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UID:UW-Physics-Event-4401
DTSTART:20170207T220000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T050827Z
LAST-MODIFIED:20170130T203844Z
LOCATION:4274 Chamberlin Hall
SUMMARY:Cosmology with the Hydrogen Epoch of Reionization Array\, NPAC
  (Nuclear/Particle/Astro/Cosmo) Forum\, Daniel Jacobs\, Arizona State
DESCRIPTION:Measurements of the distribution of matter on cosmological
  scales have played a transformational role in our understanding of th
 e standard model revealing that most of the energy of the universe rem
 ains unaccounted for by the standard model. Observations of Hydrogen v
 ia the highly redshifted 21 cm line trace out the matter distribution 
 on large scales at epochs of cosmic time unreachable by most other met
 hods to give us another cosmological matter tracer.  The Hydrogen Epoc
 h of Reionization Array\, which is currently under construction will b
 e the first instrument to bring sufficient sensitivity to characterize
  the 21cm signal and break degeneracies in cosmological measurements t
 o improve several parameters including the sum of the neutrino masses.
  Much can also be learned about the formation of structure and the ver
 y first stars and black holes.  Applying the same techniques to nearby
  frequency bands\, arrays like Tienlai in China and CHIME in Canada ar
 e working towards better constraints on the dark energy equation of st
 ate. The experimental challenge for all is in discriminating faint bac
 kground from bright foregrounds. To meet this challenge I am building 
 new methods of precision instrument construction\, calibration\, and a
 nalysis methods.  In this talk we’ll learn about a couple of these e
 fforts including the development of drone-based calibration and scalab
 le cloud analysis for PB-scale data sets. Finally we'll look briefly t
 o the future where large instruments are being built by the internatio
 nal community and even larger are considered by the US high energy/cos
 mology community for the next decade.
URL:https://www.physics.wisc.edu/events/?id=4401
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