Title: Weak Lensing as a Dark Energy Probe Speaker: Dr. Zhaoming Ma University of Pennsylvania Date/Time: Thursday, April 23, 2009, 3:00 pm EST Place: BNL Physics Department, Small Seminar Room, 510A Abstract: --------- First I will introduce weak lensing as a potentially very promising dark energy probe. Then I will talk in detail the systematic errors and how to successfully control them. In particular, photometric redshift errors, PSF uncertainties and the matter power spectrum.