General formula for the running of local fNL
  We compute the scale dependence of fNL for models of multi-field inflation,
allowing for an arbitrary field space metric. We show that, in addition to
multi-field effects and self interactions, the curved field space metric
provides another source of scale dependence, which arises from the field-space
Riemann curvature tensor and its derivatives. The scale dependence may be
detectable within the near future if the amplitude of fNL is not too far from
the current observational bounds.
