Possible significance of a new dimensionless ratio in cosmology

Details Possible significance of a new dimensionless ratio in cosmology Possible significance of a new dimensionless ratio in cosmology

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8710801t&link_type=abstract

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Physics

Cosmology, Dimensionless Numbers, Matter (Physics), Annihilation Reactions, Baryons, Neutrinos, Particle Density (Concentration), Particle Theory, Ratios

Scientific paper

Observations suggest that the mass density of the Universe is dominated, not by ordinary matter, but by exotic particles which are a relic of the Big Bang. In this case, a new dimensionless cosmological ratio arises, the ratio of the mass density in ordinary matter to that in exotic matter, whose value is about 0.1. A priori it might seem remarkable that this ratio should be so close to unity. However, we point out that, for many exotic dark matter candidates, the ratio is related to the fundamental scales of particle physics. A value of order unity arises naturally providing rather simple relationships exist between these scales.

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