Improving geometric and dynamical constraints on cosmology with
  intrinsic alignments of galaxies
  We show that the spatial correlation of the intrinsic alignments (IAs) of
galaxies, measured in galaxy redshift surveys, offers a precision route to
improve the geometrical and dynamical constraints on cosmology. The IA has been
treated as a contaminant against cosmological probes such as weak gravitational
lensing experiments. However, the large-scale correlation of IAs is expected to
follow the coherent large-scale matter inhomogeneities. Here, making use of its
anisotropic nature, we show that the large-scale IA correlations help to
improve the measurements of the geometric distances and growth of structure. In
combination with the conventional galaxy clustering statistics, we find that
constraints on equation-of-state parameter for dark energy and Hubble parameter
can be tighter than those from the clustering statistics alone by a factor of
more than 1.5.
