Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-04-27
Phys.Rev. D74 (2006) 103509
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages (revtex), 11 figures, title changed, matches published version
Scientific paper
10.1103/PhysRevD.74.103509
Big Bang nucleosynthesis in the presence of decaying relic neutral particles is examined in detail. All non-thermal processes important for the determination of light-element abundance yields of 2H, 3H, 3He, 4He, 6Li, and 7Li are coupled to the thermonuclear fusion reactions to obtain comparatively accurate results. Predicted light-element yields are compared to observationally inferred limits on primordial light-element abundances to infer constraints on the abundances and properties of relic decaying particles with decay times in the interval 0.01 sec < tau < 10^(12) sec. Decaying particles are typically constrained at early times by 4He or 2H, at intermediate times by 6Li, and at large times by the 3He/2H ratio. Constraints are shown for a large number of hadronic branching ratios and decaying particle masses and may be applied to constrain the evolution of the early Universe.
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