Radiative Decay of a Long-Lived Massive Particle and Big-Bang Nucleosynthesis

Astronomy and Astrophysics – Astrophysics

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Scientific paper

The effects of radiatively decaying, long-lived particles on big-bang nucleosynthesis (BBN) are discussed. If high energy photons are emitted after BBN, they may change the abundances of the light elements through photodissociation processes, which may result in a significant discrepancy between the BBN theory and observation. We calculate the abundances of the light elements, including the effects of photodissociation induced by a radiatively decaying particle, and we derive a constraint on such particles by comparing our theoretical results with observations. Taking into account the recent controversies regarding the observations of the primordial D and ^4 He abundances, we derive constraints for various combinations of the measurements. We also discuss several models which predict such radiatively decaying particles (SUSY particles etc.), and we derive constraints on such models.

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