Non-Gaussianity from Entanglement During Inflation

Abstract

We compute the bi-spectrum of CMB temperature fluctuations for a state where the metric perturbation $\zeta$ is entangled with a spectator scalar field $\chi$. Novel terms in the cubic $\zeta$ action coupled to the scalar can be the dominant contribution to the bi-spectrum for such states and we highlight the differences between this result and the no-entanglement bi-spectrum. New shapes can be important in the bi-spectra leading to distinctive observational signatures.

arXiv comment17 pages, 7 figures

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• The Open Effective Field Theory of Inflation
• Cosmic decoherence: primordial power spectra and non-Gaussianities
• Entanglement negativity in de Sitter biverse from Stringy Axionic Bell pair: An analysis using Bunch-Davies vacuum
• Entanglement masquerading in the CMB
• Does Planck Actually "See" the Bunch-Davies State?
• Fluctuations and non-Gaussianity in de Sitter spacetime from holographic entanglement entropy
• Origin & evolution of the Universe