{
  "abstract": "We investigate test particle dynamics and gravitational wave (GW) phenomenology in an exact spherically symmetric vacuum solution of Freund–Nambu scalar–tensor gravity. This framework generalizes the Janis–Newman–Winicour (JNW) naked singularity via a geometric non-linear coupling q and a direct scalar-particle coupling $$g_s$$ g s . We demonstrate that these parameters systematically modify the Innermost Stable Circular Orbit (ISCO) – which shifts inward for $$g_s > 0$$ g s > 0 – and the Marginally Bound Orbit (MBO). Furthermore, we classify bound periodic trajectories to isolate extreme zoom–whirl orbits exhibiting intense periapsis precession. By applying the Numerical Kludge method to Extreme Mass-Ratio Inspirals (EMRIs), we reveal that scalar–tensor corrections induce a macroscopic temporal dephasing in high-frequency GW bursts, even when the orbit’s spatial topology is preserved. These unique phase shifts offer a robust diagnostic signature for future space-based observatories like LISA to probe the strong-field regime and constrain scalar–tensor extensions of general relativity.",
  "abstract_shown": true,
  "affiliations": [
    "Madhabdev University",
    "Khazar University",
    "Babeş-Bolyai University",
    "Virtual University of Pakistan",
    "University of Management and Technology",
    "Zhejiang Normal University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Dhruba Jyoti Gogoi",
      "orcid": "0000-0002-4776-8506"
    },
    {
      "affs": [
        0
      ],
      "name": "Jyatsnasree Bora",
      "orcid": "0000-0001-9751-5614"
    },
    {
      "affs": [
        2
      ],
      "name": "Himanshu Chaudhary",
      "orcid": "0000-0002-6376-0707"
    },
    {
      "affs": [
        3,
        4
      ],
      "name": "M. Yousaf",
      "orcid": "0000-0001-7280-177X"
    },
    {
      "affs": [
        5
      ],
      "name": "G. Mustafa",
      "orcid": "0000-0003-1409-2009"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9sbxcj9da1hgm.bib",
  "cited_by": 0,
  "doi": "10.1140/epjc/s10052-026-16451-z",
  "fulltext_url": "https://doi.org/10.1140/epjc/s10052-026-16451-z",
  "id": "9sbxcj9da1hgm",
  "issns": [
    "1434-6044",
    "1434-6052"
  ],
  "landing_url": "https://link.springer.com/article/10.1140/epjc/s10052-026-16451-z",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [
    [
      "lcc",
      "QB460-466"
    ],
    [
      "lcc",
      "QC770-798"
    ],
    [
      "openalex",
      "3103|Pulsars and Gravitational Waves Research"
    ]
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  "openalex": "W7165687760",
  "pdf_url": "https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16451-z.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/9sbxcj9da1hgm.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:04Z",
      "native_id": "10.1140/epjc/s10052-026-16451-z",
      "source": "crossref",
      "url": "https://link.springer.com/article/10.1140/epjc/s10052-026-16451-z"
    },
    {
      "first_seen": "2026-10-30T13:46:27Z",
      "native_id": "e712328ead1c46f7819ecf6360ce2f74",
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      "url": "https://doi.org/10.1140/epjc/s10052-026-16451-z"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Pulsars and Gravitational Waves Research",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Equatorial periodic orbits and gravitational wave phenomenology around spherically-symmetric vacuum solution in Freund–Nambu scalar–tensor gravity",
  "title_text": "Equatorial periodic orbits and gravitational wave phenomenology around spherically-symmetric vacuum solution in Freund–Nambu scalar–tensor gravity",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T13:46:27Z",
  "url": "https://research.draconitic.com/paper/9sbxcj9da1hgm",
  "venue": "The European Physical Journal C",
  "versions": []
}