{
  "abstract": "We introduce a flexible mixture model for the joint source-frame component-mass distribution of compact binaries, inferred simultaneously with cosmology, together with a framework that identifies structures in the reconstructed density, quantifying their posterior stability, local prominence, and cosmological relevance. Applied to GWTC-5.0, the workflow clarifies several familiar and emergent structures. The $\\sim35~M_\\odot$ feature is classified as a clear near-equal-mass peak despite an ambiguous interpretation in the primary-mass projection. A weaker unequal-mass concentration near $(21,12)~M_\\odot$ is recovered frequently but with lower prominence. A tentative joint transition near $60~M_\\odot$ appears at mildly unequal masses, with a more robust manifestation in the primary-mass projection. For cosmology, the two-dimensional mass model constraint on $H_0$ is $33\\%$ narrower than a model that flexibly reconstructs only the primary mass, and only $\\sim~10\\%$ wider than analyses based on strongly parameterized one-dimensional spectral structure. At the feature level, we show that the $\\sim10~M_\\odot$ and $\\sim35~M_\\odot$ concentrations depend on $H_0$ mainly through a common scale which captures the entire $\\sim~(1+z)$ cosmological rescaling of both masses; the intermediate unequal-mass feature instead retains residual dependence in the orthogonal mass-ratio direction. More generally, we argue that population prominence, formal inclusion in an astrophysical feature catalogue, and cosmological relevance need not coincide. These results suggest that a genuinely two-dimensional view may be required to fully exploit spectral-siren information. Our workflow provides a reproducible way to detect population structure and identify which aspects of its geometry are associated with spectral-siren constraints. The feature finder is directly applicable to other population reconstructions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.10535",
  "author_total": 3,
  "authors": [
    {
      "name": "Viola de Renzis"
    },
    {
      "name": "Alessandro Agapito"
    },
    {
      "name": "Michele Mancarella"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cp8brrxgv3jwn.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.10535",
  "fulltext_url": null,
  "id": "cp8brrxgv3jwn",
  "issns": [],
  "landing_url": "https://hal.science/hal-05835152v1",
  "language": "en",
  "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.CO"
    ],
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "gr-qc"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.grqc"
    ],
    [
      "openalex",
      "3103|Pulsars and Gravitational Waves Research"
    ]
  ],
  "openalex": "W7220894734",
  "pdf_url": "https://arxiv.org/pdf/2610.10535",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cp8brrxgv3jwn.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:00Z",
      "native_id": "hal-05835152",
      "source": "hal",
      "url": "https://hal.science/hal-05835152v1"
    },
    {
      "first_seen": "2026-10-30T12:27:54Z",
      "native_id": "2610.10535",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.10535"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    }
  ],
  "title": "A weakly modelled view of the joint compact-binary mass plane: population structure and spectral-siren cosmology",
  "title_text": "A weakly modelled view of the joint compact-binary mass plane: population structure and spectral-siren cosmology",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:54Z",
  "url": "https://research.draconitic.com/paper/cp8brrxgv3jwn",
  "venue": "HAL",
  "versions": []
}