With the fast development of high-precision large photometric surveys, weak lensing (WL) effects have become one of the major probes in cosmology. While the two-point shear correlations are the most extensively employed analyses, other statistics beyond that are desired because of the non-Gaussian nature of cosmic structures. In this presentation, I will discuss the cosmological application of WL peak statistics, particularly the high peak statistics, which are closely related to nonlinear massive halos. Besides the commonly adopted peak height statistics, a new analysis based on the peak steepness will also be presented, and the relevant systematics will be discussed. In addition, I will discuss the potential of combining WL shear and magnification effects to calibrate the shear multiplicative bias using data alone to enhance the constraining power in cosmology.
BIO
Zuhui Fan received her Ph.D. from University of Washington in Seattle, U.S.A.. She was then a visiting scientist and a postdoc fellow at University of Chicago and Taiwan University/ASIAA, respectively. From 2002 to 2018, she was a professor at Department of Astronomy, School of Physics, Peking University. She moved to the South-Western Institute for Astronomy Research at Yunnan University at the end of 2018, and is now a Donglu (东陆) distinguished professor there. Her research area is in cosmology, aiming to explore different statistical probes and to understand potential systematic effects in the era of precision cosmology. She is leading the CSST photometric survey science preparation in cosmology, and coordinated the CSST-Euclid international team for joint weak lensing studies.
Host: Song Huang
