A1 Journal article (refereed)
CP-violating transport theory for electroweak baryogenesis with thermal corrections (2021)
Kainulainen, K. (2021). CP-violating transport theory for electroweak baryogenesis with thermal corrections. Journal of Cosmology and Astroparticle Physics, 2021(11), Article 042. https://doi.org/10.1088/1475-7516/2021/11/042
JYU authors or editors
Publication details
All authors or editors: Kainulainen, Kimmo
Journal or series: Journal of Cosmology and Astroparticle Physics
eISSN: 1475-7516
Publication year: 2021
Publication date: 01/11/2021
Volume: 2021
Issue number: 11
Article number: 042
Publisher: IOP Publishing
Publication country: United Kingdom
Publication language: English
DOI: https://doi.org/10.1088/1475-7516/2021/11/042
Publication open access: Not open
Publication channel open access: Channel is not openly available
Web address of parallel published publication (pre-print): https://arxiv.org/abs/2108.08336
Abstract
We derive CP-violating transport equations for fermions for electroweak baryogenesis from the CTP-formalism including thermal corrections at the one-loop level. We consider both the VEV-insertion approximation (VIA) and the semiclassical (SC) formalism. We show that the VIA-method is based on an assumption that leads to an ill-defined source term containing a pinch singularity, whose regularisation by thermal effects leads to ambiguities including spurious ultraviolet and infrared divergences. We then carefully review the derivation of the semiclassical formalism and extend it to include thermal corrections. We present the semiclassical Boltzmann equations for thermal WKB-quasiparticles with source terms up to the second order in gradients that contain both dispersive and finite width corrections. We also show that the SC-method reproduces the current divergence equations and that a correct implementation of the Fick's law captures the semiclassical source term even with conserved total current ∂μjμ = 0. Our results show that the VIA-source term is not just ambiguous, but that it does not exist. Finally, we show that the collisional source terms reported earlier in the semiclassical literature are also spurious, and vanish in a consistent calculation.
Keywords: cosmology; particle physics
Free keywords: cosmology; astroparticle physics
Contributing organizations
Ministry reporting: Yes
Reporting Year: 2021
JUFO rating: 1