Non-Gaussianity in D3-brane inflation

Understand

We update predictions for observables in the "delicate" D3/anti-D3 inflationary model on the conifold.

• We use a full CMB likelihood calculation to assess goodness-of-fit, which is necessary because in this model the zeta power spectrum often cannot be modelled as a power-law over observable scales.
• For the first time we are able to provide accurate forecasts for the amplitude of three-point correlations.
• In a significant portion of its parameter space the model follows Maldacena's single-field prediction fNL ~ -(5/12)(ns-1) if nt << 1.