KiDS-Legacy: WIMP dark matter constraints from the cross-correlation of weak lensing and Fermi-LAT gamma rays
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| Autores principales: | , , , , , , , , , , , , , , , |
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2026
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| author | Zhang, Shiyang Hildebrandt, Hendrik Yan, Ziang Tröster, Tilman Aravinthan, Athithya Asgari, Marika Bartlett, Deaglan J. Bilicki, Maciej Elsässer, Dominik Heymans, Catherine Joachimi, Benjamin Moscardini, Lauro Neumann, Dennis Paopiamsap, Anya Reischke, Robert Stölzner, Benjamin |
| author_facet | Zhang, Shiyang Hildebrandt, Hendrik Yan, Ziang Tröster, Tilman Aravinthan, Athithya Asgari, Marika Bartlett, Deaglan J. Bilicki, Maciej Elsässer, Dominik Heymans, Catherine Joachimi, Benjamin Moscardini, Lauro Neumann, Dennis Paopiamsap, Anya Reischke, Robert Stölzner, Benjamin |
| contents | Dark matter dominates the matter content of the Universe, and its properties can be constrained through large-scale structure probes such as the cross-correlation between the unresolved gamma-ray background (UGRB) and weak gravitational lensing. We analysed 15 years of Fermi-LAT data, constructing UGRB intensity maps in ten energy bins (0.5-1000 GeV), and cross-correlated them with KiDS-Legacy shear in six tomographic bins. The measurements were performed using angular power spectra estimated with the pseudo-$C_\ell$ method. No significant cross-correlation is found. Based on this non-detection, we present 95% upper bounds on the weakly interacting massive particle (WIMP) decay rate $Γ_{\rm dec}$ and velocity-averaged annihilation cross-section $\langleσ_{\rm ann} v\rangle$ as functions of mass. We compare our results with bounds from other cosmological tracers and from local probes, and found them to be complementary, particularly at low masses ($\rm GeV/TeV$). In addition, using a Euclid-like lensing survey cross-correlated with Fermi-LAT, we forecast $\sim$2 times tighter limits, highlighting the potential of forthcoming data to strengthen constraints on dark matter annihilation and decay. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_11223 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | KiDS-Legacy: WIMP dark matter constraints from the cross-correlation of weak lensing and Fermi-LAT gamma rays Zhang, Shiyang Hildebrandt, Hendrik Yan, Ziang Tröster, Tilman Aravinthan, Athithya Asgari, Marika Bartlett, Deaglan J. Bilicki, Maciej Elsässer, Dominik Heymans, Catherine Joachimi, Benjamin Moscardini, Lauro Neumann, Dennis Paopiamsap, Anya Reischke, Robert Stölzner, Benjamin Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Dark matter dominates the matter content of the Universe, and its properties can be constrained through large-scale structure probes such as the cross-correlation between the unresolved gamma-ray background (UGRB) and weak gravitational lensing. We analysed 15 years of Fermi-LAT data, constructing UGRB intensity maps in ten energy bins (0.5-1000 GeV), and cross-correlated them with KiDS-Legacy shear in six tomographic bins. The measurements were performed using angular power spectra estimated with the pseudo-$C_\ell$ method. No significant cross-correlation is found. Based on this non-detection, we present 95% upper bounds on the weakly interacting massive particle (WIMP) decay rate $Γ_{\rm dec}$ and velocity-averaged annihilation cross-section $\langleσ_{\rm ann} v\rangle$ as functions of mass. We compare our results with bounds from other cosmological tracers and from local probes, and found them to be complementary, particularly at low masses ($\rm GeV/TeV$). In addition, using a Euclid-like lensing survey cross-correlated with Fermi-LAT, we forecast $\sim$2 times tighter limits, highlighting the potential of forthcoming data to strengthen constraints on dark matter annihilation and decay. |
| title | KiDS-Legacy: WIMP dark matter constraints from the cross-correlation of weak lensing and Fermi-LAT gamma rays |
| topic | Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2601.11223 |