@article{6ad833f951994ed893593bb85d5f9fd1,
title = "Measuring dark energy with expansion and growth",
abstract = "We combine cosmic chronometer and growth of structure data to derive the redshift evolution of the dark energy equation of state w, using a novel agnostic approach. The background and perturbation equations lead to two expressions for w, one purely background-based and the other relying also on the growth rate of large-scale structure. We compare the features and performance of the growth-based w to the background w, using Gaussian Processes for the reconstructions. We find that current data is not precise enough for robust reconstruction of the two forms of w. By using mock data expected from next-generation surveys, we show that the reconstructions will be robust enough and that the growth-based w will out-perform the background w. Furthermore, any disagreement between the two forms of w will provide a new test for deviations from the standard model of cosmology.",
keywords = "Cosmology, Dark energy, Gaussian processes, UKRI, STFC, ST/P000592/1",
author = "Louis Perenon and Matteo Martinelli and Roy Maartens and Stefano Camera and Chris Clarkson",
note = "Funding Information: We thank Sambatra Andrianomena, St{\'e}phane Ili{\'c} and Michelle Lochner for useful discussions. LP and RM are supported by the South African Radio Astronomy Observatory and the National Research Foundation (Grant No. 75415 ). MM acknowledges funding by the Agenzia Spaziale Italiana (ASI) under agreement no. 2018-23-HH.0 . SC acknowledges support from the Italian Ministry of Education, University and Research ( miur ) through the {\textquoteleft}Departments of Excellence 2018–2022{\textquoteright} Grant ( L. 232/2016 ) and from the Ministero degli Affari Esteri della Cooperazione Internazionale ( maeci ) – Direzione Generale per la Promozione del Sistema Paese Progetto di Grande Rilevanza ZA18GR02 . CC is supported by the United Kingdom Science & Technology Facilities Council , Consolidated Grant No. ST/P000592/1 . Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",
year = "2022",
month = sep,
day = "30",
doi = "10.1016/j.dark.2022.101119",
language = "English",
volume = "37",
journal = "Physics of the Dark Universe",
issn = "2212-6864",
publisher = "Elsevier",
}