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Dark Energy Survey year 1 results: constraints on extended cosmological models from galaxy clustering and weak lensing

Dark Energy Survey year 1 results: constraints on extended cosmological models from galaxy clustering and weak lensing
Dark Energy Survey year 1 results: constraints on extended cosmological models from galaxy clustering and weak lensing

We present constraints on extensions of the minimal cosmological models dominated by dark matter and dark energy, ΛCDM and wCDM, by using a combined analysis of galaxy clustering and weak gravitational lensing from the first-year data of the Dark Energy Survey (DES Y1) in combination with external data. We consider four extensions of the minimal dark energy-dominated scenarios: (1) nonzero curvature ωk, (2) number of relativistic species Neff different from the standard value of 3.046, (3) time-varying equation-of-state of dark energy described by the parameters w0 and wa (alternatively quoted by the values at the pivot redshift, wp, and wa), and (4) modified gravity described by the parameters μ0 and ς0 that modify the metric potentials. We also consider external information from Planck cosmic microwave background measurements; baryon acoustic oscillation measurements from SDSS, 6dF, and BOSS; redshift-space distortion measurements from BOSS; and type Ia supernova information from the Pantheon compilation of datasets. Constraints on curvature and the number of relativistic species are dominated by the external data; when these are combined with DES Y1, we find ωk=0.0020-0.0032+0.0037 at the 68% confidence level, and the upper limit Neff<3.28(3.55) at 68% (95%) confidence, assuming a hard prior Neff>3.0. For the time-varying equation-of-state, we find the pivot value (wp,wa)=(-0.91-0.23+0.19,-0.57-1.11+0.93) at pivot redshift zp=0.27 from DES alone, and (wp,wa)=(-1.01-0.04+0.04,-0.28-0.48+0.37) at zp=0.20 from DES Y1 combined with external data; in either case we find no evidence for the temporal variation of the equation of state. For modified gravity, we find the present-day value of the relevant parameters to be ς0=0.43-0.29+0.28 from DES Y1 alone, and (ς0,μ0)=(0.06-0.07+0.08,-0.11-0.46+0.42) from DES Y1 combined with external data. These modified-gravity constraints are consistent with predictions from general relativity.

2470-0010
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DES Collaboration
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Zhang, Y.
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DES Collaboration (2019) Dark Energy Survey year 1 results: constraints on extended cosmological models from galaxy clustering and weak lensing. Physical Review D, 99 (12), [123505]. (doi:10.1103/PhysRevD.99.123505).

Record type: Article

Abstract

We present constraints on extensions of the minimal cosmological models dominated by dark matter and dark energy, ΛCDM and wCDM, by using a combined analysis of galaxy clustering and weak gravitational lensing from the first-year data of the Dark Energy Survey (DES Y1) in combination with external data. We consider four extensions of the minimal dark energy-dominated scenarios: (1) nonzero curvature ωk, (2) number of relativistic species Neff different from the standard value of 3.046, (3) time-varying equation-of-state of dark energy described by the parameters w0 and wa (alternatively quoted by the values at the pivot redshift, wp, and wa), and (4) modified gravity described by the parameters μ0 and ς0 that modify the metric potentials. We also consider external information from Planck cosmic microwave background measurements; baryon acoustic oscillation measurements from SDSS, 6dF, and BOSS; redshift-space distortion measurements from BOSS; and type Ia supernova information from the Pantheon compilation of datasets. Constraints on curvature and the number of relativistic species are dominated by the external data; when these are combined with DES Y1, we find ωk=0.0020-0.0032+0.0037 at the 68% confidence level, and the upper limit Neff<3.28(3.55) at 68% (95%) confidence, assuming a hard prior Neff>3.0. For the time-varying equation-of-state, we find the pivot value (wp,wa)=(-0.91-0.23+0.19,-0.57-1.11+0.93) at pivot redshift zp=0.27 from DES alone, and (wp,wa)=(-1.01-0.04+0.04,-0.28-0.48+0.37) at zp=0.20 from DES Y1 combined with external data; in either case we find no evidence for the temporal variation of the equation of state. For modified gravity, we find the present-day value of the relevant parameters to be ς0=0.43-0.29+0.28 from DES Y1 alone, and (ς0,μ0)=(0.06-0.07+0.08,-0.11-0.46+0.42) from DES Y1 combined with external data. These modified-gravity constraints are consistent with predictions from general relativity.

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Published date: 7 June 2019

Identifiers

Local EPrints ID: 434174
URI: http://eprints.soton.ac.uk/id/eprint/434174
ISSN: 2470-0010
PURE UUID: 598e7fcc-b311-4e2d-a9e8-e83aea845f3b
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432

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Date deposited: 13 Sep 2019 16:30
Last modified: 21 Jan 2021 17:32

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Contributors

Author: T. M.C. Abbott
Author: F. B. Abdalla
Author: S. Avila
Author: M. Banerji
Author: E. Baxter
Author: K. Bechtol
Author: M. R. Becker
Author: E. Bertin
Author: J. Blazek
Author: S. L. Bridle
Author: D. Brooks
Author: D. Brout
Author: D. L. Burke
Author: A. Campos
Author: A. Carnero Rosell
Author: M. Carrasco Kind
Author: J. Carretero
Author: F. J. Castander
Author: R. Cawthon
Author: C. Chang
Author: A. Chen
Author: M. Crocce
Author: C. E. Cunha
Author: L. N. Da Costa
Author: C. Davis
Author: J. De Vicente
Author: J. Derose
Author: S. Desai
Author: E. Di Valentino
Author: H. T. Diehl
Author: J. P. Dietrich
Author: S. Dodelson
Author: P. Doel
Author: A. Drlica-Wagner
Author: T. F. Eifler
Author: J. Elvin-Poole
Author: A. E. Evrard
Author: E. Fernandez
Author: A. Ferté
Author: M. W.G. Johnson
Author: M. W.G. Johnson
Author: S. Lee
Author: T. S. Li
Author: J. L. Marshall
Author: E. Sanchez
Author: M. Smith ORCID iD
Author: D. Thomas
Author: A. R. Walker
Author: Y. Zhang
Corporate Author: DES Collaboration

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