{
  "abstract": "Coherent motion of light scalar fields in the early Universe is typically attributed to an initial displacement, a primordial velocity, or a prescribed temperature-dependent potential. We identify a distinct microscopic mechanism in which differential thermal evolution of multiple non-aligned symmetry-breaking sources rotates the effective vacuum direction of a pseudo-Nambu--Goldstone boson (pNGB), driving motion from an initially stationary minimum. The mechanism is realized in the Majoron sector of a Type-I seesaw mechanism, where heavy neutrinos with separated thermal thresholds supply the required differential thermal evolution. For a representative benchmark, the thermal source direction rotates by $|Δθ_T|\\simeq0.76$~rad and drives the Majoron to a peak velocity $|\\dotθ|/H\\simeq0.62$, while the field tracks the moving minimum to sub-milliradian accuracy. This establishes a microscopic finite-temperature origin for pNGB motion, with implications for spontaneous leptogenesis and, more generally, for any system with multiple non-aligned symmetry-breaking sources that evolve differently with temperature.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.04265",
  "author_total": 3,
  "authors": [
    {
      "name": "Mussawir Khan"
    },
    {
      "name": "Ali Muhammad"
    },
    {
      "name": "Tianjun Li"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/egz00fhshctqa.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.04265",
  "fulltext_url": null,
  "id": "egz00fhshctqa",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.04265",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7220731268",
  "pdf_url": "https://arxiv.org/pdf/2610.04265",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/egz00fhshctqa.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2610.04265",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.04265"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Pseudo-Nambu-Goldstone Boson Motion from Thermal Thresholds",
  "title_text": "Pseudo-Nambu-Goldstone Boson Motion from Thermal Thresholds",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/egz00fhshctqa",
  "venue": "arXiv",
  "versions": []
}