PIRSA:15040051

Inference of weak gravitational lensing signals from sky images

Bernstein, G. (2015). Inference of weak gravitational lensing signals from sky images. Perimeter Institute. https://pirsa.org/15040051

Bernstein, Gary. Inference of weak gravitational lensing signals from sky images. Perimeter Institute, Apr. 14, 2015, https://pirsa.org/15040051 

          @misc{ pirsa_PIRSA:15040051,
            doi = {10.48660/15040051},
            url = {https://pirsa.org/15040051},
            author = {Bernstein, Gary},
            keywords = {Cosmology},
            language = {en},
            title = {Inference of weak gravitational lensing signals from sky images},
            publisher = {Perimeter Institute},
            year = {2015},
            month = {apr},
            note = {PIRSA:15040051 see, \url{https://pirsa.org}}
          }

Gary Bernstein

University of Pennsylvania

Talk number
PIRSA:15040051
Collection
Talk Type
Subject
Abstract

Weak gravitational lensing is a highly valued tool for inferring the structure of the spacetime metric between an observer and a cosmologically distant “wallpaper,” most commonly either the CMB or faint background galaxies. The best-measured quantities are the second derivatives of the projected scalar potential(s), which are manifested as apparent shearing and magnification of the wallpaper.  Given a collection of faint-galaxy images, what information can we extract about the shear and magnification that these images have undergone?  I will describe a new method of lensing inference that, unlike predecessors, is rigorously correct in the presence of noise and other observational realities, nearly optimal, and computationally feasible at the scale of current/future surveys like the Dark Energy Survey and the Large Synoptic Survey Telescope.