Astronomy and Astrophysics – Astronomy
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.279..303t&link_type=abstract
Nature, vol. 279, May 24, 1979, p. 303-305.
Astronomy and Astrophysics
Astronomy
20
Baryons, Black Holes (Astronomy), Universe, Galactic Evolution, Particle Interactions, Spatial Distribution
Scientific paper
The paper discusses some recent ideas in particle physics which may explain how an initially baryon-symmetrical universe could have evolved into one with net baryon number. Weinberg's (1979) scheme for production of a baryon/photon ratio of approximately 10 to the -10th to 10 to the -8th is discussed, according to which, if the lifetime of the X-boson is approximately that of the universe, the universe acquires a baryon/photon ratio in proportion to the size of the CP violation. One might also be able to account for a net baryon number by assuming a nonuniform spatial distribution of primordial black holes. If the entropy added by the evaporation of black holes is small, the density fluctuations caused by the spatial distribution of black holes will be nearly isothermal. The primordial black holes act as seeds, evaporating after baryon nonconserving collisions become ineffective and thereby generating a baryon excess that is not neutralized.
Schramm David N.
Turner Michael S.
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