All-in-one Relaxion, a unified solution to five BSM puzzles

Abstract

We present a unified relaxion solution to the five major outstanding issues in particle physics: the hierarchy problem, dark matter, matter-antimatter asymmetry, neutrino masses and the strong CP problem. The only additional field content in our construction with respect to standard relaxion models is an up-type vector-like fermion pair and three right-handed neutrinos charged under the relaxion shift symmetry. The observed dark matter abundance is generated automatically by oscillations of the relaxion field that begin once it is misaligned from its original stopping point after reheating. The matter-antimatter asymmetry arises from spontaneous baryogenesis induced by the CPT violation due to the rolling of the relaxion after reheating. The CPT violation is communicated to the baryons and leptons via an operator, ${\partial }_{\mu }\varphi J^{\mu }$, where $J^{\mu }$ consists of right-handed neutrino currents arising naturally from a simple neutrino mass model. Finally, the strong CP problem is solved via the Nelson-Barr mechanism, i.e. by imposing CP as a symmetry of the Lagrangian that is broken only spontaneously by the relaxion. The CP breaking is such that although an $\mathcal{O}(1)$ strong CKM phase is generated, the induced strong CP phase is much smaller, i.e., within experimental bounds.

arXiv comment8 pages, 2 figures

References in corpus (28)

• A facility to Search for Hidden Particles at the CERN SPS: the SHiP physics case
• Cosmological Relaxation of the Electroweak Scale
• The Sphaleron Rate in the Minimal Standard Model
• A Clockwork Axion
• Realizing the relaxion from multiple axions and its UV completion with high scale supersymmetry
• Flaxion: a minimal extension to solve puzzles in the standard model
• Leptogenesis with Dirac Neutrinos
• The Axiflavon
• Current unknowns in the three neutrino framework
• Standard Model-Axion-Seesaw-Higgs Portal Inflation. Five problems of particle physics and cosmology solved in one stroke
• Natural inflation with multiple sub-Planckian axions
• Unifying inflation with the axion, dark matter, baryogenesis and the seesaw mechanism
• Phenomenology of relaxion-Higgs mixing
• Relaxation from particle production
• Non-Gaussianity from Curvatons Revisited
• Is the Relaxion an Axion?
• A Simple Motivated Completion of the Standard Model below the Planck Scale: Axions and Right-Handed Neutrinos
• Coherent relaxion dark matter
• Natural Heavy Supersymmetry
• Dynamics of the cosmological relaxation after reheating
• Higgs relaxation after inflation
• The Hierarchion, a Relaxion Addressing the Standard Model's Hierarchies
• Critical Higgs inflation in a Viable Motivated Model
• Relaxation of the Composite Higgs Little Hierarchy
• The Nelson-Barr Relaxion
• Out-of-the-box Baryogenesis During Relaxation
• The Relaxion Measure Problem
• Leptogenesis in Cosmological Relaxation with Particle Production

Cited by in corpus (11)

• Gravitational Waves from First-Order Phase Transition in a Simple Axion-Like Particle Model
• Collider searches of scalar singlets across lifetimes
• Probing new physics using Rydberg states of atomic hydrogen
• Cosmological Relaxation through the Dark Axion Portal
• Slaying Axion-Like Particles via Gravitational Waves and Primordial Black Holes from Supercooled Phase Transition
• Freeze-in Axion-like Dark Matter
• Fast-Rolling Relaxion
• Electroweak baryogenesis by axionlike dark matter
• Cosmological Relaxation from Dark Fermion Production
• Gravitational tests of electroweak relaxation
• Mixing Particle Production for Relaxion Mechanism