{
  "abstract": "Fragility and fictive temperature are two central measures of glass formation, but their connection is usually expressed indirectly through structural relaxation times or cooling-rate dependence. Here we formulate this connection in terms of configurational enthalpy fluctuations. The time evolution of the fictive temperature during cooling or aging is controlled by the enthalpy--enthalpy correlation function that also determines the frequency-dependent configurational heat capacity. Fragility enters through the strong temperature dependence of the structural relaxation time and therefore controls how rapidly the corresponding enthalpy-relaxation spectrum shifts to long times near the glass transition. This leads to a direct time-domain description of the onset and growth of the fictive-temperature lag, including the Debye limit, and connects calorimetric relaxation, fragility, and nonequilibrium structural arrest within a common framework.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.07396",
  "author_total": 1,
  "authors": [
    {
      "name": "Biman Bagchi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c2xbj3qyc9x4j.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.07396",
  "fulltext_url": null,
  "id": "c2xbj3qyc9x4j",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.07396",
  "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",
      "cond-mat.stat-mech"
    ],
    [
      "openalex",
      "2505|Material Dynamics and Properties"
    ]
  ],
  "openalex": "W7212046797",
  "pdf_url": "https://arxiv.org/pdf/2609.07396",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/c2xbj3qyc9x4j.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:48Z",
      "native_id": "2609.07396",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.07396"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.stat-mech",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Fragility from Enthalpy Fluctuations and Fictive-Temperature Dynamics",
  "title_text": "Fragility from Enthalpy Fluctuations and Fictive-Temperature Dynamics",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:48Z",
  "url": "https://research.draconitic.com/paper/c2xbj3qyc9x4j",
  "venue": "arXiv",
  "versions": []
}