KLT-Like Behaviour of Inflationary Graviton Correlators
Shing Yan Li, Yi Wang, Siyi Zhou
TL;DR
This paper explores KLT-like relations for inflationary graviton four-point functions using spinor helicity formalism, revealing new features and analyzing various limits to connect with flat spacetime scattering amplitudes.
Contribution
It introduces a novel application of spinor helicity formalism to inflationary graviton correlators and uncovers new features compared to flat spacetime amplitudes.
Findings
New features in inflationary graviton correlators compared to flat spacetime amplitudes
Analysis of collinear, squeezed, and collapsed limits of the correlation function
Relation established between inflationary correlators and flat space scattering amplitudes
Abstract
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.
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