Abstract
Nucleosynthesis bounds on Jordan-Brans-Dicke theories of gravity are updated using improved determinations of 4He, D + 3He and 7Li primordial abundances and neutron life-time. We find, for N v = 3 and most of the allowed Ω 0h 0 2 range, stronger bounds than those obtained from post-newtonian experiments, ∥ω∥ > 250 (2σ). In particular at 2σ level, ω > 380 (440) for Ω 0h 0 2 = 0.25 (1). Furthermore, it is suggested that GR predictions with N v = 3 are hardly consistent with nucleosynthesis observations at 90% CL, while GR with N v = 2 seems to accommodate better the observations.
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