  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.
