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The dark energy survey supernova program: investigating beyond-ΛCDM

The dark energy survey supernova program: investigating beyond-ΛCDM
The dark energy survey supernova program: investigating beyond-ΛCDM

We report constraints on a variety of non-standard cosmological models using the full 5-yr 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-ΛCDM 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 ΔΩ m ∼ 0.2 from the true matter density of a simulated data set the bias that arises is subdominant to statistical uncertainties. Nevertheless, we present and validate a methodology to reduce this bias.

astro-ph.CO, surveys, cosmology: observations, supernovae: general, cosmological parameters
1365-2966
2615-2639
Camilleri, R.
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Davis, T.M.
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Vincenzi, M.
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Shah, P.
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Frieman, J.
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Kessler, R.
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Armstrong, P.
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Lee, J.
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Bacon, D.
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Bertin, E.
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Bocquet, S.
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Brooks, D.
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Rosell, A. Carnero
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Carretero, J.
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Castander, F.J.
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Costa, L.N. da
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Pereira, M.E.S.
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Desai, S.
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Doel, P.
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Doux, C.
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Everett, S.
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Flaugher, B.
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et al.
Camilleri, R.
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Davis, T.M.
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Vincenzi, M.
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Shah, P.
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Frieman, J.
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Kessler, R.
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Armstrong, P.
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Lee, J.
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Lidman, C.
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Möller, A.
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Popovic, B.
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Qu, H.
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Sako, M.
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Smith, M.
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Sullivan, M.
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Toy, M.
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Wiseman, P.
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Abbott, T.M.C.
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Aguena, M.
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Allam, S.
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Alves, O.
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Annis, J.
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Avila, S.
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Bacon, D.
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Brooks, D.
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Rosell, A. Carnero
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Carretero, J.
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Castander, F.J.
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Costa, L.N. da
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Pereira, M.E.S.
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Desai, S.
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Doel, P.
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Doux, C.
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Everett, S.
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Ferrero, I.
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Flaugher, B.
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Fosalba, P.
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Camilleri, R., Davis, T.M. and Vincenzi, M. , et al. (2024) The dark energy survey supernova program: investigating beyond-ΛCDM. Monthly Notices of the Royal Astronomical Society, 533 (3), 2615-2639. (doi:10.1093/mnras/stae1988).

Record type: Article

Abstract

We report constraints on a variety of non-standard cosmological models using the full 5-yr 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-ΛCDM 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 ΔΩ m ∼ 0.2 from the true matter density of a simulated data set the bias that arises is subdominant to statistical uncertainties. Nevertheless, we present and validate a methodology to reduce this bias.

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Available under License Creative Commons Attribution.
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More information

Accepted/In Press date: 13 August 2024
e-pub ahead of print date: 20 August 2024
Published date: 29 August 2024
Keywords: astro-ph.CO, surveys, cosmology: observations, supernovae: general, cosmological parameters

Identifiers

Local EPrints ID: 496294
URI: http://eprints.soton.ac.uk/id/eprint/496294
ISSN: 1365-2966
PURE UUID: 9c4f5204-2a69-4dab-8625-53288a0b2f12
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820
ORCID for P. Wiseman: ORCID iD orcid.org/0000-0002-3073-1512

Catalogue record

Date deposited: 11 Dec 2024 17:31
Last modified: 22 Aug 2025 02:21

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Contributors

Author: R. Camilleri
Author: T.M. Davis
Author: M. Vincenzi
Author: P. Shah
Author: J. Frieman
Author: R. Kessler
Author: P. Armstrong
Author: D. Brout
Author: A. Carr
Author: R. Chen
Author: L. Galbany
Author: K. Glazebrook
Author: S.R. Hinton
Author: J. Lee
Author: C. Lidman
Author: A. Möller
Author: B. Popovic
Author: H. Qu
Author: M. Sako
Author: D. Scolnic
Author: M. Smith
Author: M. Sullivan ORCID iD
Author: B.O. Sánchez
Author: G. Taylor
Author: M. Toy
Author: P. Wiseman ORCID iD
Author: T.M.C. Abbott
Author: M. Aguena
Author: S. Allam
Author: O. Alves
Author: J. Annis
Author: S. Avila
Author: D. Bacon
Author: E. Bertin
Author: S. Bocquet
Author: D. Brooks
Author: D.L. Burke
Author: A. Carnero Rosell
Author: J. Carretero
Author: F.J. Castander
Author: L.N. da Costa
Author: M.E.S. Pereira
Author: S. Desai
Author: H.T. Diehl
Author: P. Doel
Author: C. Doux
Author: S. Everett
Author: I. Ferrero
Author: B. Flaugher
Author: P. Fosalba
Corporate Author: et al.

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