DOE OSTI · 3375629
Fiducial-cosmology-dependent systematics for the DESI 2024 full-shape analysis
Abstract
We assess the impact of the fiducial cosmology choice on cosmological inference from full-shape (FS) fits of the galaxy power spectrum in the DESI 2024 Data Release 1 (DR1). Using a suite of AbacusSummit DR1 mock catalogues based on the Planck 2018 best-fit cosmology, we quantify potential systematic shifts introduced by analysing the data under five secondary cosmologies — featuring variations in matter density, thawing dark energy, higher effective number of neutrino species, reduced clustering amplitude, and the DESI DR1 BAO best-fit w 0 w a CDM cosmology — relative to DESI's baseline Planck 2018 cosmology. We investigate two complementary FS analysis approaches: full-modelling (FM) and ShapeFit (SF), each with distinct sensitivities to the assumed fiducial model. Across all tracers, we find for FM that systematic shifts induced by fiducial cosmology mismatches remain well below the DESI DR1 statistical uncertainties, with maximum deviations of 0.22σ DR1 in ΛCDM scenarios and 0.12σ DR1+SN when including SN Ia mock data in extended w 0 w a CDM fits. For SF, the shifts in the compressed parameters remain below 0.45σ DR1 for all tracers and cosmologies.
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Gsponer, R. [Institute of Physics, Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, Chemin Pegasi 51, CH-1290 Versoix,] (ORCID:0000000275407601), Ramirez-Solano, S. [Instituto de Física, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica, Ciudad Universitaria, Cd. de México C. P. 04510,; Instituto de Ciencias Físicas, Universidad Autónoma de México, Cuernavaca, Morelos, 62210,] (ORCID:0009000620967974), Rodríguez-Martínez, F. [Instituto de Física, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica, Ciudad Universitaria, Cd. de México C. P. 04510,; Instituto de Ciencias Físicas, Universidad Autónoma de México, Cuernavaca, Morelos, 62210,], Vargas-Magaña, M. [Instituto de Física, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica, Ciudad Universitaria, Cd. de México C. P. 04510,] (ORCID:0000000338411836), Novell-Masot, S. [Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (UB), c. Martí i Franquès, 1, 08028 Barcelona,], Findlay, N. [Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth, PO1 3FX,] (ORCID:0009000707163477), Gil-Marín, H. [Departament de Física Quàntica i Astrofísica, Universitat de Barcelona, Martí i Franquès 1, E08028 Barcelona,; Institut d'Estudis Espacials de Catalunya (IEEC), c/ Esteve Terradas 1, Edifici RDIT, Campus PMT-UPC, 08860 Castelldefels,; Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (UB), c. Martí i Franquès, 1, 08028 Barcelona,] (ORCID:0000000302656217), Zarrouk, P. [Sorbonne Université, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), FR-75005 Paris,] (ORCID:0000000273059578), Nadathur, S. [Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth, PO1 3FX,] (ORCID:0000000190703102), Rocher, A. [Institute of Physics, Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, Chemin Pegasi 51, CH-1290 Versoix,; IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette,] (ORCID:0000000343496424), Brieden, S. [Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ,] (ORCID:0000000338969215), Pérez-Fernández, A. [Max Planck Institute for Extraterrestrial Physics, Gießenbachstraße 1, 85748 Garching,] (ORCID:0009000613314035), Aguilar, J. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,], Ahlen, S. [Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, MA 02215,] (ORCID:0000000160987247), Bianchi, D. [Dipartimento di Fisica “Aldo Pontremoli”, Università degli Studi di Milano, Via Celoria 16, I-20133 Milano,; INAF-Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano,] (ORCID:0000000197120006), Brooks, D. [Department of Physics & Astronomy, University College London, Gower Street, London, WC1E 6BT,], Castander, F.J. [Institut d'Estudis Espacials de Catalunya (IEEC), c/ Esteve Terradas 1, Edifici RDIT, Campus PMT-UPC, 08860 Castelldefels,; Institute of Space Sciences, ICE-CSIC, Campus UAB, Carrer de Can Magrans s/n, 08913 Bellaterra, Barcelona,] (ORCID:0000000173164573), Claybaugh, T. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,], Cuceu, A. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,] (ORCID:0000000221690595), de la Macorra, A. [Instituto de Física, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica, Ciudad Universitaria, Cd. de México C. P. 04510,] (ORCID:0000000217691640), de Mattia, A. [IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette,] (ORCID:0000000309202947), Dey, Arjun [NSF NOIRLab, 950 N. Cherry Ave., Tucson, AZ 85719,] (ORCID:0000000249284003), Doel, P. [Department of Physics & Astronomy, University College London, Gower Street, London, WC1E 6BT,], Font-Ribera, A. [Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Edifici Cn, Campus UAB, 08193, Bellaterra (Barcelona),] (ORCID:0000000230337312), Forero-Romero, J.E. [Departamento de Física, Universidad de los Andes, Cra. 1 No. 18A-10, Edificio Ip, CP 111711, Bogotá,; Observatorio Astronómico, Universidad de los Andes, Cra. 1 No. 18A-10, Edificio H, CP 111711 Bogotá,] (ORCID:0000000228903725), Gaztañaga, E. [Institut d'Estudis Espacials de Catalunya (IEEC), c/ Esteve Terradas 1, Edifici RDIT, Campus PMT-UPC, 08860 Castelldefels,; Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth, PO1 3FX,; Institute of Space Sciences, ICE-CSIC, Campus UAB, Carrer de Can Magrans s/n, 08913 Bellaterra, Barcelona,] (ORCID:0000000196320815), Gontcho, S.Gontcho A. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,; University of Virginia, Department of Astronomy, Charlottesville, VA 22904,] (ORCID:000000033142233X), Gutierrez, G. [Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510,], Guy, J. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,] (ORCID:0000000198226793), Hahn, C. [Steward Observatory, University of Arizona, 933 N. Cherry Avenue, Tucson, AZ 85721,] (ORCID:0000000311970902), Herrera-Alcantar, H.K. [Institut d'Astrophysique de Paris. 98 bis boulevard Arago. 75014 Paris,; IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette,] (ORCID:0000000291369609), Honscheid, K. [Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210,; Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210,; The Ohio State University, Columbus, 43210 OH,] (ORCID:0000000265502023), Howlett, C. [School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072,] (ORCID:0000000210819410), Huterer, D. [Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, MI 48109,; University of Michigan, 500 S. State Street, Ann Arbor, MI 48109,] (ORCID:0000000165580112), Ishak, M. [Department of Physics, The University of Texas at Dallas, 800 W. Campbell Rd., Richardson, TX 75080,] (ORCID:000000026024466X), Joyce, R. [NSF NOIRLab, 950 N. Cherry Ave., Tucson, AZ 85719,] (ORCID:0000000302015241), Kehoe, R. [Department of Physics, Southern Methodist University, 3215 Daniel Avenue, Dallas, TX 75275,], Kirkby, D. [Department of Physics and Astronomy, University of California, Irvine, CA 92697,] (ORCID:0000000288285463), Kisner, T. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,] (ORCID:0000000335107134), Kremin, A. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,] (ORCID:0000000163567424), Lahav, O. [Department of Physics & Astronomy, University College London, Gower Street, London, WC1E 6BT,], Lamman, C. [Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138,] (ORCID:0000000267319329), Landriau, M. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,] (ORCID:0000000318388528), Le Guillou, L. [Sorbonne Université, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), FR-75005 Paris,] (ORCID:0000000171788868), Levi, M.E. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,] (ORCID:0000000318871018), Magneville, C. [IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette,], Manera, M. [Departament de Física, Serra Húnter, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona),; Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Edifici Cn, Campus UAB, 08193, Bellaterra (Barcelona),] (ORCID:0000000349628934), Meisner, A. [NSF NOIRLab, 950 N. Cherry Ave., Tucson, AZ 85719,] (ORCID:0000000211257384), Miquel, R. [Institució Catalana de Recerca i Estudis Avançats, Passeig de Lluís Companys, 23, 08010 Barcelona,; Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Edifici Cn, Campus UAB, 08193, Bellaterra (Barcelona),], Moustakas, J. [Department of Physics and Astronomy, Siena College, 515 Loudon Road, Loudonville, NY 12211,] (ORCID:0000000227334559), Mueller, E. [Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH,], Palanque-Delabrouille, N. [IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette,; Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,] (ORCID:000000033188784X), Percival, W.J. [Department of Physics and Astronomy, University of Waterloo, 200 University Ave W, Waterloo, ON N2L 3G1,; Perimeter Institute for Theoretical Physics, 31 Caroline St. North, Waterloo, ON N2L 2Y5,; Waterloo Centre for Astrophysics, University of Waterloo, 200 University Ave W, Waterloo, ON N2L 3G1,] (ORCID:0000000206445727), Prada, F. [Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía, s/n, E-18008 Granada,] (ORCID:0000000171458674), Pérez-Ràfols, I. [Departament de Física, EEBE, Universitat Politècnica de Catalunya, c/Eduard Maristany 10, 08930 Barcelona,] (ORCID:0000000169790125), Rossi, G. [Department of Physics and Astronomy, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006,], Samushia, L. [Abastumani Astrophysical Observatory, Tbilisi, GE-0179,; Department of Physics, Kansas State University, 116 Cardwell Hall, Manhattan, KS 66506,; Faculty of Natural Sciences and Medicine, Ilia State University, 0194 Tbilisi,] (ORCID:0000000216095687), Sanchez, E. [CIEMAT, Avenida Complutense 40, E-28040 Madrid,] (ORCID:0000000296468198), Schlegel, D. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,], Schubnell, M. [Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, MI 48109,; University of Michigan, 500 S. State Street, Ann Arbor, MI 48109,], Seo, H. [Department of Physics & Astronomy, Ohio University, 139 University Terrace, Athens, OH 45701,] (ORCID:0000000265883508), Silber, J. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,] (ORCID:0000000234610320), Sprayberry, D. [NSF NOIRLab, 950 N. Cherry Ave., Tucson, AZ 85719,], Tarlé, G. [University of Michigan, 500 S. State Street, Ann Arbor, MI 48109,] (ORCID:0000000317040781), Weaver, B.A. [NSF NOIRLab, 950 N. Cherry Ave., Tucson, AZ 85719,], Zhao, C. [Department of Astronomy, Tsinghua University, 30 Shuangqing Road, Haidian District, Beijing, 100190,] (ORCID:0000000219917295), Zhou, R. [Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720,] (ORCID:0000000153814372), Zou, H. [National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing, 100101,] (ORCID:0000000266843997). 2026-06-03. Fiducial-cosmology-dependent systematics for the DESI 2024 full-shape analysis. https://doi.org/10.1088/1475-7516%2F2026%2F06%2F010
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