{
  "abstract": "We develop a unified thermodynamic and mechanical framework for causal-diamond horizons in Minkowski spacetime. Euclidean regularity fixes the temperature $T_D=1/(πα)$, where $2α$ is the temporal extent of the diamond. The regulated Gibbons-Hawking-York contribution gives $I_D^E=-A_0/(4G)$, with $A_0$ the area of the horizon bifurcation surface, and the vanishing equilibrium geometric energy then yields the entropy-area relation $S_D=A_0/(4G)$. For weak matter perturbations crossing a localized portion of the future horizon, a Raychaudhuri analysis relates the associated Killing-energy flux to the area response, yielding a local physical-process first law at leading order near the bifurcation surface and, for classical matter satisfying the null energy condition, a local second law. Uniform conformal surface gravity establishes the zeroth law, while zero temperature is approached only in the limit $α\\to\\infty$, in which the finite causal horizon disappears. These results show that a coherent horizon-law structure can arise within a causal diamond, a fundamental building block of the causal structure of Minkowski spacetime. The derivation is explicit in $(2+1)$ dimensions, while the physical results retain the same form for spherical causal diamonds in $d\\geq3$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Phys. Rev. D 114, 085028 (2026)",
  "arxiv": "2610.07746",
  "author_total": 2,
  "authors": [
    {
      "name": "Carlos R. Ordóñez"
    },
    {
      "name": "Gustavo Valdivia-Mera"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5yysgszx0se5v.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.07746",
  "fulltext_url": null,
  "id": "5yysgszx0se5v",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.07746",
  "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",
      "gr-qc"
    ],
    [
      "arxiv",
      "hep-th"
    ],
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
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  ],
  "openalex": "W7220932240",
  "pdf_url": "https://arxiv.org/pdf/2610.07746",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-25",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5yysgszx0se5v.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.07746",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.07746"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-th",
      "subfield": "high-energy"
    }
  ],
  "title": "Thermodynamics and mechanical laws of causal-diamond horizons",
  "title_text": "Thermodynamics and mechanical laws of causal-diamond horizons",
  "type": "preprint",
  "updated_at": "2026-11-04T15:20:50Z",
  "url": "https://research.draconitic.com/paper/5yysgszx0se5v",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/mqsp-mwbs",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
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}