{
  "abstract": "We investigate dark matter (DM) interpretations of the Galactic Center Excess (GCE) using 17.7 years of Fermi-LAT data and the FL16Y source catalog. We test 80 Galactic diffuse-emission models and include correlated systematic uncertainties from Galactic-plane control regions. We derive combined 95\\% CL annihilation limits from 30 dwarf spheroidal galaxies (dSphs), including $J$-factor uncertainties, and compare the GCE-preferred regions with these limits and AMS-02 antiproton bounds. For self-conjugate DM, we study two-body annihilation, effective $4b$, $4τ$, and $2b2τ$ channels, and cascades through on-shell scalar mediators. For Model X, the best-fitting diffuse-emission model in our template analysis including a DM component, the dSph limits exclude the 68\\% CL GCE regions for $b\\bar b$, $c\\bar c$, light quarks, gluons, and effective $4b$ and $2b2τ$. Parts of the $τ^+τ^-$ and effective $4τ$ regions remain compatible, although their best-fit points exceed these limits. Heavy two-body final states are less constrained but fit the GCE less well. Mediator masses affect both the preferred regions and the constraints. Part of the 68\\% CL $4b$ cascade region remains below the dSph limits for $r=m_{\\rm mediator}/m_{\\rm DM}\\lesssim0.4$. Among the four-body benchmarks, $4τ$ retains a comparatively large preferred region compatible with dSph and antiproton bounds. With the adopted BIG propagation model, antiproton bounds are generally weaker but constrain part of the $4b$ cascade region. Finally, we examine a secluded singlet fermionic DM benchmark with a predominantly four-bottom cascade.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.26648",
  "author_total": 3,
  "authors": [
    {
      "name": "Sang Hwan Kim"
    },
    {
      "name": "Hae Barg Kang"
    },
    {
      "name": "Seodong Shin"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2fj2ddn76w6ev.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.26648",
  "fulltext_url": null,
  "id": "2fj2ddn76w6ev",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.26648",
  "language": null,
  "licence": "CC0-1.0",
  "licence_label": "CC0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/publicdomain/zero/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7223030328",
  "pdf_url": "https://arxiv.org/pdf/2610.26648",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2fj2ddn76w6ev.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2610.26648",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.26648"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Dark Matter Interpretations of the Galactic Center Gamma-Ray Excess with 18 Years of Fermi-LAT Data and the FL16Y Source Catalog",
  "title_text": "Dark Matter Interpretations of the Galactic Center Gamma-Ray Excess with 18 Years of Fermi-LAT Data and the FL16Y Source Catalog",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/2fj2ddn76w6ev",
  "venue": "arXiv",
  "versions": []
}