Physics
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phrvd..53.4232s&link_type=abstract
Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 53, Issue 8, 15 April 1996, pp.4232-4236
Physics
17
Particle-Theory And Field-Theory Models Of The Early Universe, Finite-Temperature Field Theory, Elementary Particle Processes
Scientific paper
We present a general prescription for the effects of medium-dependent wave function renormalization on rates of reactions involving a Dirac particle. The result is applied to the corrections of order e2 to the weak interaction rates prior to nucleosynthesis, due to the thermal photon and e+e- baths. The results coming from the standard ``finite temperature'' corrections in the literature, a decrease of the predicted He abundance by 0.16%, are found to be replaced by an increase of 0.02%. But there are indications that plasma corrections that are not included at the e2 level may be more important than these corrections.
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