{
  "abstract": "String compactifications and runaway-dilaton models can contain light scalar directions. Motion along these directions changes gauge couplings, the QCD scale, quark masses, and Yukawa parameters. A given string-derived sector then predicts low-energy slopes. Its gauge kinetic functions, matter-metric or Yukawa slopes, source charge, scalar trajectory, and scalar range determine a Damour--Donoghue weak-equivalence-principle (WEP) vector and a clock-drift vector. The fit assumes one long-range scalar or an aligned multi-field direction. With that assumption, WEP tests and secular clock drifts probe related projections of the same scalar-slope vector. The minimal two-charge Damour--Donoghue fit uses Ti--Pt MICROSCOPE, Be--Ti torsion-balance, and $^{85}$Rb--$^{87}$Rb atom-interferometer data, then adds the Yb$^+$ E3/E2 secular $α$-drift row. The WEP-only fit gives $D_{\\hat m}=(-6.06\\pm34.91)\\times10^{-12}$ and $D_e=(8.80\\pm46.46)\\times10^{-12}$, with correlation $-0.99958$. The clock input is $\\dotα/α=1.0(1.1)\\times10^{-18}\\,{\\rm yr}^{-1}$. It matches the WEP marginal reach when $|ζ|=2.37\\times10^{-8}\\,{\\rm yr}^{-1}$, with $ζ=\\dotφ/α_E$. For the benchmark $\\dotφ=ξH_0$ and $α_E=10^{-3}α_0$, this gives $ξ/α_0\\simeq0.34$. A model becomes testable after it supplies $r=D_{\\hat m}/D_e$, the scalar amplitude, and $ζ$. The Damour--Piazza--Veneziano runaway-dilaton estimate lies near $η\\sim10^{-12}$ for order-unity $n=2$ parameters, well above the MICROSCOPE-level WEP scale. In the representative-isotope two-charge model, a MICROSCOPE-level Be--Ti-like row would reduce the long WEP axis by a factor $27.8$; a repeated Ti--Pt-like row would barely change it. The calculation tests compactification-level predictions for string-derived dilaton or modulus sectors after the model supplies its low-energy data.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: J. Phys. G: Nucl. Part. Phys. 53 (2026) 115002",
  "arxiv": "2610.35947",
  "author_total": 1,
  "authors": [
    {
      "name": "Ahmed Farag Ali"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/13hnd6311c3jj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.35947",
  "fulltext_url": null,
  "id": "13hnd6311c3jj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.35947",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "gr-qc"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "arxiv",
      "hep-th"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.35947",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/13hnd6311c3jj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:50Z",
      "native_id": "2610.35947",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.35947"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Clock--WEP Tests of String-Derived Dilaton and Modulus Sectors",
  "title_text": "Clock--WEP Tests of String-Derived Dilaton and Modulus Sectors",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:38Z",
  "url": "https://research.draconitic.com/paper/13hnd6311c3jj",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1088/1361-6471/aeb8a2",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}