We derive analytic bounds on the shape of the primordial power spectrum in the context of
single-field inflation. In particular, the steepest possible growth has a spectral index of ns …

I review and discuss the possible implications for inflation resulting from considering new
physics in light of the Hubble tension. My study is motivated by a simple argument that the …

A bstract In our quest to understand the generation of cosmological perturbations, we face
two serious obstacles: we do not have direct information about the environment experienced …

We re-analyse current single-field inflationary models related to primordial black holes
formation. We do so by taking into account recent developments on the estimations of their …

We study the formation of primordial black holes and the generation of gravitational waves in
a class of cosmological models that are direct supersymmetric analogs of the …

In inflationary models that produce a spike of power on short scales, back-reaction of small-
scale substructure onto large-scale modes is enhanced. Loop corrections that quantify this …

Correlation functions of primordial density fluctuations provide an exciting probe of the
physics governing the earliest moments of our Universe. However, the standard approach to …

Recently multi-field inflation models that can produce large scalar fluctuations on small
scales have drawn a lot of attention, primarily because they could lead to primordial black …

We consider the steepest rate at which the power spectrum from single field inflation can
grow, with the aim of providing a simple explanation for the k 4 growth found recently. With …

Heavy scalar fields can undergo an instability during inflation as a result of their kinetic
couplings with the inflaton. This is known as the geometrical destabilization of inflation, as it …