Cosmic inflation provides a window to the highest energy densities accessible in nature, far
beyond those achievable in any realistic terrestrial experiment. Theoretical insights into the …

The inflationary origin of primordial black holes (PBHs) relies on a large enhancement of the
power spectrum Δ ζ of the curvature fluctuation ζ at wavelengths much shorter than those of …

A bstract We show that a scalar excited state with large occupation numbers during inflation
leads to an enhancement of tensor modes and a characteristic pattern of order-one …

We study the effects of a massive field with a continuous spectrum (continuum isocurvaton)
on the inflationary bispectrum in the squeezed limit. As a concrete example, we extend the …

Stochastic inflation is an effective theory describing the super-Hubble, coarse-grained,
scalar fields driving inflation, by a set of Langevin equations. We previously highlighted the …

A bstract It is becoming increasingly clear that large but rare fluctuations of the primordial
curvature field, controlled by the tail of its probability distribution, could have dramatic effects …

A bstract Recent studies of inflation with multiple scalar fields have highlighted the
importance of non-canonical kinetic terms in novel types of inflationary solutions. This …

A bstract Massive fields can imprint unique oscillatory features on primordial correlation
functions or inflationary correlators, which is dubbed the cosmological collider signal. In this …

A bstract We study effects of multiple scalar fields (scalar isocurvatons) with the Hubble
scale masses on the inflationary bispectrum in the squeezed limit, particular paying attention …

In this article, we study in detail the linear dynamics and cubic interactions for any number N
field of scalar fields during inflation, directly in terms of the observable curvature perturbation …