Measurements of the growth rate of structures at z<0.1 with peculiar velocity surveys have the potential of testing the validity of general relativity on cosmic scales. In this work, we present growth-rate measurements from realistic simulated sets of type-Ia supernovae (SNe Ia) from the Zwicky Transient Facility (ZTF). We describe our simulation methodology, the light-curve fitting and peculiar velocity estimation. Using the maximum likelihood method, we derive constraints on fσ8 using only ZTF SN Ia peculiar velocities. We carefully tested the method and we quantified biases due to selection effects (photometric detection, spectroscopic follow-up for typing) on several independent realizations. We simulated the equivalent of 6 years of ZTF data, and considering an unbiased spectroscopically typed sample at z<0.06, we obtained unbiased estimates of fσ8 with an average uncertainty of 19% precision. We also investigated the information gain in applying bias correction methods. Our results validate our framework which can be used on real ZTF data.
@article{arxiv.2303.01198,
title = {Growth-rate measurement with type-Ia supernovae using ZTF survey simulations},
author = {Bastien Carreres and Julian E. Bautista and Fabrice Feinstein and Dominique Fouchez and Benjamin Racine and Mathew Smith and Mellissa Amenouche and Marie Aubert and Suhail Dhawan and Madeleine Ginolin and Ariel Goobar and Philippe Gris and Leander Lacroix and Eric Nuss and Nicolas Regnault and Mickael Rigault and Estelle Robert and Philippe Rosnet and Kelian Sommer and Richard Dekany and Steven L. Groom and Niharika Sravan and Frank J. Masci and Josiah Purdum},
journal= {arXiv preprint arXiv:2303.01198},
year = {2023}
}