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Title: Phase transitions and baryogenesis from decays

Journal Article · · Journal of High Energy Physics (Online)
 [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)

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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1407130
Journal Information:
Journal of High Energy Physics (Online), Vol. 2017, Issue 10; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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Cited By (4)

Several Problems in Particle Physics and Cosmology Solved in One SMASH text January 2019
Several Problems in Particle Physics and Cosmology Solved in One SMASH text January 2019
Several Problems in Particle Physics and Cosmology Solved in One SMASH text January 2019
Baryogenesis via Leptogenesis: Spontaneous B and L Violation text January 2021

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