{
  "abstract": "A bstract : Metastable strings can arise from a two-step symmetry breaking chain of the type SU (2) → U (1) → 1. They can decay through quantum tunneling by nucleating a monopole-antimonopole pair, and are prominent candidates for explaining the gravitational wave background detected at Pulsar Timing Arrays (PTAs). We investigate the classical stability of the strings arising in this commonly-considered setup, which serves as a fundamental input for discussing their possible decay channels. We identify the regions of parameter space in which the strings are either classically stable or unstable. Our results show that classical instabilities can impact the parameter space relevant for PTAs. We also discuss the possible fate of the string network in the regions of classical instability.",
  "abstract_shown": true,
  "affiliations": [
    "Deutsches Elektronen-Synchrotron DESY",
    "Vrije Universiteit Brussel",
    "The International Solvay Institutes"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Simone Blasi",
      "orcid": "0000-0002-9578-624X"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Maxime Grandjean",
      "orcid": "0009-0006-4684-6118"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Alberto Mariotti",
      "orcid": "0000-0002-8320-4169"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/81527k481k9r1.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep10(2026)049",
  "fulltext_url": null,
  "id": "81527k481k9r1",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/10.1007/JHEP10(2026)049",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Pulsars and Gravitational Waves Research"
    ]
  ],
  "openalex": "W7160432886",
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP10(2026)049.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-05",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/81527k481k9r1.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:01Z",
      "native_id": "10.1007/jhep10(2026)049",
      "source": "crossref",
      "url": "https://link.springer.com/10.1007/JHEP10(2026)049"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Pulsars and Gravitational Waves Research",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Metastable strings at PTAs: classical stability analysis",
  "title_text": "Metastable strings at PTAs: classical stability analysis",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:01Z",
  "url": "https://research.draconitic.com/paper/81527k481k9r1",
  "venue": "Journal of High Energy Physics",
  "versions": []
}