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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];  [2]
  1. Fermilab
  2. Durham U., IPPP
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)
OSTI Identifier:
1471727
Report Number(s):
arXiv:1808.00470; IPPP/18/65; FERMILAB-PUB-18-329-T
1684793
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Turner, Jessica, and Zhou, Ye-Ling. Leptogenesis via Varying Weinberg Operator: the Closed-Time-Path Approach. United States: N. p., 2018. Web.
Turner, Jessica, & Zhou, Ye-Ling. Leptogenesis via Varying Weinberg Operator: the Closed-Time-Path Approach. United States.
Turner, Jessica, and Zhou, Ye-Ling. Wed . "Leptogenesis via Varying Weinberg Operator: the Closed-Time-Path Approach". United States. 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 = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {8}
}