Non-Gaussianity from Entanglement During Inflation

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.