  We investigate the cosmological Fisher information in the non-linear
dark-matter power spectrum in the context of the halo model. We find that there
is a plateau in information content on translinear scales which is generic to
all cosmological parameters we tried. There is a rise in information on smaller
scales, but we find that it is quite degenerate among different cosmological
parameters (except, perhaps, the tilt). This suggests that it could be
difficult to constrain cosmological parameters using the non-linear regime of
the dark-matter power spectrum. We suggest ways to get around this problem,
such as removing the largest haloes from consideration in survey analysis.
