Primordial black holes and the deuterium problem

Details Primordial black holes and the deuterium problem Primordial black holes and the deuterium problem

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sval....3..110z&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 3, May 1977, p. 208-211.) Soviet Astronomy Letters, vol. 3, May-June 1977, p. 110-112.

Astronomy and Astrophysics

Astronomy

29

Big Bang Cosmology, Black Holes (Astronomy), Deuterium, Particle Emission, Antinucleons, Astronomical Models, Baryons, Helium Isotopes, Nuclear Fusion, Nucleons, Particle Density (Concentration)

Scientific paper

The effect of high-energy baryons and antibaryons emitted during evaporation of primordial black holes (PBHs) with masses of 1 billion to 1 trillion g on cosmological nucleosynthesis is investigated. Rigorous bounds on the PBH spectrum are obtained for the mass range considered, and a possible solution to the problem of the origin of cosmogenic deuterium is examined. Calculations are performed which indicate that antinucleons from PBHs with masses of about 1 billion g would be annihilated in reactions with background nucleons some time later than 1 sec after the big bang. The neutron density might then increase relative to the proton density, leading to an increase in the He-4 fraction in primordial matter. Finally, the neutrons released during the splitting of the He-4 nuclei by ultrarelativistic nucleons and antinucleons from PBHs with masses of more than 10 billion g evaporating at times in excess of 1000 sec after the big bang would be captured by protons, thus producing the required amount of deuterium.

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