KLT-Like Behaviour of Inflationary Graviton Correlators
  We use the spinor helicity formalism to study KLT-like relations for the
inflationary graviton four-point correlation function. New features are
observed in this correlation function compared to the graviton scattering
amplitude in flat spacetime. After obtaining the general momentum dependence,
collinear, squeezed and collapsed limits are considered to further study the
features of the correlation function, and the relation to the corresponding
flat space scattering amplitude.
