1205.2937 (Samina S. Masood)

QED Near the Decoupling Temperature    [PDF]

Samina S. Masood

We study the effective parameters of QED near the decoupling temperature and show that the QED perturbation theory works perfectly fine at temperatures, below the decoupling temperature. The only significant contribution appear to be the selfmass correction around these temperatures. Thermal contributions to other renormalization constants are ignorable. Temperature dependent selfmass of electron, at T=m, gives two different values, if approached differently to the same overlapping point. The difference in low and high temperature values measures the fermion background contribution as compared to the boson background. It is shown that at T=m, change in thermal contribution of the electron selfmass is 1/3 of the low temperature value and 1/2 of the high temperature value. The difference of behavior measures the electron background contributions at T=m. These electrons are emitted through beta decay. This rise in mass affects the other renormalization constants of QED and change the electromagnetic properties of the medium with temperature also. However, these contributions are ignorable near decoupling temperature.

View original: http://arxiv.org/abs/1205.2937