Light-element yields with cosmological decaying gravitinos

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmology, Decay, Gravitinos, Light Elements, Antimatter, Baryons, Maxima, Nuclear Reactions, Particle Density (Concentration), Photons

Scientific paper

Light-element yields, when a population of decaying gravitinos is present, have been evaluated for an interval of gravitino masses (mG) from 10 to 100,000 GeV, when only the photon-photino decay mode is allowed, and when both this channel and the gluon-gluino channel are open. Nuclei photodisintegration by photons and nuclei destruction by antimatter from gravitino decay have been taken into account. Upper bounds on the gravitino number density have been calculated by demanding that light-element production in the framework agree with observations. These limits strongly depend on the allowed decay modes and on the baryon density. If gluon-gluino is open, a region in the mG-YG plane has been found where light elements are synthetized in coherence with measured abundances for a critical baryon density corresponding to the Hubble constant of 50 km/s mpc.

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