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

Doux, C.; Baxter, E.; Lemos, P.; Chang, C.; Alarcon, A.; Amon, A.; Campos, A.; Choi, A.; Gatti, M.; Gruen, D.; Jarvis, M.; MacCrann, N.; Park, Y.; Prat, J.; Rau, M. M.; Raveri, M.; Samuroff, S.; DeRose, J.; Hartley, W. G.; Hoyle, B.; Troxel, M. A.; Zuntz, J.; Abbott, T. M. C.; Aguena, M.; Allam, S.; Annis, J.; Avila, S.; Bacon, D.; Bertin, E.; Bhargava, S.; Brooks, D.; Burke, D. L.; Kind, M. Carrasco; Carretero, J.; Cawthon, R.; Costanzi, M.; da Costa, L. N.; Pereira, M. E. S.; Desai, S.; Diehl, H. T.; Dietrich, J. P.; Doel, P.; Everett, S.; Ferrero, I.; Fosalba, P.; Frieman, J.; Garcıa-Bellido, J.; Gerdes, D. W.; Giannantonio, T.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Hinton, S. R.; Hollowood, D. L.; Honscheid, K.; Huff, E. M.; Huterer, D.; Jain, B.; James, D. J.; Krause, E.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Lidman, C.; Lima, M.; Maia, M. A. G.; Menanteau, F.; Miquel, R.; Morgan, R.; Muir, J.; Ogando, R. L. C.; Palmese, A.; Paz-Chinchon, F.; Plazas, A. A.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Serrano, S.; Sevilla-Noarbe, I.; Smith, M.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; To, C.; Tucker, D. L.; Varga, T. N.; Weller, J.; Wilkinson, R. D.

doi:10.1093/mnras/stab526

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

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Hoyle, B.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Varga, T. N.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Weller, J.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Doux, C., Baxter, E., Lemos, P., Chang, C., Alarcon, A., Amon, A., et al. (2021). Dark energy survey internal consistency tests of the joint cosmological probes analysis with posterior predictive distributions. Monthly Notices of the Royal Astronomical Society, 503(2), 2688-2705. doi:10.1093/mnras/stab526.

Cite as: https://hdl.handle.net/21.11116/0000-0009-2365-E

Abstract

Beyond ΛCDM, physics or systematic errors may cause subsets of a cosmological data set to appear inconsistent when analysed 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 per cent) 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.