It is commonly assumed that the energy density of the Universe was dominated by radiation
between reheating after inflation and the onset of matter domination 54,000 years later …

Given the proliferation of bouncing models in recent years, we gather and critically assess
these proposals in a comprehensive review. The PLANCK data shows an unmistakably red …

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Ultra-light primordial black holes, with masses m PBH< 10 9 g, evaporate before big-bang
nucleosynthesis and can therefore not be directly constrained. They can however be so …

The gravitational potential of initially Poisson distributed primordial black holes (PBH) can
induce a stochastic gravitational-wave background (SGWB) at second order in cosmological …

In this Letter, we derive for the first time a characteristic three-peaked GW signal within the
framework of no-scale Supergravity, being the low-energy limit of Superstring theory. We …

We study the comoving curvature perturbation R in the single-field inflation models whose
potential can be approximated by a piecewise quadratic potential V (φ) by using the δ N …

Primordial black holes may have formed in the radiative era of the early Universe from the
collapse of large enough amplitude perturbations of the metric. These correspond to non …

The curvature perturbations produced during an early era of inflation are known to have
quasi-Gaussian distribution functions close to their maximum, where they are well …

We consider the effect of quantum diffusion on the dynamics of the inflaton during a period of
ultra-slow-roll inflation. We extend the stochastic-δ Script N formalism to the ultra-slow-roll …