{
  "id": "2201.02317",
  "version": "v2",
  "published": "2022-01-07T03:54:18.000Z",
  "updated": "2022-05-13T15:57:35.000Z",
  "title": "Gravitational wave background from non-Abelian reheating after axion-like inflation",
  "authors": [
    "P. Klose",
    "M. Laine",
    "S. Procacci"
  ],
  "comment": "18 pages. v2: clarifications added",
  "journal": "JCAP 05 (2022) 021",
  "doi": "10.1088/1475-7516/2022/05/021",
  "categories": [
    "hep-ph",
    "astro-ph.CO"
  ],
  "abstract": "A pseudoscalar inflaton $\\varphi$, coupled to the topological charge density $F\\tilde{F}$ of a non-Abelian sector, can decay to gauge bosons ($\\varphi\\to g g $), which may thermalize rapidly. The friction felt by $\\varphi$ is then increased by non-Abelian \"strong sphalerons\", leading to a self-amplifying process that can efficiently heat up the medium. We determine a lower bound for the gravitational wave production rate from such a process, originating via hydrodynamic fluctuations and particle collisions, in terms of a minimal number of parameters. Only a moderate fraction of energy density is converted to gravitational waves, suggesting that non-Abelian models may avoid the overproduction observed in some Abelian cases.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2022-05-13T15:57:35.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "gravitational wave background",
      "axion-like inflation",
      "non-abelian reheating",
      "gravitational wave production rate",
      "charge density"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "IOP",
      "journal": "J. Cosmol. Astropart. Phys."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}