Cosmology in a non-standard statistical background

Details Cosmology in a non-standard statistical background Cosmology in a non-standard statistical background

1998-07-03

arxiv.org/abs/astro-ph/9807043v1

Physica A259 (1998) 397

Astronomy and Astrophysics

Astrophysics

Two figures. Accepted for publication in Physica A. This overwrites a previous preprint version, new sections added and mistak

Scientific paper

We study the primordial neutron to baryon ratio in a cosmological expanding background within the context of non-extensive statistics, in a fully analytical approach. First order corrections to the weak interaction rates and energy densities in the early universe are obtained and their consequences on the Helium synthesis are analized. We find that, if the nucleosynthesis scenario should be in agreement with observation, this entails a very restrictive bound upon $q$, the non-extensive parameter. We also study some cosmological interesting situations such as the moment of pair annihilation, conserved comoving quantities and derive for the nonextensive statistics, temperature relationships, before and after the removal of pairs.

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