KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear

Joudaki, Shahab; Hildebrandt, Hendrik; Traykova, Dina; Chisari, Nora Elisa; Heymans, Catherine; Kannawadi, Arun; Kuijken, Konrad; Wright, Angus H.; Asgari, Marika; Erben, T.; Hoekstra, Henk; Joachimi, Benjamin; Miller, L.; Tröster, Tilman; Busch, Jan Luca van den

doi:10.1051/0004-6361/201936154

Cited by 203 publications

(268 citation statements)

References 51 publications

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“…In this way, shape noise affects all slices similarly, which allows us to fairly compare the signal from different redshift bins. All redshifts are assumed to be perfectly known in this article as we do not intend to assess the impact of photometric redshift uncertainties (e.g., Euclid Collaboration 2020) or biases in the mean of the redshift distribution (e.g., Joudaki et al 2020).…”

Section: Tomographymentioning

confidence: 99%

“…This particular combination of the matter density Ω m and clustering amplitude σ 8 runs across the main degeneracy direction obtained from cosmic shear constraints. It has notably been used to assess the potential tension between KiDS γ-2PCF cosmic shear and Planck CMB analyses (e.g., Hildebrandt et al 2017;Planck Collaboration VI 2020;Joudaki et al 2020;Heymans et al 2021). In this article, we generalize the peak formalism to aperture-mass statistics, which provides additional constraining power on S 8 .…”

Section: Introductionmentioning

confidence: 99%

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Probing dark energy with tomographic weak-lensing aperture mass statistics

Martinet

Harnois-Déraps

Jullo

et al. 2021

A&A

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We forecast and optimize the cosmological power of various weak-lensing aperture mass (Map) map statistics for future cosmic shear surveys, including peaks, voids, and the full distribution of pixels (1D Map). These alternative methods probe the non-Gaussian regime of the matter distribution, adding complementary cosmological information to the classical two-point estimators. Based on the SLICS and cosmo-SLICS N-body simulations, we build Euclid-like mocks to explore the S8 − Ωm − w0 parameter space. We develop a new tomographic formalism that exploits the cross-information between redshift slices (cross-Map) in addition to the information from individual slices (auto-Map) probed in the standard approach. Our auto-Map forecast precision is in good agreement with the recent literature on weak-lensing peak statistics and is improved by ∼50% when including cross-Map. It is further boosted by the use of 1D Map that outperforms all other estimators, including the shear two-point correlation function (γ-2PCF). When considering all tomographic terms, our uncertainty range on the structure growth parameter S8 is enhanced by ∼45% (almost twice better) when combining 1D Map and the γ-2PCF compared to the γ-2PCF alone. We additionally measure the first combined forecasts on the dark energy equation of state w0, finding a factor of three reduction in the statistical error compared to the γ-2PCF alone. This demonstrates that the complementary cosmological information explored by non-Gaussian Map map statistics not only offers the potential to improve the constraints on the recent σ8–Ωm tension, but also constitutes an avenue to understanding the accelerated expansion of our Universe.

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Section: Tomographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Probing dark energy with tomographic weak-lensing aperture mass statistics

Martinet

Harnois-Déraps

Jullo

et al. 2021

A&A

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show abstract

“…For instance, the value of 2016; Feeney et al 2018;Aylor et al 2019). Similarly, the value of 8 inferred from the cosmic microwave background and from large-scale structure, in particular weak lensing measurements, are discrepant at roughly the 3 level (e.g Battye et al 2015;MacCrann et al 2015;Raveri 2016;Hildebrandt et al 2017;DES Collaboration 2018;Raveri & Hu 2019;Asgari et al 2020;Joudaki et al 2020;Heymans et al 2020;Park & Rozo 2020). These tensions could be indicative either of a breakdown in the standard cosmological model, or of systematics impacting various analyses.…”

Section: Introductionmentioning

confidence: 99%

Dark energy survey internal consistency tests of the joint cosmological probes analysis with posterior predictive distributions

Doux¹,

Baxter²,

Lemos³

et al. 2021

Monthly Notices of the Royal Astronomical Society

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Beyond-ΛCDM physics or systematic errors may cause subsets of a cosmological data set to appear inconsistent when analyzed assuming ΛCDM. We present an application of internal consistency tests to measurements from the Dark Energy Survey Year 1 (DES Y1) joint probes analysis. Our analysis relies on computing the posterior predictive distribution (PPD) for these data under the assumption of ΛCDM. We find that the DES Y1 data have an acceptable goodness of fit to ΛCDM, with a probability of finding a worse fit by random chance of p = 0.046. Using numerical PPD tests, supplemented by graphical checks, we show that most of the data vector appears completely consistent with expectations, although we observe a small tension between large- and small-scale measurements. A small part (roughly 1.5%) of the data vector shows an unusually large departure from expectations; excluding this part of the data has negligible impact on cosmological constraints, but does significantly improve the p-value to 0.10. The methodology developed here will be applied to test the consistency of DES Year 3 joint probes data sets.

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“…Model 3 has Ω m h 2 = 0.167 and corresponds to the overlap region between the θ (3) line and the BAO and SH0ES bands in Figure 1. 14,15,15,19,24,25,[29][30][31]33 , along with the 68% CL bands from BAO 39 , SH0ES, DES 34 and the combination of DES with KiDS (KV450) 40 .…”

mentioning

confidence: 99%

Why reducing the cosmic sound horizon can not fully resolve the Hubble tension

Jedamzik

Pogosian

Zhao

2020

Preprint

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The mismatch between the locally measured expansion rate of the universe and the one inferred from the cosmic microwave background measurements by Planck in the context of the standard ΛCDM, known as the Hubble tension, has become one of the most pressing problems in cosmology. A large number of amendments to the ΛCDM model have been proposed in order to solve this tension. Many of them introduce new physics, such as early dark energy, modifications of the standard model neutrino sector, extra radiation, primordial magnetic fields or varying fundamental constants, with the aim of reducing the sound horizon at recombination r*. We demonstrate here that any model which only reduces r* can never fully resolve the Hubble tension while remaining consistent with other cosmological datasets. We show explicitly that models which operate at lower matter density Ωmh2 run into tension with the observations of baryon acoustic oscillations, while models operating at higher Ωmh2 develop tension with galaxy weak lensing data.

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KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear

Cited by 203 publications

References 51 publications

Probing dark energy with tomographic weak-lensing aperture mass statistics

Probing dark energy with tomographic weak-lensing aperture mass statistics

Dark energy survey internal consistency tests of the joint cosmological probes analysis with posterior predictive distributions

Why reducing the cosmic sound horizon can not fully resolve the Hubble tension

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