Matter power spectrum reconstruction with KiDS-Legacy: Improved internal $Λ$CDM consistency and preference for strong baryonic feedback
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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915596335054848 |
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| author | Broxterman, Jeger C. Simon, Patrick Porth, Lucas Kuijken, Konrad Wright, Angus H. Asgari, Marika Bilicki, Maciej Heymans, Catherine Hildebrandt, Hendrik Hoekstra, Henk Joachimi, Benjamin Li, Shun-Sheng Maturi, Matteo Moscardini, Lauro Radovich, Mario Reischke, Robert Von Wietersheim-Kramsta, Maximilian |
| author_facet | Broxterman, Jeger C. Simon, Patrick Porth, Lucas Kuijken, Konrad Wright, Angus H. Asgari, Marika Bilicki, Maciej Heymans, Catherine Hildebrandt, Hendrik Hoekstra, Henk Joachimi, Benjamin Li, Shun-Sheng Maturi, Matteo Moscardini, Lauro Radovich, Mario Reischke, Robert Von Wietersheim-Kramsta, Maximilian |
| contents | Direct measurements of the matter power spectrum, $P_\mathrm{m}(k,z)$, provide a powerful tool to investigate observed tensions between models of structure growth while also testing the internal consistency of cosmological probes. We analyse cosmic shear data from the final data release of the Kilo-Degree Survey (KiDS), presenting a deprojected $P_\mathrm{m}(k,z)$, measured in up to three redshift bins. Compared to analyses using previous KiDS releases, we find improved internal consistency in the $z\lesssim0.7$ regime. At large scales, $k\lesssim0.1\,h\,\rm Mpc^{-1}$, our power spectrum reconstruction aligns with $Λ$CDM predictions with a density fluctuation amplitude $σ_8=0.81$. Furthermore, at small scales, $k=3$-$20\,h\,\rm Mpc^{-1}$, the average matter power spectrum is suppressed by $30\%\pm10\%\,{\rm (stat.)}\pm4\%\,{\rm (sys.)}$ with $2.8σ$ significance relative to a dark-matter-only model, consistent with expectations of strong baryonic feedback. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_08365 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Matter power spectrum reconstruction with KiDS-Legacy: Improved internal $Λ$CDM consistency and preference for strong baryonic feedback Broxterman, Jeger C. Simon, Patrick Porth, Lucas Kuijken, Konrad Wright, Angus H. Asgari, Marika Bilicki, Maciej Heymans, Catherine Hildebrandt, Hendrik Hoekstra, Henk Joachimi, Benjamin Li, Shun-Sheng Maturi, Matteo Moscardini, Lauro Radovich, Mario Reischke, Robert Von Wietersheim-Kramsta, Maximilian Cosmology and Nongalactic Astrophysics Direct measurements of the matter power spectrum, $P_\mathrm{m}(k,z)$, provide a powerful tool to investigate observed tensions between models of structure growth while also testing the internal consistency of cosmological probes. We analyse cosmic shear data from the final data release of the Kilo-Degree Survey (KiDS), presenting a deprojected $P_\mathrm{m}(k,z)$, measured in up to three redshift bins. Compared to analyses using previous KiDS releases, we find improved internal consistency in the $z\lesssim0.7$ regime. At large scales, $k\lesssim0.1\,h\,\rm Mpc^{-1}$, our power spectrum reconstruction aligns with $Λ$CDM predictions with a density fluctuation amplitude $σ_8=0.81$. Furthermore, at small scales, $k=3$-$20\,h\,\rm Mpc^{-1}$, the average matter power spectrum is suppressed by $30\%\pm10\%\,{\rm (stat.)}\pm4\%\,{\rm (sys.)}$ with $2.8σ$ significance relative to a dark-matter-only model, consistent with expectations of strong baryonic feedback. |
| title | Matter power spectrum reconstruction with KiDS-Legacy: Improved internal $Λ$CDM consistency and preference for strong baryonic feedback |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2509.08365 |