Matter power spectrum reconstruction with KiDS-Legacy: Improved internal ΛCDM consistency and preference for strong baryonic feedback
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.
Authors
- Shangrong Li (ORCID: https://orcid.org/0000-0001-9952-7408)
- M. Maturi (ORCID: https://orcid.org/0000-0002-3517-2422)
- Angus H. Wright (ORCID: https://orcid.org/0000-0001-7363-7932)
- M. Radovich (ORCID: https://orcid.org/0000-0002-3585-866X)
- L. Moscardini (ORCID: https://orcid.org/0000-0002-3473-6716)
- Maciej Bilicki (ORCID: https://orcid.org/0000-0002-3910-5809)
- H. Hildebrandt (ORCID: https://orcid.org/0000-0002-9814-3338)
- Henk Hoekstra (ORCID: https://orcid.org/0000-0002-0641-3231)
- Maximilian von Wietersheim-Kramsta (ORCID: https://orcid.org/0000-0003-4986-5091)
- Konrad H. Kuijken (ORCID: https://orcid.org/0000-0002-3827-0175)
- Robert Reischke (ORCID: https://orcid.org/0000-0001-5404-8753)
- Lucas Porth (ORCID: https://orcid.org/0000-0003-1176-6346)
- Marika Asgari (ORCID: https://orcid.org/0000-0002-3064-083X)
- P. Šimon (ORCID: https://orcid.org/0000-0001-9106-9975)
- Jeger C. Broxterman (ORCID: https://orcid.org/0000-0002-8155-5977)
- Benjamin Joachimi
- Catherine Heymans
Institutions
- Leiden University (NL)
- University of Bonn (DE)
- Istituto Nazionale di Fisica Nucleare (IT)
- Heidelberg University (DE)
- Center for Theoretical Physics (PL)
- Royal Observatory (GB)
- Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano (IT)
- Instituto de Física Teórica (ES)
- Astronomical Institute of the Slovak Academy of Sciences (SK)
- Computational Physics (United States) (US)
- Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT)
- Centre for Policy Studies (IN)
- Osservatorio Astronomico di Padova (IT)
- University College London (GB)
- Newcastle University (GB)
- National Institute for Astrophysics (IT)
- University of Bologna (IT)
- University of Edinburgh (GB)
- Polish Academy of Sciences (PL)
Publication Details
- Journal
- Astronomy and Astrophysics
- Published
- 2025-10-09
- DOI
- https://doi.org/10.1051/0004-6361/202557182
- Citations
- 1
- Primary Topic
- Quantum Chromodynamics and Particle Interactions
- Type
- article
- Field-Weighted Citation Impact
- 1.87