Phase Transitions and Baryogenesis From Decays

Abstract

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.

39 pages (29 pages + Appendices), 8 figures. V2: corrected references, submitted to JHEP. V3: version published in JHEP

References in corpus (27)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Leptogenesis
• Updated fit to three neutrino mixing: exploring the accelerator-reactor complementarity
• Flavour Matters in Leptogenesis
• Cosmological implications of the Higgs mass measurement
• Decaying warm dark matter and neutrino masses
• Quantum Boltzmann Equations and Leptogenesis
• Testability of Type I Seesaw at the CERN LHC: Revealing the Existence of the B-L Symmetry
• Signatures for right-handed neutrinos at the Large Hadron Collider
• Limits on Majoron-emitting double-beta decays of Xe-136 in the KamLAND-Zen experiment
• Baryogenesis and Gravitational Waves from Runaway Bubble Collisions
• Majorana Higgses at colliders
• X-ray photons from late-decaying majoron dark matter
• Changes in Dark Matter Properties After Freeze-Out
• Novel SM-like Higgs decay into displaced heavy neutrino pairs in U(1)' models
• Monochromatic neutrinos generated by dark matter and the see-saw mechanism
• Constraints on secret neutrino interactions after Planck
• Electroweak Resonant Leptogenesis in the Singlet Majoron Model
• Search for Majoron-emitting modes of double-beta decay of ${}^{136}$Xe with EXO-200
• Baryogenesis at a Lepton-Number-Breaking Phase Transition
• Collider signatures of sterile neutrinos in models with a gauge-singlet Higgs
• Leptogenesis with a dynamical seesaw scale
• Asymmetric Dark Matter and Baryogenesis from $SU(2{)}_{\ell }$
• Experimental Constraints on Higgs Boson Decays to TeV-scale Right-Handed Neutrinos
• A Model of Neutrino and Higgs Physics at the Electroweak Scale
• Electroweak right-handed neutrinos and new signals at the LHC

Cited by in corpus (7)

• Probing the baryogenesis and dark matter relaxed in phase transition by gravitational waves and colliders
• Leptogenesis triggered by a first-order phase transition
• Several Problems in Particle Physics and Cosmology Solved in One SMASH
• Baryogenesis via Leptogenesis: Spontaneous B and L Violation
• Leptogenesis Constraints on $B-L$ breaking Higgs Boson in TeV Scale Seesaw Models
• Baryogenesis via relativistic bubble expansion
• Leptogenesis via Varying Weinberg Operator: the Closed-Time-Path Approach