{
  "abstract": "Building on the first paper in this series (Paper~I), a unified perspective on Poincaré and Galilei physics in a 5-dimensional spacetime setting is further pursued by consideration of the kinematics of general relativity, with the gravitational dynamics to be addressed separately. The metric of the 5-dimensional affine spacetimes governed by the Bargmann groups considered in Paper~I (central extensions of the Poincaré and Galilei groups) is generalized to curved spacetime by extending the usual 1+3 (traditionally `3+1') formalism of general relativity on 4-dimensional spacetime to a 1+3+1 formalism, whose spacetime kinematics is shown to be consistent with that of the usual 1+3 formalism. Spacetime tensor laws governing the motion of an elementary classical material particle and the dynamics of a simple fluid are presented, along with their 1+3+1 decompositions; these reference the foliation of spacetime in a manner that partially reverts the Einstein perspective (accelerated fiducial observers, and geodesic material particles and fluid elements) to a Newton-like perspective (geodesic fiducial observers, and accelerated material particles and fluid elements subject to a gravitational force). These spacetime laws of motion for particles and fluids also suggest that a strong-field Galilei general relativity would involve a limit in which not only $c \\rightarrow \\infty$, but also $G \\rightarrow \\infty$, such that $G / c^2$ remains constant.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Symmetry (2025), 17, 1245",
  "arxiv": "2611.05425",
  "author_total": 1,
  "authors": [
    {
      "name": "Christian Y. Cardall"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ad4tbzzzgfmth.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.05425",
  "fulltext_url": null,
  "id": "ad4tbzzzgfmth",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.05425",
  "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",
      "physics.gen-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.05425",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ad4tbzzzgfmth.ris",
  "sources": [
    {
      "first_seen": "2026-11-05T15:20:56Z",
      "native_id": "2611.05425",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.05425"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.gen-ph",
      "subfield": "general"
    }
  ],
  "title": "A Unified Perspective on Poincaré and Galilei Relativity: II. General Relativity: A. Kinematics",
  "title_text": "A Unified Perspective on Poincaré and Galilei Relativity: II. General Relativity: A. Kinematics",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:18Z",
  "url": "https://research.draconitic.com/paper/ad4tbzzzgfmth",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.3390/sym17081245",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}