Leptogenesis in Cosmological Relaxation with Particle Production

Abstract

Cosmological relaxation of the electroweak scale is improved by using particle production to trap the relaxion. We combine leptogenesis with such a relaxion model that has no extremely small parameters or large e-foldings. Scanning happens after inflation--now allowed to be at a high scale--over a sub-Planckian relaxion field range for an $\mathcal{O}(100)$ TeV cut-off scale of new physics. Particle production by the relaxion also reheats the universe and generates the baryonic matter-antimatter asymmetry. We propose a realisation in which out-of-equilibrium leptons, produced by the relaxion, scatter with the thermal bath through interactions that violate CP and lepton number via higher-dimensional operators. Such a minimal effective field theory setup, with no new physics below the cut-off, naturally decouples new physics while linking leptogenesis to relaxion particle production; the baryon asymmetry of the universe can thus be intrinsically tied to a weak scale hierarchy.

arXiv commentVersion accepted for PRD; 9 pages; 4 figures; 1 table

References in corpus (27)

• The String Landscape, Black Holes and Gravity as the Weakest Force
• Monodromy in the CMB: Gravity Waves and String Inflation
• Gravity Waves and Linear Inflation from Axion Monodromy
• Cosmological Relaxation of the Electroweak Scale
• Collider Probes of Axion-Like Particles
• Naturally inflating on steep potentials through electromagnetic dissipation
• A Clockwork Axion
• Beauty is Attractive: Moduli Trapping at Enhanced Symmetry Points
• Realizing the relaxion from multiple axions and its UV completion with high scale supersymmetry
• A Clockwork Theory
• Fermion production during and after axion inflation
• Relaxation from particle production
• The Photophobic ALP
• Post-Sphaleron Baryogenesis and an Upper Limit on the Neutron-Antineutron Oscillation Time
• Neutrinoless Double Beta Decay and the Baryon Asymmetry of the Universe
• Phenomenology of fermion production during axion inflation
• Effective Lagrangian approach to neutrinoless double beta decay and neutrino masses
• Falsifying High-Scale Baryogenesis with Neutrinoless Double Beta Decay and Lepton Flavor Violation
• Dynamics of Relaxed Inflation
• Dynamics of the cosmological relaxation after reheating
• Higgs relaxation after inflation
• Particle-antiparticle asymmetries from annihilations
• Reheating-era leptogenesis
• A Dynamical Weak Scale from Inflation
• Baryon Number Violation in Particle Decays
• Revisiting the implications of CPT and unitarity for baryogenesis and leptogenesis
• The reheating era leptogenesis in models with seesaw mechanism

Cited by in corpus (11)

• Higgs relaxation after inflation
• Relaxion Fluctuations (Self-stopping Relaxion) and Overview of Relaxion Stopping Mechanisms
• Cosmological Relaxation through the Dark Axion Portal
• All-in-one Relaxion, a unified solution to five BSM puzzles
• Relaxion Dark Matter
• Freeze-in Axion-like Dark Matter
• Out-of-the-box Baryogenesis During Relaxation
• Paper-boat relaxion
• Cosmological Relaxation from Dark Fermion Production
• Gravitational tests of electroweak relaxation
• Mixing Particle Production for Relaxion Mechanism