James Sunseri – Power of the Cosmic Web

Research Talk | Cosmology from Home 2026 https://www.cosmologyfromhome.com/ Abstract: In this talk I will present our recent study of the cosmological information contained in the cosmic web, categorized as four structure types: nodes, filaments, walls, and voids, using the Quijote simulations and a modified version of the NEXUS+ algorithm. We show that splitting the density field by the four structure types and combining the power spectrum in each provides much tighter constraints on cosmological parameters than using the power spectrum without splitting. We show the rich information contained in the cosmic web structures for measuring all of the cosmological parameters, and in particular for constraining neutrino mass. We study the constraints as a function of Fourier scale, configuration space smoothing scale, and the underlying field. For the matter field with kmax = 0.5 h/Mpc, we find a factor of ×20 tighter constraints on neutrino mass when using smoothing scales larger than 12.5 Mpc/h, and ×80 tighter when using smoothing scales down to 1.95 Mpc/h. However, for the CDM+Baryon field we observe a more modest ×1.7 or ×3.6 improvement, for large and small smoothing scales respectively. Alongside these results I will advertise our fast, easy-to-use, publicly available code (pycosmmommf) for identifying cosmic structures from data.