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KiDS-450: Testing extensions to the standard cosmological model

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posted on 2024-08-06, 11:04 authored by Shahab Joudaki, Alexander Mead, Chris BlakeChris Blake, Ami Choi, Jelte de Jong, Thomas Erben, Ian Fenech Conti, Ricardo Herbonnet, Catherine Heymans, Hendrik Hildebrandt, Henk Hoekstra, Benjamin Joachimi, Dominik Klaes, Fabian Köhlinger, Konrad Kuijken, John McFarland, Lance Miller, Peter Schneider, Massimo Viola
We test extensions to the standard cosmological model with weak gravitational lensing tomography using 450 deg 2 of imaging data from the Kilo Degree Survey (KiDS). In these extended cosmologies, which include massive neutrinos, non-zero curvature, evolving dark energy, modified gravity and running of the scalar spectral index, we also examine the discordance between KiDS and cosmic microwave background (CMB) measurements from Planck. The discordance between the two data sets is largely unaffected by a more conservative treatment of the lensing systematics and the removal of angular scales most sensitive to non-linear physics. The only extended cosmology that simultaneously alleviates the discordance with Planck and is at least moderately favoured by the data includes evolving dark energy with a time-dependent equation of state (in the form of the w 0 - w a parametrization). In this model, the respective constraints agree at the 1σ level, and there is 'substantial concordance' between the KiDS and Planck data sets when accounting for the full parameter space. Moreover, the Planck constraint on the Hubble constant is wider than in Λ cold dark matter (ΛCDM) and in agreement with the Riess et al. (2016) direct measurement of H 0 . The dark energy model is moderately favoured as compared to ΛCDM when combining the KiDS and Planck measurements, and marginalized constraints in the w 0 -w a plane are discrepant with a cosmological constant at the 3σ level. KiDS further constrains the sum of neutrino masses to 4.0 eV (95% CL), finds no preference for time or scale-dependent modifications to the metric potentials, and is consistent with flatness and no running of the spectral index.

Funding

CE110001020:ARC

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ISSN

1365-2966

Journal title

Monthly Notices of the Royal Astronomical Society

Volume

471

Issue

2

Pagination

20 pp

Publisher

Oxford University Press

Copyright statement

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Language

eng

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