| Speaker: | Daniela Galárraga-Espinosa (Kavli IPMU) |
|---|---|
| Title: | Bridging galaxy formation and cosmology with multi-scale filaments |
| Date (JST): | Wed, Apr 22, 2026, 11:00 - 12:00 |
| Place: | Lecture Hall |
| Abstract: |
Our current methods to study the Universe rely heavily on collapsed structures (haloes, galaxies, clusters) but these are only the nodes of a complex cosmic web, connected by a pervasive filamentary structure found at all scales. Filaments host over 50% of matter today, trace the structure and geometry of the Universe at large-scales, direct the flows of matter, feed galaxies with the fuel required for star formation, and determine the location of newborn stars within molecular clouds. Despite their central role, filaments remain among the most under-explored structures in astrophysics and cosmology, largely because they are difficult to detect, model, and characterize. In this talk, I will show how I have tackled these challenges, as well as my plan to fully extract and exploit the information contained in filaments at all scales. I will first present a physical characterisation of filaments and their evolution since z=4 using state-of-the-art hydrodynamical simulations. I will then zoom in to galaxy scales to show how smaller-scale streams influence star formation activity, and I will present their first statistical detection in observations. I will conclude by presenting how the multi-scale cosmic web is a powerful bridge between galaxy formation and cosmology, helping to address key questions in galaxy evolution while opening new ways to constrain the fundamental properties of our Universe. |
