Theory Seminar (High Energy/Cosmology) |
Events During the Week of March 26th through April 2nd, 2017
Monday, March 27th, 2017
- No events scheduled
Tuesday, March 28th, 2017
- Cosmology from Non-Linear Weak Lensing
- Time: 3:30 pm
- Place: 5280 Chamberlin Hall
- Speaker: Zoltan Haiman, Columbia Univ
- Abstract: Several large astronomical surveys have either been proposed or are underway to measure weak lensing distortions of up to a billion galaxies. This will allow accurate measurement of the lensing shear field in the small-scale, non-linear regime, where non-Gaussian features can contain significant cosmological information. I will report on results from a large suite of ray-tracing N-body simulations in different cosmologies, and discuss constraints from the number counts of lensing peaks (i.e. from the number of maxima as a function of their height), and from other statistics probing the non-linear<br>
regime. These statistics can tighten cosmological constraints by a factor of two, compared to using two-point statistics alone. A recent application of this approach to the CFHTLenS survey has confirmed this for the parameters (Omega_m,sigma_8). I will comment on the theoretical and simulation challenges for larger lensing surveys in<br>
the future. - Host: Joshua Berger
Wednesday, March 29th, 2017
- No events scheduled
Thursday, March 30th, 2017
- No events scheduled
Friday, March 31st, 2017
- No events scheduled