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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

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


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OKM-raportointi: Kyllä

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Viimeisin päivitys 2021-29-11 klo 15:13