A gas of Poisson distributed primordial black holes (PBH) can induce at second order in cosmological perturbation theory a stochastic gravitational-wave (GW) background. This GW background can act as a novel method to extract constraints on cosmological models and gravitational theories. In this talk, we will discuss the above mentioned GW portal within the context of general relativity by...
Large and sharp turns in multifield inflation are attractive from the phenomenological point of view, but are difficult to obtain in supergravity. It can be shown that large and sharp turns can be naturally realised due to transient violations of slow-roll in axion monodromy inflation in SUGRA. In this setup, the scalar power spectrum can have a peaked profile with resonant oscillations at...
During this talk I will show how non-local terms in the linearized Einstein's equations are necessary to correctly describe the behaviour of gauge invariant quantities at superhorizon scales during inflation. Once this is clarified, I will explore how some approaches that aim to describe the large quantum fluctuations responsible for the formation of Primordial Black Holes (PBH) get affected...
