Primordial Nucleosynthesis and Finite Temperature QED
Mahnaz Q. Haseeb, Obaidullah Jan, Omair Sarfaraz
TL;DR
This paper calculates two-loop finite temperature QED corrections to primordial nucleosynthesis parameters, refining predictions of light element abundances during the early universe with high-precision data.
Contribution
It provides the first detailed evaluation of higher-order QED corrections at finite temperature affecting primordial nucleosynthesis.
Findings
Quantified two-loop QED effects on neutron decay rate
Estimated impact on total energy density of the universe
Analyzed changes in neutrino temperature during nucleosynthesis
Abstract
Abundances of light nuclei formed during primordial nucleosynthesis are predicted by Standard Big Bang Model. The latest data from WMAP, with precision's higher than ever before, provides a motivation to determine theoretical higher order corrections to change in helium abundance and the related parameters. Here we evaluate the QED corrections to the change in these parameters during primordial nucleosynthesis using finite temperature effects at the two loop level. Relative variations in neutron decay rate, total energy density of the universe, relative change in neutrino temperature etc., with two loop corrections to electron mass, at the timescale when QED corrections were relevant, have been estimated.
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