We review conceptual aspects of inflationary scenarios able to produce primordial black
holes by amplifying the size of curvature fluctuations to the level required to trigger black …

Several pulsar timing arrays including NANOGrav, EPTA, PPTA, and CPTA have recently
reported the observation of a stochastic background of gravitational wave spectrum in the …

A bstract A new era of exploring the early Universe may have begun with the recent strong
evidence for the stochastic gravitational wave (GW) background from the data reported by …

We study the nonlinear dynamics of axion inflation, capturing for the first time the
inhomogeneity and full dynamical range during strong backreaction, till the end of inflation …

The coupling between a pseudo-scalar inflaton and a gauge field leads to an amount of
additional density perturbations and gravitational waves (GWs) that is strongly sensitive to …

A bstract We consider the evolution of quantum fields during inflation, and show that the total-
energy singularities appearing in the perturbative expansion of the late-time Wavefunction of …

A bstract Axion inflation coupled to Abelian gauge fields via a Chern-Simons-like term of the
form\(\phi F\overset {\sim}{F}\) represents an attractive inflationary model with a rich …

For the first time, we investigate the nonperturbative dynamics of single field inflation with a
departure from slow roll. Using simulations, we find that oscillatory features in the potential …

We extend the reach of the" cosmological collider" for massive gauge boson production
during inflation from the CMB scales to the interferometer scales. Considering a Chern …

We perform an analytical study of the stability of the background solution [1] of the model in
which an inflaton, through an axionic coupling to a U (1) gauge field, causes an amplification …