Radiative decay of a massive particle and the non-thermal process in primordial nucleosynthesis

Details Radiative decay of a massive particle and the non-thermal process in primordial nucleosynthesis Radiative decay of a massive particle and the non-thermal process in primordial nucleosynthesis

2000-12-21

arxiv.org/abs/hep-ph/0012279v1

Phys.Rev.D63:103502,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, using REVTeX and 3 postscript figures

Scientific paper

10.1103/PhysRevD.63.103502

We consider the effects on big bang nucleosynthesis (BBN) of the radiative decay of a long-lived massive particle. If high-energy photons are emitted after the BBN epoch ($t \sim 1 - 10^3$ sec), they may change the abundances of the light elements through photodissociation processes, which may result in a significant discrepancy between standard BBN and observation. Taking into account recent observational and theoretical developments in this field, we revise our previous study constraining the abundance of the radiatively-decaying particles. In particular, on the theoretical side, it was recently claimed that the non-thermal production of $^6$Li, which is caused by the photodissociation of $\hefour$, most severely constrains the abundance of the radiatively-decaying particle. We will see, however, it is premature to emphasize the importance of the non-thermal production of $^6$Li because (i) the theoretical computation of the $^6$Li abundance has large uncertainty due to the lack of the precise understanding of the $^6$Li production cross section, and (ii) the observational data of $^6$Li abundance has large errors.

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