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SEQUENCE:5
UID:UW-Physics-Event-8813
DTSTART:20250307T213000Z
DTEND:20250307T223000Z
DTSTAMP:20260413T201352Z
LAST-MODIFIED:20250228T180507Z
LOCATION:2241 CH
SUMMARY:Investigating cosmic origin and evolution with the oldest phot
 ons\, Physics Department Colloquium\, Zeeshan Ahmed\, SLAC National Ac
 celerator Laboratory
DESCRIPTION:The red-hot glow of the primordial universe\, after 13.8 b
 illion years of redshift\, is observed today by our telescopes as the 
 Cosmic Microwave Background (CMB). Spatial variations of CMB intensity
  and polarization across the sky provide a record of conditions in the
  early universe\, possibly encoding signatures from cosmic inflation a
 nd traces of undiscovered relic particles. Additionally\, the CMB ‘b
 acklights’ the universe’s large-scale structure and picks up the i
 nfluence of all matter\, including neutrinos\, on its way to us. Groun
 d-based CMB imaging instrumentation has made generational leaps in sen
 sitivity over the past few decades\, while our understanding and mitig
 ation of systematic errors in CMB measurements has advanced. Ongoing a
 nd upcoming experiments such as BICEP\, South Pole Telescope and Simon
 s Observatory will conduct the most sensitive search yet for inflation
 \, complement DESI and Rubin Observatory in aiding our understanding o
 f cosmic acceleration\, and enhance studies of neutrinos and dark matt
 er from direct experimental efforts. Additionally\, a future observato
 ry called CMB-S4 is the largest conceived ground-based CMB facility th
 at plans to map over 40% of the Southern sky to unprecedented sensitiv
 ity in the 2030s. I will report on the design\, status and latest resu
 lts from these efforts.
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URL:https://www.physics.wisc.edu/events/?id=8813
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