Baryon-to-entropy ratio and initial conditions of the Universe

Details Baryon-to-entropy ratio and initial conditions of the Universe Baryon-to-entropy ratio and initial conditions of the Universe

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981phrvd..24.1049p&link_type=abstract

Physical Review D (Particles and Fields), Volume 24, Issue 4, 15 August 1981, pp.1049-1052

Physics

2

Scientific paper

We show that if the heavy bosons which enter into the grand-unified-theory mechanism for generating nonzero baryon number are created at an earlier stage by the expansion of the Universe and decay sufficiently early (kT>~3×1015 GeV), then the baryon-to-entropy ratio will depend on the degree of anisotropy of the initial expansion. In the case of initially isotropic expansion, the baryon-to-entropy ratio will be roughly 30 times larger than in the standard scenario in which the particles are present initially in a thermal bath.

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