{
  "abstract": "We present a sound-horizon-agnostic forecast for constraints on the Hubble constant $H_0$ and the sum of the neutrino masses $Σm_ν$ from a combination of LSST-like galaxy weak lensing, Simons-Observatory-like CMB lensing, the completed DESI BAO program, and expanded supernova samples. Treating the sound horizon at baryon drag $r_d$ as a free parameter, the method provides a consistency test of $Λ$CDM without relying on the standard early-Universe calibration of $r_d$. The analysis incorporates realistic galaxy weak-lensing systematics, explicitly marginalizing over photometric-redshift calibration, multiplicative shear biases, intrinsic alignments, and baryonic feedback, and extends the CMB-lensing analysis to $L_{\\max}=5000$. For fixed $Σm_ν$, we forecast uncertainties of $σ(H_0)\\simeq 1.5$ km/s/Mpc with our least informative prior set, $σ(H_0)\\simeq 1.3$ km/s/Mpc with more restrictive priors, and $σ(H_0)\\simeq 0.7$ km/s/Mpc with an additional informative prior on the amplitude of primordial fluctuations $A_s$. Allowing $Σm_ν$ to vary weakens the $H_0$ constraints, while still yielding a forecast 95% CL upper limit of about 0.4 eV on $Σm_ν$. We also clarify the scope of the $r_d$-agnostic approach through validation tests using mock data from modified recombination and early dark energy models. The method recovers unbiased constraints on $H_0$ for the former but not the latter, highlighting its dependence on assumptions about early-Universe physics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.31660",
  "author_total": 5,
  "authors": [
    {
      "name": "Seyed Hamidreza Mirpoorian"
    },
    {
      "name": "Helena García Escudero"
    },
    {
      "name": "Levon Pogosian"
    },
    {
      "name": "Amy Wayland"
    },
    {
      "name": "David Alonso"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/296dxada9gv1h.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.31660",
  "fulltext_url": null,
  "id": "296dxada9gv1h",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.31660",
  "language": "en",
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.astr"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7223271401",
  "pdf_url": "https://arxiv.org/pdf/2610.31660",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/296dxada9gv1h.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:34Z",
      "native_id": "2610.31660",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.31660"
    },
    {
      "first_seen": "2026-11-04T12:20:53Z",
      "native_id": "hal-05851341",
      "source": "hal",
      "url": "https://hal.science/hal-05851341v1"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "hal:0.phys",
      "subfield": "general"
    }
  ],
  "title": "Sound-Horizon-Agnostic Forecast for Constraints on $H_0$ and $Σm_ν$ from BAO, CMB Lensing, Supernovae and LSST-like Galaxy Lensing",
  "title_text": "Sound-Horizon-Agnostic Forecast for Constraints on H_0 and Σm_ν from BAO, CMB Lensing, Supernovae and LSST-like Galaxy Lensing",
  "type": "preprint",
  "updated_at": "2026-11-06T12:20:44Z",
  "url": "https://research.draconitic.com/paper/296dxada9gv1h",
  "venue": "arXiv",
  "versions": []
}