Diffractive Microlensing: A New Probe of the Local Universe
  Diffraction is important when nearby substellar objects gravitationally lens
distant stars. If the wavelength of the observation is comparable to the
Schwarzschild radius of lensing object, diffraction leaves an observable
imprint on the lensing signature. The SKA may have sufficient sensitivity to
detect the typical sources, giant stars in the bulge. The diffractive
signatures in a lensing event break the degeneracies between the mass of the
lens, its distance and proper motion.
