Lemos, P;
Raveri, M;
Campos, A;
Park, Y;
Chang, C;
Weaverdyck, N;
Huterer, D;
... Suchyta, E; + view all
(2021)
Assessing tension metrics with dark energy survey and Planck data.
Monthly Notices of the Royal Astronomical Society
, 505
(4)
pp. 6179-6194.
10.1093/mnras/stab1670.
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Abstract
Quantifying tensions – inconsistencies amongst measurements of cosmological parameters by different experiments – has emerged as a crucial part of modern cosmological data analysis. Statistically significant tensions between two experiments or cosmological probes may indicate new physics extending beyond the standard cosmological model and need to be promptly identified. We apply several tension estimators proposed in the literature to the dark energy survey (DES) large-scale structure measurement and Planck cosmic microwave background data. We first evaluate the responsiveness of these metrics to an input tension artificially introduced between the two, using synthetic DES data. We then apply the metrics to the comparison of Planck and actual DES Year 1 data. We find that the parameter differences, Eigentension, and Suspiciousness metrics all yield similar results on both simulated and real data, while the Bayes ratio is inconsistent with the rest due to its dependence on the prior volume. Using these metrics, we calculate the tension between DES Year 1 3 × 2pt and Planck, finding the surveys to be in ∼2.3σ tension under the ΔCDM paradigm. This suite of metrics provides a toolset for robustly testing tensions in the DES Year 3 data and beyond.
| Type: | Article |
|---|---|
| Title: | Assessing tension metrics with dark energy survey and Planck data |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stab1670 |
| Publisher version: | https://doi.org/10.1093/mnras/stab1670 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | methods: statistical, cosmological parameters, cosmology: observations |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10133472 |
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