Weak Lensing Skew-Spectrum
  We introduce the skew-spectrum statistic for weak lensing convergence
$\kappa$ maps and test it against state-of-the-art high-resolution all-sky
numerical simulations.
  We perform the analysis as a function of source redshift and smoothing
angular scale for individual tomographic bins. We also analyse the
cross-correlation between different tomographic bins.
  We compare the numerical results to fitting-functions used to model the
bispectrum of the underlying density field as a function of redshift and scale.
We derive a closed form expression for the skew-spectrum for gravity-induced
secondary non-Gaussianity.
  We also compute the skew-spectrum for the projected $\kappa$ inferred from
Cosmic Microwave Background (CMB) studies.
  As opposed to the low redshift case we find the post-Born corrections to be
important in the modelling of the skew-spectrum for such studies. We show how
the presence of a mask and noise can be incorporated in the estimation of a
skew-spectrum.
