Broxterman, Jeger C;
Simon, Patrick;
Porth, Lucas;
Kuijken, Konrad;
Wright, Angus H;
Asgari, Marika;
Bilicki, Maciej;
... Von Wietersheim-Kramsta, Maximilian; + view all
(2025)
Matter power spectrum reconstruction with KiDS-Legacy: Improved internal ΛCDM consistency and preference for strong baryonic feedback.
Astronomy & Astrophysics
, 703
, Article L3. 10.1051/0004-6361/202557182.
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Abstract
Direct measurements of the matter power spectrum, Pm(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 Pm(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 σ8 = 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 2.8σ significance relative to a dark matter-only model, consistent with expectations of strong baryonic feedback.
| Type: | Article |
|---|---|
| Title: | Matter power spectrum reconstruction with KiDS-Legacy: Improved internal ΛCDM consistency and preference for strong baryonic feedback |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/202557182 |
| Publisher version: | https://doi.org/10.1051/0004-6361/202557182 |
| Language: | English |
| Additional information: | © The Authors 2025. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). |
| Keywords: | gravitational lensing: weak, cosmology: observations, large-scale structure of Universe |
| 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.ucl.ac.uk/id/eprint/10217025 |
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