Improved Cosmological Constraints from Morphology-Based Marked Correlation Functions

[2608.15083] Improved Cosmological Constraints from Morphology-Based Marked Correlation Functions Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Astrophysics > Cosmology and Nongalactic Astrophysics arXiv:2608.15083 (astro-ph) [Submitted on 15 Aug 2026] Title: Improved Cosmological Constraints from Morphology-Based Marked Correlation Functions Authors: Xu Xiao , Zhao Chen , Yu Yu , Xiao-Dong Li , Le Zhang View a PDF of the paper titled Improved Cosmological Constraints from Morphology-Based Marked Correlation Functions, by Xu Xiao and 4 other authors View PDF HTML (experimental) Abstract: The cosmic web contains morphology-dependent information that is not fully captured by standard two-point statistics. We construct morphology-based marked correlation functions (MCFs) by assigning marks to halos according to the cosmic-web morphology identified with the \textsc{Nexus} algorithm. Using the \textsc{Kun} simulation suite, which spans 129 $w_0w_a$CDM cosmologies, we build Gaussian-process emulators for the MCFs as functions of cosmological parameters and tracer bias. We then apply the emulators to mock halo catalogues from the independent \textsc{Jiutian} simulation and perform a joint likelihood analysis to quantify the resulting cosmological constraints. We consider two marker choices: a discrete morphology marker and a continuous morphology strength marker. The continuous marker improves the Figure of Merit (FoM) by a factor of $\sim 8.6$ relative to the standard 2PCF and reduces the $1\sigma$ uncertainty on $\sigma_8$ by a factor of $\sim 5$. The discrete marker gives a more modest FoM improvement of $\sim 17\%$. We further test the impact of tracer selection by varying the halo mass threshold by a factor of $\sim 4.5$. Even for the lowest mass threshold, the continuous marker remains unbiased and achieves a FoM about $\sim 3.4$ times higher than that of the 2PCF alone. These results show that morphology-based MCFs, combined with simulation-based emulation, provide a useful framework for extracting additional cosmological information from large-scale structure surveys. Comments: 18 pages, 13 figures Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO) Cite as: arXiv:2608.15083 [astro-ph.CO] (or arXiv:2608.15083v1 [astro-ph.CO] for this version) https://doi.org/10.48550/arXiv.2608.15083 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Xu Xiao [ view email ] [v1] Sat, 15 Aug 2026 07:00:53 UTC (616 KB) Full-text links: Access Paper: View a PDF of the paper titled Improved Cosmological Constraints from Morphology-Based Marked Correlation Functions, by Xu Xiao and 4 other authors View PDF HTML (experimental) TeX Source view license Current browse context: astro-ph.CO < prev | next > new | recent | 2026-08 Change to browse by: astro-ph References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... 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