{
  "abstract": "We present the first end-to-end validation of the Euclid baryon acoustic oscillation (BAO) analysis pipeline, encompassing density-field reconstruction, two-point correlation function measurement, and cosmological parameter inference. Using eight Euclid-like mock catalogues extracted from each of the four snapshots of the Flagship 1 (FS1) simulation, which is designed to replicate the statistical properties of the first Euclid data release (DR1), we assessed the performance of the two standard BAO reconstruction methods based on the Zeldovich approximation, RECSYM and RECISO, in four redshift snapshots (0.9 ≤ z ≤ 1.8). The pipeline introduces several methodological advances: an emulator-based model evaluator (Bora.jl) combined with a Hamiltonian Monte Carlo sampler (NUTS), achieving a speed-up of more than 500 times relative to standard Monte Carlo Markov chains, and a semi-analytical covariance estimator (BeXiCov+WinCov) that enables robust error estimates with only eight mock realisations and remains stable under variations in the fiducial cosmology. Together, these components ensure computational efficiency while significantly reducing the risk of underestimating the parameter uncertainties. The two reconstruction schemes yield unbiased BAO measurements for all redshifts and user-defined choices, including the smoothing scale and fiducial cosmology. In each snapshot, reconstruction enhances the figure of merit for {Ωm, H0rs} by a factor of ∼3, which is equivalent to tripling the effective survey volume. When we combined the four redshift bins, the improvement remained substantial, with BAO-only constraints reaching ∼10% precision on Ωm and ∼3% on H0rs. The results from RECSYM and RECISO are consistent within the uncertainties, but we recommend RECSYM during testing because its sensitivity to covariance variations is lower. These findings establish the accuracy, robustness, and scalability of the Euclid BAO pipeline for DR1 and provide a solid foundation for future cosmological analyses.",
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  "affiliations": [
    "INAF-Osservatorio Astronomico di Trieste",
    "INAF-Osservatorio Astronomico di Brera",
    "Waterloo Centre for Astrophysics, University of Waterloo",
    "Dipartimento di Fisica “Aldo Pontremoli”, Università degli Studi di Milano",
    "Institute of Space Sciences (ICE, CSIC), Campus UAB",
    "Dipartimento di Fisica, Università di Genova",
    "SISSA, International School for Advanced Studies",
    "IFPU, Institute for Fundamental Physics of the Universe",
    "Dipartimento di Fisica – Sezione di Astronomia, Università di Trieste",
    "Aix-Marseille Université, CNRS/IN2P3, CPPM",
    "Institute of Cosmology and Gravitation, University of Portsmouth",
    "Universität Bonn, Argelander-Institut für Astronomie",
    "Max Planck Institute for Extraterrestrial Physics",
    "Aix-Marseille Université, Université de Toulon, CNRS, CPT",
    "INAF-IASF Milano",
    "Department of Physics and Astronomy, University of Waterloo, Waterloo",
    "Dipartimento di Fisica e Astronomia, Università di Bologna",
    "Center for Astrophysics | Harvard & Smithsonian",
    "Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill",
    "Dipartimento di Fisica, Università di Roma Tor Vergata",
    "Univ. Lille, CNRS, Centrale Lille, UMR 9189 CRIStAL",
    "ESAC/ESA, Camino Bajo del Castillo",
    "INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna",
    "Department of Physics “E. Pancini”, University Federico II",
    "Dipartimento di Fisica, Università degli Studi di Torino",
    "Leiden Observatory, Leiden University",
    "INAF-Osservatorio Astrofisico di Torino",
    "Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT)",
    "INAF-Osservatorio Astronomico di Roma",
    "INAF-Osservatorio Astronomico di Capodimonte",
    "Institute for Astronomy, University of Hawaii",
    "Dipartimento di Fisica e Astronomia “Augusto Righi” – Alma Mater Studiorum Università di Bologna",
    "Instituto de Astrofísica de Canarias",
    "European Space Agency/ESRIN",
    "Université Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822",
    "Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (IEEC-UB)",
    "UCB Lyon 1, CNRS/IN2P3, IUF, IP2I Lyon",
    "Department of Astronomy, University of Geneva",
    "Aix-Marseille Université, CNRS, CNES, LAM"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 298,
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  "bibtex": "https://research.draconitic.com/paper/d5rtqqz71sa6a.bib",
  "cited_by": 0,
  "doi": "10.1051/0004-6361/202660781",
  "fulltext_url": "https://www.aanda.org/articles/aa/full_html/2026/11/aa60781-26/aa60781-26.html",
  "id": "d5rtqqz71sa6a",
  "issns": [
    "0004-6361",
    "1432-0746"
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  "landing_url": "https://doi.org/10.1051/0004-6361/202660781",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
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  "published": "2026-11-04",
  "publisher": "EDP Sciences",
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  "title": "Euclid preparation",
  "title_text": "Euclid preparation",
  "type": "peer-reviewed",
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  "url": "https://research.draconitic.com/paper/d5rtqqz71sa6a",
  "venue": "Astronomy & Astrophysics",
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