Year: 2026
Type: preprint
Abstract: Galaxy peculiar velocities are a powerful probe of the growth rate of structure $f$ at low redshifts ($z < 0.2$), measured through the combination $fσ_8$. These constraints are improved by combining peculiar velocities with redshift space distortion measurements from the galaxy density field. We create a dedicated simulation to test growth rate measurement from the combination of Type Ia supernova peculiar velocities from the Zwicky Transient Facility (ZTF) with the Bright Galaxy Survey (BGS) of the Dark Energy Spectroscopic Instrument (DESI), using projections for 6 years of ZTF data and the Data Release 3 (DR3) of DESI. We apply a wide-angle likelihood-based field-level inference to combine ZTF velocity and DESI BGS density fields simultaneously. This procedure is performed while varying the different density and velocity field configurations. Adding DESI galaxy density information to the ZTF supernovae improves the constraint on nuisance parameters and yields up to a 50 \% reduction in the growth-rate uncertainty without introducing bias. If we consider the conservatively best DESI density configuration, the mean error bar achievable by a DESI ZTF measurement is $σ_{fσ_8} = {}^{+0.047}_{-0.048}$ corresponding to a 10 \% error. These measurements will play a critical role for testing modified gravity theories.
Source: arXiv (Cornell University)
Authors: Ravoux, Corentin, Carreres, Bastien, Bautista, Julian, Rosselli, Damiano, Aguilar, Jessica, Ahlen, Steven, Amenouche, Melissa, Andrade, Uendert, Armengaud, Eric, Aviles, Alejandro, Beutler, Florian, Bianchi, Davide, Brooks, David, Burgaz, Umut, Rosell, Aurelio Carnero, Chaussidon, Edmond, Claybaugh, Todd, Cuceu, Andrei, de la Macorra, Axel, Dimitriadis, Georgios, Font-Ribera, Andreu, Sánchez, Daniel Felipe Forero, Forero-Romero, Jaime E., Gaztañaga, Enrique, Gontcho, Satya Gontcho A, Goobar, Ariel, Gutierrez, Gaston, Herrera-Alcantar, Hiram K., Howlett, Cullan, Ishak, Mustapha, Johansson, Joel, Juneau, Stephanie, Lahav, Ofer, Landriau, Martin, Guillou, Laurent Le, Leauthaud, Alexie, Manera, Marc, Miquel, Ramon, Nadathur, Seshadri, Nordin, Jakob, Noriega, Hernan Enrique, Paillas, Enrique, Palanque-Delabrouille, Nathalie, Percival, Will, Prada, Francisco, Pérez-Ràfols, Ignasi, Rigault, Mickael, Rocher, Antoine, Rosnet, Philippe, Rossi, Graziano, Ruggeri, Rossana, Samushia, Lado, Sanchez, Eusebio, Saulder, Christoph, Schlegel, David, Schubnell, Michael, Seo, Hee-Jong, Silber, Joseph, Siudek, Małgorzata, Smith, Mathew, Tarlé, Gregory, Weaver, Benjamin A., Zarrouk, Pauline
Institutions: Centre National de la Recherche Scientifique, Université Clermont Auvergne, Laboratoire de Physique de Clermont Auvergne, University of Milan, Aix-Marseille Université, Centre de physique des particules de Marseille, Institut National de Physique Nucléaire et de Physique des Particules, Lawrence Berkeley National Laboratory, Boston University, University of Liège, University of Michigan, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, CEA Paris-Saclay - Etablissement de Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, Universidad de La Laguna, Universidad Nacional Autónoma de México, Instituto de Astrofísica de Canarias, Universitat Autònoma de Barcelona, University of Arizona, University of California, Santa Cruz, University of California System, Sorbonne Université, Laboratoire de Physique Nucléaire et de Hautes Énergies, Barcelona Institute of Science and Technology, Institut de Ciències del Cosmos, Institució Catalana de Recerca i Estudis Avançats, Institute for High Energy Physics, Universitat de Barcelona, Universidad de Los Andes, Universitat Politècnica de Catalunya, Institut d'Estudis Espacials de Catalunya, University of Portsmouth, AlbaNova, Institute of Space Sciences, Institut d'Astrophysique de Paris, NSF NOIRLab
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, Gordon and Betty Moore Foundation, California Institute of Technology, Northwestern University, Aix-Marseille Université, University of Washington, Ministerio de Ciencia, Innovación y Universidades, University of Warwick, Trinity College Dublin, Weizmann Institute of Science, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Stockholms Universitet, Office of Science, Science and Technology Facilities Council, Deutsches Elektronen-Synchrotron, Agencia Estatal de Investigación, Institut National de Physique Nucléaire et de Physique des Particules, Division of Astronomical Sciences
Awards: G1044631029, G1105844351, G1286236842, G1813527838, G1863003419, G2256092659, Exploring & Exploiting the Dynamic Optical Sky, G2994122026, G3452655474, ZWICKY TRANSIENT FACILITY, G3880645893, G419881185, G42916606, G4501827968, G491712853, G498139845, G5635532810, G593054264, G6652958823, G6876926712, Management and Operations of the National Optical Astronomy Observatory, G7395345766, G7805626310, G7863371703, G8497050386, G8667377315
OpenAlex ID: W7214720772