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Title: Phase transitions and baryogenesis from decays

Abstract

Here, we study scenarios in which the baryon asymmetry is generated from the decay of a particle whose mass originates from the spontaneous breakdown of a symmetry. This is realized in many models, including low-scale leptogenesis and theories with classical scale invariance. Symmetry breaking in the early universe proceeds through a phase transition that gives the parent particle a time-dependent mass, which provides an additional departure from thermal equilibrium that could modify the efficiency of baryogenesis from out-of-equilibrium decays. We characterize the effects of various types of phase transitions and show that an enhancement in the baryon asymmetry from decays is possible if the phase transition is of the second order, although such models are typically fine-tuned. We also stress the role of new annihilation modes that deplete the parent particle abundance in models realizing such a phase transition, reducing the efficacy of baryogenesis. A proper treatment of baryogenesis in such models therefore requires the inclusion of the effects we study in this paper.

Authors:
 [1];  [2]
  1. Harvey Mudd College, Claremont, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Durham Univ., Durham (United Kingdom)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1407130
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 10; 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; Neutrino Physics; Spontaneous Symmetry Breaking; Thermal Field Theory

Citation Formats

Shuve, Brian, and Tamarit, Carlos. Phase transitions and baryogenesis from decays. United States: N. p., 2017. Web. doi:10.1007/jhep10(2017)122.
Shuve, Brian, & Tamarit, Carlos. Phase transitions and baryogenesis from decays. United States. doi:10.1007/jhep10(2017)122.
Shuve, Brian, and Tamarit, Carlos. Wed . "Phase transitions and baryogenesis from decays". United States. doi:10.1007/jhep10(2017)122. https://www.osti.gov/servlets/purl/1407130.
@article{osti_1407130,
title = {Phase transitions and baryogenesis from decays},
author = {Shuve, Brian and Tamarit, Carlos},
abstractNote = {Here, we study scenarios in which the baryon asymmetry is generated from the decay of a particle whose mass originates from the spontaneous breakdown of a symmetry. This is realized in many models, including low-scale leptogenesis and theories with classical scale invariance. Symmetry breaking in the early universe proceeds through a phase transition that gives the parent particle a time-dependent mass, which provides an additional departure from thermal equilibrium that could modify the efficiency of baryogenesis from out-of-equilibrium decays. We characterize the effects of various types of phase transitions and show that an enhancement in the baryon asymmetry from decays is possible if the phase transition is of the second order, although such models are typically fine-tuned. We also stress the role of new annihilation modes that deplete the parent particle abundance in models realizing such a phase transition, reducing the efficacy of baryogenesis. A proper treatment of baryogenesis in such models therefore requires the inclusion of the effects we study in this paper.},
doi = {10.1007/jhep10(2017)122},
journal = {Journal of High Energy Physics (Online)},
number = 10,
volume = 2017,
place = {United States},
year = {Wed Oct 18 00:00:00 EDT 2017},
month = {Wed Oct 18 00:00:00 EDT 2017}
}

Journal Article:
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