{
  "id": "2506.16223",
  "version": "v1",
  "published": "2025-06-19T11:28:24.000Z",
  "updated": "2025-06-19T11:28:24.000Z",
  "title": "Observational Constraints on Scalar Field--Matter Interaction in Weyl Integrable Spacetime",
  "authors": [
    "Andronikos Paliathanasis"
  ],
  "comment": "12 pages, 2 figures",
  "categories": [
    "gr-qc",
    "astro-ph.CO",
    "hep-th"
  ],
  "abstract": "We test an analytic cosmological solution within the framework of Weyl Integrable Spacetime using current observational data. In this model, dark energy is described by a pressureless fluid, while a scalar field arises naturally through the definition of the connection. This gravitational theory reveals a Chameleon Mechanism leading to a nonzero interaction between the scalar field and the matter sector. This model extends the standard $\\Lambda $CDM cosmology by introducing one additional degree of freedom, allowing for deviations from $\\Lambda$CDM dynamics. For the observational constraints we consider the Supernova data of Pantheon+ collaboration, the Cosmic Chronometers, the Baryonic Acoustic Oscillators of DESI DR2 collaboration and the gamma-ray bursts. We find that Weyl Integrable Spacetime fits the data in a better way than the $\\Lambda$CDM. When all datasets are considered, the statistical comparison indicates a weak to moderate preference for Weyl Integrable Spacetime according to the Akaike Information Criterion and Jeffrey's scale for the Bayesian evidence.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2025-06-19T11:28:24.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "scalar field-matter interaction",
      "observational constraints",
      "weyl integrable spacetime fits",
      "current observational data",
      "scalar field arises"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}