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Lookup NU author(s): Dr Danielle LeonardORCiD
© 2021 American Physical Society.We analyze Dark Energy Survey (DES) data to constrain a cosmological model where a subset of parameters - focusing on ωm - are split into versions associated with structure growth (e.g., ωmgrow) and expansion history (e.g., ωmgeo). Once the parameters have been specified for the ΛCDM cosmological model, which includes general relativity as a theory of gravity, it uniquely predicts the evolution of both geometry (distances) and the growth of structure over cosmic time. Any inconsistency between measurements of geometry and growth could therefore indicate a breakdown of that model. Our growth-geometry split approach therefore serves both as a (largely) model-independent test for beyond-ΛCDM physics, and as a means to characterize how DES observables provide cosmological information. We analyze the same multiprobe DES data as [Phys. Rev. Lett. 122, 171301 (2019)PRLTAO0031-900710.1103/PhysRevLett.122.171301]: DES Year 1 (Y1) galaxy clustering and weak lensing, which are sensitive to both growth and geometry, as well as Y1 BAO and Y3 supernovae, which probe geometry. We additionally include external geometric information from BOSS DR12 BAO and a compressed Planck 2015 likelihood, and external growth information from BOSS DR12 RSD. We find no significant disagreement with ωmgrow=ωmgeo. When DES and external data are analyzed separately, degeneracies with neutrino mass and intrinsic alignments limit our ability to measure ωmgrow, but combining DES with external data allows us to constrain both growth and geometric quantities. We also consider a parametrization where we split both ωm and w, but find that even our most constraining data combination is unable to separately constrain ωmgrow and wgrow. Relative to ΛCDM, splitting growth and geometry weakens bounds on σ8 but does not alter constraints on h.
Author(s): Muir J, Baxter E, Miranda V, Doux C, Ferte A, Leonard CD, Huterer D, Jain B, Lemos P, Raveri M, Nadathur S, Campos A, Chen A, Dodelson S, Elvin-Poole J, Lee S, Secco LF, Troxel MA, Weaverdyck N, Zuntz J, Brout D, Choi A, Crocce M, Davis TM, Gruen D, Krause E, Lidman C, Maccrann N, Moller A, Prat J, Ross AJ, Sako M, Samuroff S, Sanchez C, Scolnic D, Zhang B, Abbott TMC, Aguena M, Allam S, Annis J, Avila S, Bacon D, Bertin E, Bhargava S, Bridle SL, Brooks D, Burke DL, Carnero Rosell A, Carrasco Kind M, Carretero J, Cawthon R, Costanzi M, Da Costa LN, Pereira MES, Desai S, Diehl HT, Dietrich JP, Doel P, Estrada J, Everett S, Evrard AE, Ferrero I, Flaugher B, Frieman J, Garcia-Bellido J, Giannantonio T, Gruendl RA, Gschwend J, Gutierrez G, Hinton SR, Hollowood DL, Honscheid K, Hoyle B, James DJ, Jeltema T, Kuehn K, Kuropatkin N, Lahav O, Lima M, Maia MAG, Menanteau F, Miquel R, Morgan R, Myles J, Palmese A, Paz-Chinchon F, Plazas AA, Romer AK, Roodman A, Sanchez E, Scarpine V, Serrano S, Sevilla-Noarbe I, Smith M, Suchyta E, Swanson MEC, Tarle G, Thomas D, To C, Tucker DL, Varga TN, Weller J, Wilkinson RD
Publication type: Article
Publication status: Published
Journal: Physical Review D
Year: 2021
Volume: 103
Issue: 2
Print publication date: 15/01/2021
Online publication date: 21/01/2021
Acceptance date: 07/12/2020
Date deposited: 24/10/2023
ISSN (print): 2470-0010
ISSN (electronic): 2470-0029
Publisher: American Physical Society
URL: https://doi.org/10.1103/PhysRevD.103.023528
DOI: 10.1103/PhysRevD.103.023528
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