Probing Two-Field Open Inflation by Resonant Signals in Correlation Functions

Abstract

We derive oscillatory signals in correlation functions in two-field open inflation by means of the in-in formalism; such signatures are caused by resonances between oscillations in the tunnelling field and fluctuations in the inflaton during the curvature dominated, intermediate and subsequent inflationary regime. While amplitudes are model-dependent, we find distinct oscillations in the power and bi-spectrum that can act as a direct probe of the curvature dominated phase and thus, indirectly, strengthen the claim of the string landscape if they were observed. We comment on the prospects of detecting these tell-tale signs in current experiments, which is challenging, but not impossible. At the technical level, we pay special attention to the applicability conditions for truncation fluctuations to the light (inflaton) field and derive upper limits on the oscillation amplitude of the heavy field. A violation of these bounds requires a multi-field analysis at the perturbed level.

42 pages, 9 figures

References in corpus (15)

• The Effective Field Theory of Inflation
• Primordial Non-Gaussianities from Inflation Models
• Effective Field Theory for Inflation
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Mass hierarchies and non-decoupling in multi-scalar field dynamics
• Heavy fields, reduced speeds of sound and decoupling during inflation
• New Universal Local Feature in the Inflationary Perturbation Spectrum
• The "in-in" Formalism and Cosmological Perturbations
• Curvature Perturbation Spectrum in Two-field Inflation with a Turning Trajectory
• Measure and Probability in Cosmology
• Searching for Standard Clocks in the Primordial Universe
• Exploring a string-like landscape
• On the Unlikeliness of Multi-Field Inflation: Bounded Random Potentials and our Vacuum
• Giant Rings in the CMB Sky
• How Flat is Our Universe Really?

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