KiDS-Legacy: Constraining dark energy, neutrino mass, and curvature
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Reischke, Robert Stölzner, Benjamin Joachimi, Benjamin Wright, Angus H. Asgari, Marika Bilicki, Maciej Chisari, Nora Elisa Dvornik, Andrej Georgiou, Christos Giblin, Benjamin Harnois-Déraps, Joachim Heymans, Catherine Hildebrandt, Hendrik Hoekstra, Henk Joudaki, Shahab Kuijken, Konrad Li, Shun-Sheng Linke, Laila Loureiro, Arthur Mahony, Constance Moscardini, Lauro Porth, Lucas Radovich, Mario Tröster, Tilman von Wietersheim-Kramsta, Maximilian Yan, Ziang Yoon, Mijin Zhang, Yun-Hao |
| author_facet | Reischke, Robert Stölzner, Benjamin Joachimi, Benjamin Wright, Angus H. Asgari, Marika Bilicki, Maciej Chisari, Nora Elisa Dvornik, Andrej Georgiou, Christos Giblin, Benjamin Harnois-Déraps, Joachim Heymans, Catherine Hildebrandt, Hendrik Hoekstra, Henk Joudaki, Shahab Kuijken, Konrad Li, Shun-Sheng Linke, Laila Loureiro, Arthur Mahony, Constance Moscardini, Lauro Porth, Lucas Radovich, Mario Tröster, Tilman von Wietersheim-Kramsta, Maximilian Yan, Ziang Yoon, Mijin Zhang, Yun-Hao |
| contents | We constrained 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 could combine these datasets reliably for the first time. Additionally, we used CMB lensing, galaxy redshift-space distortions, and baryon acoustic oscillations. We assessed, in turn, the effects of spatial curvature, varying neutrino masses, and an evolving dark energy component on cosmological constraints from KiDS-Legacy alone and from KiDS-Legacy combined with external probes. We find KiDS-Legacy to be consistent with the fiducial flat $Λ$-cold dark matter ($Λ$CDM) analysis with $c^2 \sum m_ν\leq 1.5\,$eV, $w_0 = -1.0\pm 0.7$, and $w_a = -1.3^{+1.9}_{-2.0}$ while $Ω_K = 0.08^{+0.16}_{-0.17}$ (1$σ$ bounds) with an almost equal goodness of fit. The $w_0w_a$CDM model is not a significant improvement over $Λ$CDM when cosmic shear and CMB lensing are combined, yielding a Bayes factor $B = 0.07$. If all probes are combined, however, $B$ increases to 2.73, corresponding to a $2.6σ$ suspiciousness tension. The constraint on $S_8 = σ_8\sqrt{Ω_\mathrm{m}/0.3}$ is robust to opening up the parameter space for cosmic shear. Adding all external datasets to KiDS-Legacy, we find $S_8 = 0.816 \pm 0.006$ in $Λ$CDM and $S_8 = 0.837 \pm 0.008$ in $w_0 w_a$CDM for all probes combined. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_11041 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | KiDS-Legacy: Constraining dark energy, neutrino mass, and curvature Reischke, Robert Stölzner, Benjamin Joachimi, Benjamin Wright, Angus H. Asgari, Marika Bilicki, Maciej Chisari, Nora Elisa Dvornik, Andrej Georgiou, Christos Giblin, Benjamin Harnois-Déraps, Joachim Heymans, Catherine Hildebrandt, Hendrik Hoekstra, Henk Joudaki, Shahab Kuijken, Konrad Li, Shun-Sheng Linke, Laila Loureiro, Arthur Mahony, Constance Moscardini, Lauro Porth, Lucas Radovich, Mario Tröster, Tilman von Wietersheim-Kramsta, Maximilian Yan, Ziang Yoon, Mijin Zhang, Yun-Hao Cosmology and Nongalactic Astrophysics We constrained 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 could combine these datasets reliably for the first time. Additionally, we used CMB lensing, galaxy redshift-space distortions, and baryon acoustic oscillations. We assessed, in turn, the effects of spatial curvature, varying neutrino masses, and an evolving dark energy component on cosmological constraints from KiDS-Legacy alone and from KiDS-Legacy combined with external probes. We find KiDS-Legacy to be consistent with the fiducial flat $Λ$-cold dark matter ($Λ$CDM) analysis with $c^2 \sum m_ν\leq 1.5\,$eV, $w_0 = -1.0\pm 0.7$, and $w_a = -1.3^{+1.9}_{-2.0}$ while $Ω_K = 0.08^{+0.16}_{-0.17}$ (1$σ$ bounds) with an almost equal goodness of fit. The $w_0w_a$CDM model is not a significant improvement over $Λ$CDM when cosmic shear and CMB lensing are combined, yielding a Bayes factor $B = 0.07$. If all probes are combined, however, $B$ increases to 2.73, corresponding to a $2.6σ$ suspiciousness tension. The constraint on $S_8 = σ_8\sqrt{Ω_\mathrm{m}/0.3}$ is robust to opening up the parameter space for cosmic shear. Adding all external datasets to KiDS-Legacy, we find $S_8 = 0.816 \pm 0.006$ in $Λ$CDM and $S_8 = 0.837 \pm 0.008$ in $w_0 w_a$CDM for all probes combined. |
| title | KiDS-Legacy: Constraining dark energy, neutrino mass, and curvature |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2512.11041 |