In this paper, we review in detail different mechanisms of generation of large primordial
fluctuations and their implications for the production of primordial black holes (PBHs) and …

Stochastic inflation resolves primordial perturbations nonlinearly, probing their probability
distribution deep into its non-Gaussian tail. The strongest perturbations collapse into …

Quantum diffusion describes the inflow of vacuum quantum fluctuations as they get amplified
by gravitational instability, and stretched to large distances during inflation. In this picture …

We present a study of the Effective Field Theory (EFT) generalization of stochastic inflation in
a model-independent single-field framework and its impact on primordial black hole (PBH) …

In this work we terminate inflation during a phase of Constant Roll by means of a waterfall
field coupled to the inflaton and a spectator field. The presence of a spectator field means …

We develop a C++ package of the STOchastic LAttice Simulation (STOLAS) of cosmic
inflation. It performs the numerical lattice simulation in the application of the stochastic …

This thesis is dedicated to the study of stochastic processes; non-deterministic physical
phenomena that can be well described by classical physics. The stochastic processes we …