Speaker
Description
I will propose a technique called the "expanding ejecta method" (EEM) to determine angular diameter distances to supernovae based purely on geometry, augmenting the calibration of the cosmic distance ladder or even enabling a direct inference of the cosmic expansion rate. I will also introduce a new variant of intensity interferometry --- "extended-path intensity correlation". EPIC enables ground-based differential astrometry at microarcsecond-level precision on sources of high surface brightness, in a field of view as large as several arcseconds. The scientific applications of EPIC include measuring the astrometric lensing noise induced by the structure of dark matter on sub-parsec length scales (corresponding to halos with sub-stellar masses), an observable that is exquisitely sensitive to the microphysics of dark matter.
