Paper-boat relaxion
arXiv:1811.06520 · doi:10.1103/PhysRevD.99.095026
Abstract
A new relaxion mechanism is proposed where a small electroweak scale is preferably selected earlier than the larger one due to a potential instability, which is different from previously proposed stopping mechanisms by either Hubble friction from an increasing periodic barrier or thermal friction from gauge boson production. The sub-Planckian field excursion of an axion can be achieved without violating the bound on the -folding number from a quantum gravity perspective; and our relaxion can be identified as a QCD axion, preserving the Peccei-Quinn solution to the strong problem as well as making up all the cold dark matter in our current Universe.
v1, 6 pages, 1 figure; v2, references added, minor improvement, a misused constraint corrected; v3, accepted by PRD, discussion added, title changed from "Mexican Relaxion" to meet the journal requirement; v4, final version to match the published version
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Cited by in corpus (11)
- Recent Progress in the Physics of Axions and Axion-Like Particles
- Axion Fragmentation
- Relaxion Fluctuations (Self-stopping Relaxion) and Overview of Relaxion Stopping Mechanisms
- Gravitational Wave Echo of Relaxion Trapping
- Cosmological Relaxation through the Dark Axion Portal
- Relaxion Dark Matter
- Fast-Rolling Relaxion
- Attracting the Electroweak Scale to a Tachyonic Trap
- Gravitational tests of electroweak relaxation
- Mixing Particle Production for Relaxion Mechanism
- Axion Fragmentation on the Lattice