The Dark Energy Survey Supernova Program: Investigating Beyond-$\Lambda$CDM
Abstract
We report constraints on a variety of non-standard cosmological models using the full 5-year photometrically-classified type Ia supernova sample from the Dark Energy Survey (DES-SN5YR). Both Akaike Information Criterion (AIC) and Suspiciousness calculations find no strong evidence for or against any of the non-standard models we explore. When combined with external probes, the AIC and Suspiciousness agree that 11 of the 15 models are moderately preferred over Flat-CDM suggesting additional flexibility in our cosmological models may be required beyond the cosmological constant. We also provide a detailed discussion of all cosmological assumptions that appear in the DES supernova cosmology analyses, evaluate their impact, and provide guidance on using the DES Hubble diagram to test non-standard models. An approximate cosmological model, used to perform bias corrections to the data holds the biggest potential for harbouring cosmological assumptions. We show that even if the approximate cosmological model is constructed with a matter density shifted by from the true matter density of a simulated data set the bias that arises is sub-dominant to statistical uncertainties. Nevertheless, we present and validate a methodology to reduce this bias.
Cite
@article{arxiv.2406.05048,
title = {The Dark Energy Survey Supernova Program: Investigating Beyond-$\Lambda$CDM},
author = {R. Camilleri and T. M. Davis and M. Vincenzi and P. Shah and J. Frieman and R. Kessler and P. Armstrong and D. Brout and A. Carr and R. Chen and L. Galbany and K. Glazebrook and S. R. Hinton and J. Lee and C. Lidman and A. Möller and B. Popovic and H. Qu and M. Sako and D. Scolnic and M. Smith and M. Sullivan and B. O. Sánchez and G. Taylor and M. Toy and P. Wiseman and T. M. C. Abbott and M. Aguena and S. Allam and O. Alves and J. Annis and S. Avila and D. Bacon and E. Bertin and S. Bocquet and D. Brooks and D. L. Burke and A. Carnero Rosell and J. Carretero and F. J. Castander and L. N. da Costa and M. E. S. Pereira and S. Desai and H. T. Diehl and P. Doel and C. Doux and S. Everett and I. Ferrero and B. Flaugher and P. Fosalba and J. García-Bellido and M. Gatti and E. Gaztanaga and G. Giannini and D. Gruen and D. L. Hollowood and K. Honscheid and D. J. James and K. Kuehn and O. Lahav and S. Lee and J. L. Marshall and J. Mena-Fernández and R. Miquel and J. Muir and J. Myles and R. L. C. Ogando and A. Pieres and A. A. Plazas Malagón and A. Porredon and M. Rodriguez-Monroy and E. Sanchez and D. Sanchez Cid and M. Schubnell and I. Sevilla-Noarbe and E. Suchyta and M. E. C. Swanson and G. Tarle and A. R. Walker and N. Weaverdyck},
journal= {arXiv preprint arXiv:2406.05048},
year = {2024}
}
Comments
Published to MNRAS on 20 August 2024; v2 updates to the accepted version