Primordial non-Gaussianities in single field inflationary models with non-trivial initial states

Abstract

We compute the non-Gaussianities that arise in single field, slow roll inflationary models arising from arbitrary homogeneous initial states, as well as subleading contributions to the power spectrum. Non Bunch-Davies vacuum initial states can arise if the transition to the single field, slow roll inflation phase occurs only shortly before observable modes left the horizon. They can also arise from new physics at high energies that has been integrated out. Our general result for the bispectrum exhibits several features that were previously seen in special cases.

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• Anisotropic non-Gaussianity from Rotational Symmetry Breaking Excited Initial States
• Higher Order Corrections to Asymptotic-de Sitter Inflation
• Looking for non-Gaussianity in all the right places: A new basis for non-separable bispectra
• Non-Gaussianities in generalized non-local $R^2$-like inflation
• Inflationary non-Gaussianities in alpha vacua and consistency with conformal symmetries
• Stochastic gravitational wave background anisotropies from inflation with non-Bunch-Davies states