Speaker
Description
Gravitational lensing effect analysis allows us to find the matter distribution in galactic clusters. For example, such an analysis at the Bullet Cluster suggested convincingly in favor of the existence of dark matter. However, in this analysis, it was assumed that the average of the original orientation of galaxies in a small patch of sky is zero. While this assumption is reasonable, it can lead to some errors, if there are not enough many galaxies in each patch, or the orientation of each galaxy is not random. Luckily, it is now possible to measure the orientation of each galaxy, as the polarization of radio waves from each galaxy correlates with its orientation. In this talk, we will derive formulas that can be directly applied to the re-analysis of the gravitational lensing effect using polarization data.
