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SUMMARY:Tracing the Hidden Universe: An Integrated View of Baryons Across 
 Cosmic Time - Boryana Hadzhiyska
DTSTART:20251030T160000Z
DTEND:20251030T170000Z
UID:TALK239878@talks.cam.ac.uk
CONTACT:Matthew Grayling
DESCRIPTION:Understanding how galaxies form and evolve requires connecting
  two traditionally separate frontiers of astrophysics: the physics of bary
 ons that shape stars\, gas\, and black holes\, and the cosmological framew
 ork that governs dark matter and dark energy. Over the past decade\, a new
  generation of observations: spanning imaging and spectroscopic surveys\, 
 cosmic microwave background maps\, and X-ray data\, has begun to reveal ho
 w these components fit together into a single\, coherent picture of struct
 ure formation. In this talk\, I will discuss recent progress toward buildi
 ng an integrated view of baryons across cosmic time: how the gas that fuel
 s galaxies and black holes traces\, cools\, and feeds back into the cosmic
  web. I will show how combining cosmological and astrophysical probes\, fr
 om large-scale galaxy redshift surveys like DESI and photometric experimen
 ts like Rubin Observatory\, to CMB secondary anisotropies (the thermal and
  kinematic Sunyaev–Zel’dovich effects)\, allows us to directly map whe
 re the Universe’s ordinary matter resides and how energetic processes su
 ch as supermassive black hole feedback redistribute it. These advances not
  only illuminate key aspects of galaxy formation and evolution but also ha
 ve profound implications for cosmology. The influence of baryons on the di
 stribution of matter represents one of the dominant sources of uncertainty
  in weak lensing and clustering measurements\, and hence in our efforts to
  pin down the nature of dark matter and dark energy. By linking multi-wave
 length observations with next-generation simulations\, we can now begin to
  bridge this gap\, connecting the smallest scales of galaxy formation with
  the largest scales of the cosmic web\, and turning the messy physics of b
 aryons into a new window on fundamental physics.
LOCATION:Hoyle Lecture Theatre\, Institute of Astronomy
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