KiDS-Legacy: Constraining dark energy, neutrino mass, and curvature

Robert Reischke; Benjamin Stölzner; Benjamin Joachimi; Angus H. Wright; Marika Asgari; Maciej Bilicki; Nora Elisa Chisari; Andrej Dvornik; Christos Georgiou; Benjamin Giblin; Joachim Harnois-Déraps; Catherine Heymans; Hendrik Hildebrandt; Henk Hoekstra; Shahab Joudaki; Konrad Kuijken; Shun-Sheng Li; Laila Linke; Arthur Loureiro; Constance Mahony; Lauro Moscardini; Lucas Porth; Mario Radovich; Tilman Tröster; Maximilian von Wietersheim-Kramsta; Ziang Yan; Mijin Yoon; Yun-Hao Zhang

Paper

KiDS-Legacy: Constraining dark energy, neutrino mass, and curvature

Abstract

We constrain minimally extended cosmological models with the cosmic shear analysis of the final data release from the Kilo-Degree Survey (KiDS-Legacy) in combination with external probes. Due to the consistency of the KiDS-Legacy analysis with the Cosmic Microwave Background (CMB), we can combine these data sets reliably for the first time. Additionally, we use CMB lensing, galaxy redshift-space distortions, and baryon acoustic oscillations. We assess, in turn, the effects of spatial curvature, varying neutrino masses, and an evolving dark energy component on cosmological constraints from KiDS-Legacy alone and in combination with external probes. We find KiDS-Legacy to be consistent with the fiducial flat

CDM analysis with

eV,

and

while

bounds) with almost equal goodness-of-fit.

CDM is not a significant improvement over

CDM when cosmic shear and CMB lensing are combined, yielding a Bayes factor

. If all probes are combined, however,

increases to 2.73, corresponding to a

suspicousness tension. The constraint on

is robust to opening up the parameter space for cosmic shear. Adding all external datasets to KiDS-Legacy, we find with

CDM and

CDM for all probes combined.