We revisit a two-component inflaton model with a turning trajectory in the field space, where
the field slowly rolls down along the trajectory. We consider the case when the effective …

We present a scenario of vector dark matter production from symmetry breaking at the end of
inflation. In this model, the accumulated energy density associated with the quantum …

We describe models of single-field inflation with small and sharp step features in the
potential (and sound speed) of the inflaton field, in the context of the Effective Field Theory of …

The decay of massive particles during inflation generates characteristic signals in the
squeezed limit of the primordial bispectrum. These signals are in particular distinctive in the …

Classically oscillating massive fields can be used as``standard clocks''in the primordial
universe. They generate features in primordial density perturbations that directly record the …

Thanks to tremendous progresses in observational cosmology during about past two
decades, see eg Refs.[1–7], the theory of primordial inflation has become a widely accepted …

We study primordial anisotropies generated in the model of gauged hybrid inflation in which
the complex waterfall field is charged under a U (1) gauge field. Primordial anisotropies are …

We investigate the possibility that a heavy scalar field, whose mass exceeds the Hubble
scale during inflation, could leave non-negligible signatures in the Cosmic Microwave …

We discuss the possibility that we could obtain some hints of the heavy physics during
inflation by analyzing local features of the primordial bispectrum. A heavy scalar field could …

We consider the perturbative consistency of inflationary models with features with effective
field theory methods. By estimating the size of one-loop contributions to the three-point …