In the recent years, primordial black holes (PBHs) have emerged as one of the most
interesting and hotly debated topics in cosmology. Among other possibilities, PBHs could …

Pulsar timing arrays gathered evidence of the presence of a gravitational wave background
around nHz frequencies. If the gravitational wave background was induced by large and …

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 improve and generalize the non-minimal curvaton model originally proposed in arxiv:
2112.12680 to a model in which a spectator field non-minimally couples to an inflaton field …

We propose a new model-independent mechanism for producing primordial black holes
from a period of multi-field inflation. This requires an enhancement of primordial fluctuations …

We study the power spectrum of the comoving curvature perturbation Script R in the model
that glues two linear potentials of different slopes, originally proposed by Starobinsky. We …

Cosmological α-attractors stand out as particularly compelling models to describe inflation in
the very early universe, naturally meeting tight observational bounds from cosmic microwave …

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 …

Primordial black holes (PBHs) are supposed to form through the gravitational collapse of
regions with large density fluctuations. The formation of PBHs inevitably leads to the …

We calculate the scalar-induced gravitational wave energy density in the theory of ghost
inflation, assuming scale invariance and taking into account both the power spectrum-and …