We revisit the one-loop correction in curvature perturbation power spectrum in models of
single field inflation which undergo a phase of ultra slow-roll (USR) inflation. We include the …

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 …

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 …

We examine the possibility of Primordial Black Holes (PBHs) formation in single field models
of inflation. Using the adiabatic or wave function renormalization scheme in the short range …

The understanding of the primordial mechanism that seeded the cosmic structures we
observe today in the sky is one of the major goals in cosmology. The leading paradigm for …

The stochastic gravitational wave background (SGWB) detected recently by the pulsar timing
arrays (PTAs) observations may have cosmological origins. In this work we consider a …

For primordial perturbations, deviations from Gaussian statistics on the tail of the probability
distribution can be associated with non-perturbative effects of inflation. In this paper, we …

The observation of primordial correlators by cosmological surveys is a very promising
avenue to probe high energies and the perturbative regime of quantum gravity. Hence, it is …

The formation and abundance of primordial black holes (PBHs) arising from the curvature
perturbation ζ is studied. The non-linear relation between ζ and the density contrast δ means …

Primordial black holes (PBHs) can be formed from the collapse of large-amplitude
perturbation on small scales in the early universe. Such an enhanced spectrum can be …