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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-9502
DTSTART:20251203T170000Z
DTEND:20251203T190000Z
DTSTAMP:20260413T083901Z
LAST-MODIFIED:20251119T214215Z
LOCATION:Chamberlin Hall Room 5310
SUMMARY:Probing primordial non-gaussianity with large-scale velocity r
 econstruction using ACT and DESI-LS data\, Preliminary Exam\, Anderson
  Lai
DESCRIPTION:The large-scale velocity field of matter is a sensitive pr
 obe in several exciting areas of cosmology and astrophysics\, includin
 g cosmological parameters\, dark matter halo models\, and electron pro
 files. In addition\, by combining it with the large-scale velocity and
  galaxy overdensity fields\, one can obtain competitive constraints on
  local primordial non-Gaussianity. In this talk\, I will introduce kin
 ematic Sunyaev–Zeldovich (kSZ) tomography\, a modern technique for r
 econstructing the large-scale velocity field\, followed by a novel dev
 elopment in an optimal power-spectrum estimator that outperforms conve
 ntional approaches with highly compressed computation time. I will pre
 sent its latest application to observations from the Atacama Cosmology
  Telescope and DESI-LS (Legacy Survey)\, yielding a ~12σ detection of
  the kSZ signal—an improvement factor of ~3 compared to earlier stud
 ies. With upcoming data from the Simons Observatory and the Vera C. Ru
 bin Observatory\, there is a promising outlook for kSZ velocity recons
 truction.
URL:https://www.physics.wisc.edu/events/?id=9502
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