In the past three decades, one of the most transformative insights in cosmology has been the realisation that the formation and evolution processes of cosmic structures such as supermassive black-holes, galaxies and clusters are deeply interconnected with the vast cosmic web that underpins the Universe. These processes do not happen in isolation, but are part of a dynamic ecosystem where matter and energy flow across scales, driving the growth and transformation of cosmic environments. Understanding this complex system, in particular the circum-galactic medium (CGM), is not only key to deciphering how matter is cycled and redistributed through accretion via filaments and outflows from AGN and supernovae, but also crucial for unlocking the next generation of discoveries in areas such as dark matter, the behaviour of the cosmic web, the forces that shape cosmic evolution, and more.
This workshop seeks to bring together cosmologists and astrophysicists to foster collaborative exploration of these interconnected cosmic ecosystems. By focusing on how structures interact with their environments across cosmic scales, this workshop aims to catalyse groundbreaking discoveries in both astronomy and physics, providing fresh insights into the forces that govern the Universe. Special attention will be given to the joint analysis of large-scale structure and weak gravitational lensing data from surveys such as DESI, Euclid, LSST and Roman with CMB data from the Simons Observatory and CMB-S4, as well as how these can be integrated with observations of JWST, and existing and upcoming observations of X-ray emission, UV/X-ray absorption toward quasars, 21-cm emission, and FRBs.
The goal is to explore the complementarity of these data sets and how their alignment can provide new insights into the interconnected processes shaping cosmic environments, particularly through joint modelling and simulations of many phases of gas and feedback across different regimes. Attention will also be given to bridging the gap between how cosmologists and astronomers approach the CGM, either top-down large-scale and hot and virial phase, vs bottom-up, cooler phases, at smaller scales.
Topics will include:
· Cosmic mass budget, including a census of where the baryons are.
· Effect of baryons on dark matter structures on small and large scales.
· Cosmic evolution of large-scale structures.
· Bridging the gap between different probes.
The time has never been more right to unify these fields, as advances in observation, theory and simulations are poised to open new paths to revealing the cosmos’ most profound mysteries.
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Organizing Committee (LOC)
Selim Hotinli (Perimeter Institute)
Neal Dalal (Perimeter Institute)
Mike Hudson (University of Waterloo, Waterloo Centre for Astrophysics)
Matt Johnson (Perimeter Institute)
Katie Mack (Perimeter Institute)
Brian McNamara (University of Waterloo, Waterloo Centre for Astrophysics)
Kendrick Smith (Perimeter Institute)
Arielle Phillips (University of Notre Dame / Simons Emmy Noether Fellow at Perimeter Institute)
Scientific Organizing Committee (SOC)
Nick Battaglia (Cornell)
Hsiao-Wen Chen (University of Chicago)
Megan Donahue (Michigan State University)
Claude-André Faucher-Giguère (Northwestern)
Cameron Hummels (Caltech)
Selim Hotinli (Perimeter Institute)
Ian McCarthy (Liverpool John Moores University)
Daisuke Nagai (Yale)
Gwen Rudie (Carnegie Institution for Science)
Freeke van de Voort (Cardiff University)
Jessica Werk (University of Washington)
