Field-level inference of growth rate from DESI BGS galaxy and ZTF supernova simulations
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 fσ8. 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 σfσ8 = +0.047−0.048 corresponding to a 10 \% error. These measurements will play a critical role for testing modified gravity theories.
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BibTeX
@misc{ravoux2026fieldlevel,
title = {{Field-level inference of growth rate from DESI BGS galaxy and ZTF supernova simulations}},
author = {Corentin Ravoux and Bastien Carreres and Julian Bautista and Damiano Rosselli and Jessica Aguilar and Steven Ahlen and Melissa Amenouche and Uendert Andrade and Eric Armengaud and Alejandro Aviles and Florian Beutler and Davide Bianchi and David Brooks and Umut Burgaz and Aurelio Carnero Rosell and Edmond Chaussidon and Todd Claybaugh and Andrei Cuceu and Axel de la Macorra and Georgios Dimitriadis and Andreu Font-Ribera and Daniel Felipe Forero Sánchez and Jaime E Forero-Romero and Enrique Gaztañaga and Satya Gontcho A. Gontcho and Ariel Goobar and Gaston Gutierrez and Hiram K Herrera-Alcantar and Cullan Howlett and Mustapha Ishak and Joel Johansson and Stephanie Juneau and Ofer Lahav and Martin Landriau and Laurent Le Guillou and Alexie Leauthaud and Marc Manera and Ramon Miquel and Seshadri Nadathur and Jakob Nordin and Hernan Enrique Noriega and Enrique Paillas and Nathalie Palanque-Delabrouille and Will Percival and Francisco Prada and Ignasi Pérez-Ràfols and Mickael Rigault and Antoine Rocher and Philippe Rosnet and Graziano Rossi and Rossana Ruggeri and Lado Samushia and Eusebio Sanchez and Christoph Saulder and David Schlegel and Michael Schubnell and Hee-Jong Seo and Joseph Silber and Małgorzata Siudek and Mathew Smith},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.34508},
eprint = {2609.34508},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05781876v1},
}
RIS
TY - UNPB
TI - Field-level inference of growth rate from DESI BGS galaxy and ZTF supernova simulations
AU - Corentin Ravoux
AU - Bastien Carreres
AU - Julian Bautista
AU - Damiano Rosselli
AU - Jessica Aguilar
AU - Steven Ahlen
AU - Melissa Amenouche
AU - Uendert Andrade
AU - Eric Armengaud
AU - Alejandro Aviles
AU - Florian Beutler
AU - Davide Bianchi
AU - David Brooks
AU - Umut Burgaz
AU - Aurelio Carnero Rosell
AU - Edmond Chaussidon
AU - Todd Claybaugh
AU - Andrei Cuceu
AU - Axel de la Macorra
AU - Georgios Dimitriadis
AU - Andreu Font-Ribera
AU - Daniel Felipe Forero Sánchez
AU - Jaime E Forero-Romero
AU - Enrique Gaztañaga
AU - Satya Gontcho A. Gontcho
AU - Ariel Goobar
AU - Gaston Gutierrez
AU - Hiram K Herrera-Alcantar
AU - Cullan Howlett
AU - Mustapha Ishak
AU - Joel Johansson
AU - Stephanie Juneau
AU - Ofer Lahav
AU - Martin Landriau
AU - Laurent Le Guillou
AU - Alexie Leauthaud
AU - Marc Manera
AU - Ramon Miquel
AU - Seshadri Nadathur
AU - Jakob Nordin
AU - Hernan Enrique Noriega
AU - Enrique Paillas
AU - Nathalie Palanque-Delabrouille
AU - Will Percival
AU - Francisco Prada
AU - Ignasi Pérez-Ràfols
AU - Mickael Rigault
AU - Antoine Rocher
AU - Philippe Rosnet
AU - Graziano Rossi
AU - Rossana Ruggeri
AU - Lado Samushia
AU - Eusebio Sanchez
AU - Christoph Saulder
AU - David Schlegel
AU - Michael Schubnell
AU - Hee-Jong Seo
AU - Joseph Silber
AU - Małgorzata Siudek
AU - Mathew Smith
PY - 2026
DA - 2026/09/28
PB - HAL
DO - 10.48550/arxiv.2609.34508
UR - https://hal.science/hal-05781876v1
AB - 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.
ER -