The computation of the primordial power spectrum in multi-field inflation models requires us
to correctly account for all relevant interactions between adiabatic and non-adiabatic modes …

We compute the low energy effective field theory (EFT) expansion for singlefield inflationary
models that descend from a parent theory containing multiple other scalar fields. By …

We discuss and clarify the validity of effective single-field theories of inflation obtained by
integrating out heavy degrees of freedom in the regime where adiabatic perturbations …

We study models of inflation with two scalar fields and non-canonical kinetic terms, focusing
on the case in which the curvature and isocurvature perturbations are strongly coupled to …

We study the dynamics of two-field models of inflation characterized by a hierarchy of
masses between curvature and isocurvature modes. When the hierarchy is large, a low …

We study a particular version of the theory of cosmological α-attractors with α= 1/3, in which
both the dilaton (inflaton) field and the axion field are light during inflation. The kinetic terms …

A bstract We investigate how super-Planckian axions can arise when type IIB 3-form flux is
used to restrict a two-axion field space to a one-dimensional winding trajectory. If one does …

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 …

In multi-field inflation one or more non-adiabatic modes may become light, potentially
inducing large levels of isocurvature perturbations in the cosmic microwave background. If in …

In this paper, we show how the structure of the landscape potential of the primordial
Universe may be probed through the properties of the primordial density perturbations …