Leptogenesis via varying Weinberg operator: the Closed-Time-Path approach

Turner, Jessica; Zhou, Ye-Ling

doi:10.1007/JHEP01(2020)022

Title: Leptogenesis via varying Weinberg operator: the Closed-Time-Path approach

Journal Article · 06 January 2020 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/JHEP01(2020)022 · OSTI ID:1471727

Turner, Jessica ^[1];

^[2]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Durham Univ. (United Kingdom)

In this work we provide a detailed study of the CP violating phase transition (CPPT) which is a new mechanism proposed to produce a baryon asymmetry. This mechanism exploits the Weinberg operator whose coefficient is dynamically realised from the vacuum expectation values (VEVs) of new scalars. In the specific case of the first order phase transition, the scalar VEVs vary in the bubble wall which separates the two phases. This results in a spacetime varying coefficient for the Weinberg operator. The interference of two Weinberg operators at different spacetime points generates a CP asymmetry between lepton and anti-lepton production/annihilation processes, which eventually results in an asymmetry between baryon and anti-baryon number densities in the early Universe. We present the calculation of the lepton asymmetry, based on non-equilibrium quantum field theory methods, in full. We consider the influence of the bubble wall characteristics and the impact of thermal effects on the lepton asymmetry and draw a comparison between the CPPT mechanism and electroweak baryogenesis.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); European Research Council (ERC)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1471727

Report Number(s):: arXiv:1808.00470; IPPP/18/65; FERMILAB-PUB--18-329-T; oai:inspirehep.net:1684793

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 1 Vol. 2020; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Cosmology of Theories Beyond the SM
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