Some of the most important quintessential inflation scenarios, such as the Peebles–Vilenkin
model, are described in detail. These models are able to explain the early-and late-time …

In this contribution, we discuss the asymptotic safety scenario for quantum gravity with a
functional renormalization group approach that disentangles dynamical metric fluctuations …

I review and discuss the possible implications for inflation resulting from considering new
physics in light of the Hubble tension. My study is motivated by a simple argument that the …

Reheating is a transition era after the end of inflation, during which the inflaton is converted
into the particles that populate the Universe at later times. No direct cosmological …

Quantum fluctuations and density perturbations Universe or multiverse? Eternal inflation
Initial conditions for low-scale inflation Inflation and observations Chaotic inflation in …

We introduce a novel nonminimal coupling between gravity and the inflaton sector.
Remarkably, for large values of this coupling all models asymptote to a universal attractor …

In the context of $ f (R)= R+\alpha R^{2} $ gravity, we study the existence of neutron and
quark stars for various α with no intermediate approximation in the system of equations …

In light of the most recent cosmological observations, we provide new updated constraints
on the slow roll inflation in different extended scenarios beyond the Λ CDM cosmological …

A bstract We look for signals of critical behavior in the Yukawa sector. By reviewing a set of
models for the fermion masses, we select those where a symmetry-breaking order …

The cosmic microwave background (CMB) temperature and polarization anisotropies, as
observed by independent astronomical missions such as WMAP, Planck, and most recently …