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Primordial Nucleosynthesis was 'cold' ?

Widdekind
in Modern and Theoretical Physics

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According to this site, given the observed abundances of Deuterium, 3-Helium, & Lithium, Primeval Nucleosynthesis could have occurred, at almost any temperature, T < 500 MK, with next-to-no discriminative sensitivity beyond that. What is the cosmic abundance of neutrons (which would discriminate) ??

 

primordialnucleosynthes.jpg

According to this site, given the observed abundances of Deuterium, 3-Helium, & Lithium, Primeval Nucleosynthesis could have occurred, at almost any temperature, T < 500 MK, with next-to-no discriminative sensitivity beyond that. What is the cosmic abundance of neutrons (which would discriminate) ??

 

primordialnucleosynthes.jpg

The nucleosynthesis occurred for T > 500 MK (NOT <). The cosmic abundance of FREE neutrons is 0.

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