| Article | |
| Report number | arXiv:2108.11295 ; CERN-TH-2021-125 |
| Title | Cosmological Relaxation through the Dark Axion Portal |
| Author(s) | Domcke, Valerie (CERN ; Ecole Polytechnique, Lausanne) ; Schmitz, Kai (CERN) ; You, Tevong (CERN ; Cambridge U., DAMTP ; Cambridge U.) |
| Publication | 2022-07-20 |
| Imprint | 2021-08-25 |
| Number of pages | 36 |
| Note | 36 pages, 9 figures. Matches published version |
| In: | JHEP 2207 (2022) 126 |
| DOI | 10.1007/JHEP07(2022)126 |
| Subject category | astro-ph.CO ; Astrophysics and Astronomy ; hep-ph ; Particle Physics - Phenomenology |
| Abstract | The dark axion portal is a coupling of an axion-like particle to a dark photon kinetically mixed with the visible photon. We show how this portal, when applied to the relaxion, can lead to cosmological relaxation of the weak scale using dark photon production. The key backreaction mechanism involves the Schwinger effect: As long as electroweak symmetry is unbroken, Schwinger production of massless Standard Model fermions, which carry dark millicharges, suppresses the dark photon production. Once the electroweak symmetry is broken, the fermions acquire mass and the suppression is lifted. An enhanced dark photon dissipation then traps the relaxion at a naturally small weak scale. Our model thus provides a novel link between the phenomenological dark axion portal, dark photons, and the hierarchy problem of the Higgs mass. |
| Copyright/License | preprint: (License: arXiv nonexclusive-distrib 1.0) Publication: (License: CC-BY-4.0), sponsored by SCOAP³ |
Corresponding record in: Inspire
Záznam vytvorený 2021-08-27, zmenený 2023-10-04