For non-minimally coupled many-field inflation with at least one ξ ≫ 1, CMB observables match single-field predictions, with explicit large-N formulas for e-folds, Hubble scale, and turn rate.
Initial conditions for slow-roll inflation in a random Gaussian landscape
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abstract
In the landscape perspective, our Universe begins with a quantum tunneling from an eternally-inflating parent vacuum, followed by a period of slow-roll inflation. We investigate the tunneling process and calculate the probability distribution for the initial conditions and for the number of e-folds of slow-roll inflation, modeling the landscape by a small-field one-dimensional random Gaussian potential. We find that such a landscape is fully consistent with observations, but the probability for future detection of spatial curvature is rather low, $P \sim 10^{-3}$.
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Robust non-minimal attractors in many-field inflation
For non-minimally coupled many-field inflation with at least one ξ ≫ 1, CMB observables match single-field predictions, with explicit large-N formulas for e-folds, Hubble scale, and turn rate.