Weighing neutrinos with the halo environment
  Nonlinear objects like halos and voids exhibit a scale-dependent bias on
linear scales in massive neutrino cosmologies. The shape of this
scale-dependent bias is a unique signature of the neutrino masses, but the
amplitude of the signal is generally small, of the order of $f_\nu$, the
contribution of neutrinos to the total matter content ($\lesssim 1\%$). In this
paper, we demonstrate for the first time how the strength of this signal can be
substantially enhanced by using information about the halo environment at a
range of scales. This enhancement is achieved by using certain combinations of
the large scale Cold Dark Matter and total matter environments of halos, both
of which are measurable from galaxy clustering and weak lensing surveys.
