Imprints of Oscillatory Bispectra on Galaxy Clustering
  Long-short mode coupling during inflation, encoded in the squeezed bispectrum
of curvature perturbations, induces a dependence of the local, small-scale
power spectrum on long-wavelength perturbations, leading to a scale-dependent
halo bias. While this scale dependence is absent in the large-scale limit for
single-field inflation models that satisfy the consistency relation, certain
models such as resonant non-Gaussianity show a peculiar behavior on
intermediate scales. We reconsider the predictions for the halo bias in this
model by working in Conformal Fermi Coordinates, which isolate the physical
effects of long-wavelength perturbations on short-scale physics. We find that
the bias oscillates with scale with an envelope similar to that of equilateral
non-Gaussianity. Moreover, the bias shows a peculiar modulation with the halo
mass. Unfortunately, we find that upcoming surveys will be unable to detect the
signal because of its very small amplitude. We also discuss non-Gaussianity due
to interactions between the inflaton and massive fields: our results for the
bias agree with those in the literature.
