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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-4370
DTSTART:20170328T203000Z
DURATION:PT1H0M0S
DTSTAMP:20240329T043649Z
LAST-MODIFIED:20170331T135715Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Cosmology from Non-Linear Weak Lensing\, Theory Seminar (High
Energy/Cosmology)\, Zoltan Haiman\, Columbia Univ
DESCRIPTION:Several large astronomical surveys have either been propos
ed or are underway to measure weak lensing distortions of up to a bill
ion galaxies. This will allow accurate measurement of the lensing shea
r field in the small-scale\, non-linear regime\, where non-Gaussian fe
atures can contain significant cosmological information. I will repor
t on results from a large suite of ray-tracing N-body simulations in d
ifferent cosmologies\, and discuss constraints from the number counts
of lensing peaks (i.e. from the number of maxima as a function of thei
r height)\, and from other statistics probing the non-linear
\
nregime. These statistics can tighten cosmological constraints by a f
actor of two\, compared to using two-point statistics alone. A recent
application of this approach to the CFHTLenS survey has confirmed thi
s for the parameters (Omega_m\,sigma_8). I will comment on the theore
tical and simulation challenges for larger lensing surveys in
\nthe future.
URL:https://www.physics.wisc.edu/events/?id=4370
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