Dark Energy Survey internal consistency tests of the joint cosmological probes analysis with posterior predictive distributions

Abstract

Beyond-$\Lambda$CDM physics or systematic errors may cause subsets of a cosmological data set to appear inconsistent when analyzed assuming $\Lambda$CDM. 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 $\Lambda$CDM. We find that the DES Y1 data have an acceptable goodness of fit to $\Lambda$CDM, 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.

v2: Minor modification in calibration methodology; conclusions unchanged. v3: Matches version accepted in MNRAS; generalises calibration of p-values, while leaving qualitative conclusions unchanged. Comments are welcome

References in corpus (9)

• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• The trouble with $H_0$
• PolyChord: nested sampling for cosmology
• Lensing is Low: Cosmology, Galaxy Formation, or New Physics?
• Tension between the power spectrum of density perturbations measured on large and small scales
• KiDS+VIKING-450 and DES-Y1 combined: Mitigating baryon feedback uncertainty with COSEBIs
• Dark Energy Survey Year 1 Results: Multi-Probe Methodology and Simulated Likelihood Analyses
• On the insufficiency of arbitrarily precise covariance matrices: non-Gaussian weak lensing likelihoods
• The impact of signal-to-noise, redshift, and angular range on the bias of weak lensing 2-point functions

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