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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-8282
DTSTART:20230512T170000Z
DTEND:20230512T180000Z
DTSTAMP:20260414T031940Z
LAST-MODIFIED:20230508T184447Z
LOCATION:Chamberlin 5280
SUMMARY:Probing The Impact of Cluster Weak Lensing Bias On DES Y1 Clus
 ter Cosmological Results\, NPAC (Nuclear/Particle/Astro/Cosmo) Forum\,
  Johnny Esteves\, University of Michigan
DESCRIPTION:Over the last two decades of large photometric surveys\, o
 ptical cluster cosmology has presented a promising way to improve cosm
 ological measurements and our current understanding of dark matter and
  dark energy. The Dark Energy Survey (DES) Y1 cluster's analysis has r
 evealed a new systematic effect that affects weak lensing measurements
 \, called weak lensing bias. The weak lensing bias arises from the cor
 relation between the mass proxy (such as richness or λ) and the lensi
 ng profile for a given mass. The effect is mainly caused by the presen
 ce of projected red galaxies along the line of sight\, which can bias 
 the mass estimate. However\, how this systematic effect impacted the Y
 1 cosmology is still unclear. <br>\n<br>\nIn this talk\, I will presen
 t a novel forward modeling methodology that was developed specifically
  for Y3 and outline the technical computing challenges involved in sol
 ving multi-dimensional integrals. These challenges have been overcome 
 by utilizing graphics processing units (GPUs)\, which provide exceptio
 nal computational speed and accuracy. In addition\, I will present my 
 work on the commissioning of the Rubin Observatory\, which will provid
 e invaluable data for advancing our cosmological understanding of the 
 Universe.
URL:https://www.physics.wisc.edu/events/?id=8282
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