2018/11/15 by Shao-Jiang Wang · 1 voice · 13 citations
Physics and Astronomy · #Astrophysics #Axion #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Electroweak interaction #Gauge boson #Gauge theory #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum chromodynamics #Theoretical physics #Universe #astro-ph.CO #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.99.095026
published in Physical review. D/Physical review. D. 99(9) (American Physical Society) · 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
arxiv published 2018/11/15 · arxiv created 2019/05/22 · openalex publication_date 2019/05/22 · arxiv updated 2019/05/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 e-folding number from a quantum gravity perspective; our relaxion can be identified as a QCD axion, preserving the Peccei-Quinn solution to the strong CP problem as well as making up all the cold dark matter in our current Universe.