Inference of weak gravitational lensing signals from sky images
APA
Bernstein, G. (2015). Inference of weak gravitational lensing signals from sky images. Perimeter Institute. https://pirsa.org/15040051
MLA
Bernstein, Gary. Inference of weak gravitational lensing signals from sky images. Perimeter Institute, Apr. 14, 2015, https://pirsa.org/15040051
BibTex
@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}} }
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.