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A different perspective on the vev insertion approximation for electroweak baryogenesis
- Source :
- Journal of High Energy Physics, Journal of High Energy Physics, Vol 2021, Iss 9, Pp 1-19 (2021)
- Publication Year :
- 2021
- Publisher :
- Springer, 2021.
-
Abstract
- In the vev insertion approximation (VIA) the spacetime dependent part of the mass matrix is treated as a perturbation. We calculate the source terms for baryogenesis expanding both the self-energy and propagator to first order in mass insertions, which gives the same results as the usual approach of calculating the self-energy at second order and using zeroth order propagators. This procedure shows explicitly the equivalence between including the mass in the free or in the interaction Lagrangian. The VIA source then originates from the same term in the kinetic equation as the semi-classical source, but at leading order in the derivative expansion (the expansion in diamond operators). On top, another type of derivative expansion is done, which we estimate to be valid for a bubble width larger than the inverse thermal width. This cuts off the divergence in the VIA source in the limit that the thermal width vanishes.<br />17 pages, 1 figure. Published version
- Subjects :
- Physics
Nuclear and High Energy Physics
Higgs Physics
Thermal quantum field theory
Spacetime
Electroweak interaction
FOS: Physical sciences
Propagator
Inverse
QC770-798
Cosmology of Theories beyond the SM
Mass matrix
Baryogenesis
High Energy Physics - Phenomenology
High Energy Physics - Phenomenology (hep-ph)
Nuclear and particle physics. Atomic energy. Radioactivity
Quantum electrodynamics
Thermal Field Theory
Limit (mathematics)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Journal of High Energy Physics
- Accession number :
- edsair.doi.dedup.....129ed2b874646387036ed28123b8bd4c