Speaker
Description
We are investigating if the double copy structure as product of scattering amplitudes
of gauge theories applies to cosmological correlators computed, in a class of theories for
inflation, by the operatorial version of the In-In formalism of Schwinger-Keldysh. We
consider tree level momentum-space correlators involving primordial gravitational waves
with different polarizations and the scalar curvature fluctuations on a three dimensional
fixed spatial slice. The correlators are sum of terms factorized in a time dependent scalar
factor, which takes into account the curved background where energy is not conserved,
and in a so-called tensor factor, constructed by polarization tensors. In the latter we
recognize scattering amplitudes in four dimensional Minkowski space spanned by three
points gravitational amplitudes related by double copy to those of gauge theories. Our
study indicates that gravitational waves are double copy of gluons and the primordial
scalar curvature is double copy of a scalar with Higgs-like interactions.
