Bispectrum at 1-loop in the Effective Field Theory of Inflation

Abstract

In this paper we compute 1-loop corrections to the bispectrum in the decoupling limit of the Effective Field Theory of Inflation (EFToI). We regulate the divergences by employing dimensional regularization and work in d = 3 + δ dimensions. We find that the final results feature analytic structures of the form log (ki/kT) and log (H/μ), where H is the Hubble parameter and μ is the renormalisation scale. An interesting outcome of our calculations is that unlike the 1-loop correction to the power-spectrum computed in [1] the unrenormalised answers always produce unphysical logarithms of co-moving momenta. These unphysical logarithms are cancelled only after renormalisation. We expect this to be a generic feature for loop computations unless there is some cancellation as in the previously computed 1-loop result for the power-spectrum.