A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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-tekijät tai -toimittajat
Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: Kainulainen, Kimmo
Lehti tai sarja: Journal of Cosmology and Astroparticle Physics
eISSN: 1475-7516
Julkaisuvuosi: 2021
Ilmestymispäivä: 01.11.2021
Volyymi: 2021
Lehden numero: 11
Artikkelinumero: 042
Kustantaja: IOP Publishing
Julkaisumaa: Britannia
Julkaisun kieli: englanti
DOI: https://doi.org/10.1088/1475-7516/2021/11/042
Julkaisun avoin saatavuus: Ei avoin
Julkaisukanavan avoin saatavuus: Julkaisukanava ei ole avoin
Rinnakkaistallenteen verkko-osoite (pre-print): https://arxiv.org/abs/2108.08336
Tiivistelmä
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.
YSO-asiasanat: kosmologia; hiukkasfysiikka
Vapaat asiasanat: cosmology; astroparticle physics
Liittyvät organisaatiot
OKM-raportointi: Kyllä
Raportointivuosi: 2021
JUFO-taso: 1