Matter power spectrum reconstruction with KiDS-Legacy: Improved internal ΛCDM consistency and preference for strong baryonic feedback
Year: 2025
Type: article
Abstract: Direct measurements of the matter power spectrum, P m ( k , z ), provide a powerful tool for investigating the observed tensions between models of structure growth, while also testing the internal consistency of cosmological probes. We analysed the cosmic shear data from the final data release of the Kilo-Degree Survey (KiDS), and present a deprojected P m ( k , z ), measured in up to three redshift bins. Compared to analyses using previous KiDS releases, we find improved internal consistency in the z ≲ 0.7 regime. At large scales, k ≲ 0.1 h Mpc −1 , our power spectrum reconstruction aligns with ΛCDM predictions with a density fluctuation amplitude σ 8 = 0.81. Furthermore, at small scales, k = 3–20 h Mpc −1 , the average matter power spectrum is suppressed by 30%±10% (stat.) ± 4% (sys.) with 2.8 σ significance relative to a dark matter-only model, consistent with expectations of strong baryonic feedback.
Source: Astronomy and Astrophysics
Authors: Jeger C. Broxterman, Patrick Simon, Lucas Porth, Konrad Kuijken, Angus H. Wright, Marika Asgari, Maciej Bilicki, Catherine Heymans, Hendrik Hildebrandt, Henk Hoekstra, Benjamin Joachimi, Shun-Sheng Li, Matteo Maturi, Lauro Moscardini, Mario Radovich, Robert Reischke, Maximilian Von Wietersheim-Kramsta
Institutions: Leiden University, Leiden Observatory, University of Bonn, Ruhr University Bochum, Newcastle University, Center for Theoretical Physics, Polish Academy of Sciences, Royal Observatory, University of Edinburgh, University College London, Heidelberg University, Istituto Nazionale di Fisica Nucleare, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Osservatorio di Astrofisica e Scienza dello Spazio, National Institute for Astrophysics, University of Bologna, Osservatorio Astronomico di Padova, Durham University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
OpenAlex ID: W4415008715