Cosmology from cross correlation of CMB lensing and galaxy surveys
  In recent years cross correlation of lensing of the Cosmic Microwave
Background (CMB) with other large scale structure (LSS) tracers has been used
as a method to detect CMB lensing. Current experiments are also becoming
sensitive enough to measure CMB lensing without the help of auxiliary tracers.
As data quality improves rapidly, it has been suggested that the CMB
lensing-LSS cross correlation may provide new insights into parameters
describing cosmological structure growth. In this work we perform forecasts
that combine the lensing potential auto power spectrum from various future CMB
experiments, the galaxy power spectrum from galaxy surveys, as well as the
cross power spectrum between the two, marginalizing over a number galactic and
non-galactic cosmological parameters. We find that the CMB lensing-LSS cross
correlation contains significant information on parameters such as the redshift
distribution and bias of LSS tracers. We also find that the cross correlation
information will lead to independent probes of cosmological parameters such as
neutrino mass and the reionization optical depth.
