Resummation and cancellation of the VIA source in electroweak baryogenesis

Autor:	Postma, Marieke, van de Vis, Jorinde, White, Graham
Rok vydání:	2022
Předmět:	High Energy Physics - Phenomenology Astrophysics - Cosmology and Nongalactic Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.1007/JHEP12(2022)121
Popis:	We re-derive the vev-insertion approximation (VIA) source in electroweak baryogenesis. In contrast to the original derivation, we rely solely on 1-particle-irreducible self-energy diagrams. We solve the Green's function equations both perturbatively and resummed over all vev-insertions. The VIA source corresponds to the leading order contribution in the gradient expansion of the Kadanoff-Baym (KB) equations. We find that it vanishes both for bosons and fermions, both in the perturbative and in the resummed approach. Interestingly, the non-existence of the source is a result of a cancellation between different terms in the KB equations, and not of a pathology in the vev-insertion approximation itself. Comment: 29 Pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2206.01120 Zobrazit plný text záznamu View this record from Arxiv