The Weight of Emptiness: The Gravitational Lensing Signal of Stacked
  Voids
  The upcoming new generation of spectroscopic galaxy redshift surveys will
provide large samples of cosmic voids, the distinct, large underdense
structures in the universe. Combining these with future galaxy imaging surveys,
we study the prospects of probing the underlying matter distribution in and
around cosmic voids via the weak gravitational lensing effects of stacked
voids, utilizing both shear and magnification information. The statistical
precision is greatly improved by stacking together a large number of voids
along different lines of sight, even when taking into account the impact of
inherent miscentering and projection effects. We show that Dark Energy Task
Force Stage IV surveys, such as the Euclid satellite and the Large Synoptic
Survey Telescope, should be able to detect the void lensing signal with
sufficient precision from stacking abundant medium-sized voids, thus providing
direct constraints on the matter density profile of voids independent of
assumptions on galaxy bias.
