{
  "abstract": "We study the shape of three-dimensional and projected dark-matter halo profiles extracted from cosmological $N$-body simulations in $Λ$CDM and non-standard cosmologies, using the \\texttt{DUSTGRAIN-PF} and \\texttt{DEMNUni} suites. The models considered include massive neutrinos, $f(\\mathcal{R})$ gravity, and dynamical dark energy. By comparing density, mass, velocity-dispersion, and excess-surface-density profiles up to $5\\,r_{500{\\rm c}}$, we quantify the differential imprint of non-standard physics on halo structure in view of \\textit{Euclid} cluster WL studies. Our main analysis is performed at $z=1.1$, a high-redshift regime where the weak-lensing signal-to-noise starts to degrade, providing a conservative stress test for detectability; for \\texttt{DUSTGRAIN-PF} we additionally analyse $z=0.5$ and $z=0.3$ snapshots. In low-mass haloes ($M_{\\rm 200c}<7\\times10^{13}\\,M_\\odot$), $f(\\mathcal{R})$ gravity produces deviations of order $10\\,\\%$ in projected and three-dimensional profiles, especially in the outskirts where screening is less efficient. Massive neutrinos partially reduce this signal, reflecting the competition between free streaming and fifth-force-enhanced growth. Dynamical dark energy and massive-neutrino cosmologies generally induce smaller, few-percent deviations, with the largest effects again found in low-mass haloes and at large radii. Under simplified assumptions for \\Euclid WL, detecting such profile differences at $z=1.1$ requires stacks of $\\sim10^5$ haloes, while a few thousands haloes may be sufficient at $z\\lesssim0.5$. This further calls for the need of integrating such precise modelling of non-standard effects -- along with other observational effects -- in any likelihood involving \\textit{Euclid} WL masses to avoid non-negligible systematic biases. Concentration--mass relations show weaker cosmology dependence, typically at the $\\sim5\\,\\%$ level. [...]",
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  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.04192",
  "author_total": 306,
  "authors": [
    {
      "name": "L Pizzuti"
    },
    {
      "name": "G.Y Ferron"
    },
    {
      "name": "A Ragagnin"
    },
    {
      "name": "A.M.C Le Brun"
    },
    {
      "name": "P.-S Corasaniti"
    },
    {
      "name": "T Gayoux"
    },
    {
      "name": "G Rácz"
    },
    {
      "name": "E Altamura"
    },
    {
      "name": "Z Sakr"
    },
    {
      "name": "C Carbone"
    },
    {
      "name": "M Baldi"
    },
    {
      "name": "C Giocoli"
    },
    {
      "name": "T Castro"
    },
    {
      "name": "F Pace"
    },
    {
      "name": "J.E Taylor"
    },
    {
      "name": "S Borgani"
    },
    {
      "name": "O Luongo"
    },
    {
      "name": "C.T Mpetha"
    },
    {
      "name": "R.E Angulo"
    },
    {
      "name": "B Altieri"
    },
    {
      "name": "S Andreon"
    },
    {
      "name": "N Auricchio"
    },
    {
      "name": "C Baccigalupi"
    },
    {
      "name": "S Bardelli"
    },
    {
      "name": "P Battaglia"
    },
    {
      "name": "A Biviano"
    },
    {
      "name": "E Branchini"
    },
    {
      "name": "M Brescia"
    },
    {
      "name": "S Camera"
    },
    {
      "name": "V Capobianco"
    },
    {
      "name": "V.F Cardone"
    },
    {
      "name": "J Carretero"
    },
    {
      "name": "M Castellano"
    },
    {
      "name": "G Castignani"
    },
    {
      "name": "S Cavuoti"
    },
    {
      "name": "K.C Chambers"
    },
    {
      "name": "A Cimatti"
    },
    {
      "name": "C Colodro-Conde"
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    {
      "name": "G Congedo"
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    {
      "name": "L Conversi"
    },
    {
      "name": "Y Copin"
    },
    {
      "name": "F Courbin"
    },
    {
      "name": "H.M Courtois"
    },
    {
      "name": "M Cropper"
    },
    {
      "name": "H Degaudenzi"
    },
    {
      "name": "G de Lucia"
    },
    {
      "name": "H Dole"
    },
    {
      "name": "F Dubath"
    },
    {
      "name": "X Dupac"
    },
    {
      "name": "S Dusini"
    },
    {
      "name": "S Escoffier"
    },
    {
      "name": "M Farina"
    },
    {
      "name": "F Faustini"
    },
    {
      "name": "S Ferriol"
    },
    {
      "name": "F Finelli"
    },
    {
      "name": "P Fosalba"
    },
    {
      "name": "S Fotopoulou"
    },
    {
      "name": "M Frailis"
    },
    {
      "name": "E Franceschi"
    },
    {
      "name": "M Fumana"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0nfgn59e2z83r.bib",
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  "doi": "10.48550/arxiv.2609.04192",
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  "pdf_url": "https://arxiv.org/pdf/2609.04192",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0nfgn59e2z83r.ris",
  "sources": [
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      "first_seen": "2026-10-30T12:17:37Z",
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      "url": "https://arxiv.org/abs/2609.04192"
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  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
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    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
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  ],
  "title": "Euclid preparation. The shape of halo profiles in $Λ$CDM and non-standard cosmologies",
  "title_text": "Euclid preparation. The shape of halo profiles in ΛCDM and non-standard cosmologies",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:31Z",
  "url": "https://research.draconitic.com/paper/0nfgn59e2z83r",
  "venue": "HAL",
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