant only in worlds with a much narrower range of xi. Two questions are posed: what is the optimum value of xi for the greatest abundance of life and how close to that optimum is the entropy of our world.

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