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

Abstract

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.

Authors:
 [1]; ORCiD logo [2]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Durham Univ. (United Kingdom)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); European Research Council (ERC)
OSTI Identifier:
1471727
Report Number(s):
arXiv:1808.00470; IPPP/18/65; FERMILAB-PUB-18-329-T
Journal ID: ISSN 1029-8479; oai:inspirehep.net:1684793
Grant/Contract Number:  
AC02-07CH11359; FP7-IDEAS-ERC; ERC-CG-617143
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2020; Journal Issue: 1; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Cosmology of Theories Beyond the SM; CP Violation; Neutrino Physics; Thermal Field Theory

Citation Formats

Turner, Jessica, and Zhou, Ye-Ling. Leptogenesis via varying Weinberg operator: the Closed-Time-Path approach. United States: N. p., 2020. Web. doi:10.1007/JHEP01(2020)022.
Turner, Jessica, & Zhou, Ye-Ling. Leptogenesis via varying Weinberg operator: the Closed-Time-Path approach. United States. doi:10.1007/JHEP01(2020)022.
Turner, Jessica, and Zhou, Ye-Ling. Tue . "Leptogenesis via varying Weinberg operator: the Closed-Time-Path approach". United States. doi:10.1007/JHEP01(2020)022. https://www.osti.gov/servlets/purl/1471727.
@article{osti_1471727,
title = {Leptogenesis via varying Weinberg operator: the Closed-Time-Path approach},
author = {Turner, Jessica and Zhou, Ye-Ling},
abstractNote = {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.},
doi = {10.1007/JHEP01(2020)022},
journal = {Journal of High Energy Physics (Online)},
number = 1,
volume = 2020,
place = {United States},
year = {2020},
month = {1}
}

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