Finite-temperature radiative corrections to early universe neutron-proton ratio: Cancellation of infrared and mass singularities

Details Finite-temperature radiative corrections to early universe neutron-proton ratio: Cancellation of infrared and mass singularities Finite-temperature radiative corrections to early universe neutron-proton ratio: Cancellation of infrared and mass singularities

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nuphb.336..157b&link_type=abstract

Nuclear Physics B, Volume 336, Issue 1, p. 157-183.

Physics

Nuclear Physics

20

Scientific paper

Finite-temperature radiative corrections to the weak neutron-proton decay rates are examined in the framework of real-time field theory. It is shown that infrared and collinear (electron mass) singularities cancel at O(α) when the total neutron <--> proton conversion rates are computed. As a consequence, their perturbative expansion is valid at this order and may be used in helium abundance estimates.
Laboratoire propre du Centre National de la Recherche Scientifique.

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