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Title:
Primordial black holes and the deuterium problem
Authors:
ZELDOVICH, IA. B.; STAROBINSKII, A. A.; KHLOPOV, M. IU.; CHECHETKIN, V. M.
Affiliation:
AD(Akademiia Nauk SSSR, Institut Prikladnoi Matematiki and Institut Teoreticheskoi Fiziki, Moscow, USSR)
Journal:
Pis'ma v Astronomicheskii Zhurnal, vol. 3, May 1977, p. 208-211. In Russian.
Publication Date:
05/1977
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BIG BANG COSMOLOGY, BLACK HOLES (ASTRONOMY), DEUTERIUM, PARTICLE EMISSION, ANTINUCLEONS, ASTRONOMICAL MODELS, BARYONS, HELIUM ISOTOPES, NUCLEAR FUSION, NUCLEONS, PARTICLE DENSITY (CONCENTRATION)
Bibliographic Code:
1977SvAL....3Q.208Z

Abstract

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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