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We investigate the two-stage inflation regime in the theory of hybrid cosmological α-
attractors. The spectrum of inflationary perturbations is compatible with the latest …

A bstract In this paper, we revisit the infrared (IR) divergences in de Sitter (dS) space using
the wavefunction method, and explicitly explore how the resummation of higher-order loops …

A bstract In our quest to understand the generation of cosmological perturbations, we face
two serious obstacles: we do not have direct information about the environment experienced …

We consider quantum diffusion in ultraslow-roll (USR) inflation. Using the Δ N formalism, we
present the first stochastic calculation of the probability distribution P (R) of the curvature …

We study the impact of stochastic noise on the generation of primordial black hole (PBH)
seeds in ultra-slow-roll (USR) inflation with numerical simulations. We consider the non …

A bstract We show that a scalar excited state with large occupation numbers during inflation
leads to an enhancement of tensor modes and a characteristic pattern of order-one …

Master equations are commonly employed in cosmology to model the effect of additional
degrees of freedom, treated as an “environment”, onto a given “system”. However, they rely …

We present a generic framework to compute the one-point statistics of cosmological
perturbations, when coarse-grained at an arbitrary scale R, in the presence of quantum …

A bstract Stochastic Inflation is an important framework for understanding the physics of de
Sitter space and the phenomenology of inflation. In the leading approximation, this approach …