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SUMMARY:Everything is connected: galaxy properties couple internally\, env
 ironmentally\, and historically - Christian Kragh Jespersen (Princeton Uni
 versity)
DTSTART:20241209T160000Z
DTEND:20241209T170000Z
UID:TALK223060@talks.cam.ac.uk
CONTACT:65128
DESCRIPTION:Galaxy properties couple in opaque ways\, as they depend on ea
 ch other\, large-scale environment\, and the history of the galaxy. Unfort
 unately\, widely used statistical models of galaxies ignore all of these d
 ue to the difficulties of incorporating them. I will introduce graph neura
 l networks as the tools necessary to accurately introduce environmental an
 d historical dependencies into a statistical framework\, and prove a surpr
 ising connection between the merger histories and environments of galaxies
 . I will then show how galaxy component coupling is implicitly treated in 
 common inference codes\, how this implicit treatment impacts the inference
 \, and how we can let data lead us to fix it.
LOCATION:Martin Ryle Seminar Room\, KICC
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