Efstathiou, G;
Lemos, P;
(2018)
Statistical inconsistencies in the KiDS-450 data set.
Monthly Notices of the Royal Astronomical Society
, 476
(1)
pp. 151-157.
10.1093/mnras/sty099.
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Abstract
The Kilo-Degree Survey (KiDS) has been used in several recent papers to infer constraints on the amplitude of the matter power spectrum and matter density at low redshift. Some of these analyses have claimed tension with the Planck Λ cold dark matter cosmology at the ∼2σ–3σ level, perhaps indicative of new physics. However, Planck is consistent with other low-redshift probes of the matter power spectrum such as redshift-space distortions and the combined galaxy-mass and galaxy–galaxy power spectra. Here, we perform consistency tests of the KiDS data, finding internal tensions for various cuts of the data at ∼2.2σ–3.5σ significance. Until these internal tensions are understood, we argue that it is premature to claim evidence for new physics from KiDS. We review the consistency between KiDS and other weak lensing measurements of S₈, highlighting the importance of intrinsic alignments for precision cosmology.
| Type: | Article |
|---|---|
| Title: | Statistical inconsistencies in the KiDS-450 data set |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/sty099 |
| Publisher version: | https://doi.org/10.1093/mnras/sty099 |
| 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: | cosmic background radiation, cosmological parameters, large-scale structure of Universe, 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-pp.ucl.ac.uk/id/eprint/10058591 |
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