Abstract
We study the observable signatures of the quantum nature of inflation. We propose a method to observe the oscillatory primordial quantum clock signal when sufficient data is unavailable due to UV and IR cutoffs, by observing the position of the peak of the signal, which is shown to vary in a Compton scattering like fashion. As a separate proposal, we propose a construction of Bell inequality from cosmological data. After considering the conditions required for Bell experiments, and their applicability to the context of inflation, we propose a Bell experiment in a model with massive scalar fields. We discuss possible modifications to the standard Bell set-up to better suit cosmological observations.