Abstract The standard Λ Cold Dark Matter (ΛCDM) cosmological model provides a good
description of a wide range of astrophysical and cosmological data. However, there are a …

It is commonly assumed that the energy density of the Universe was dominated by radiation
between reheating after inflation and the onset of matter domination 54,000 years later …

Deep space observations of the JWST have revealed that the structure and masses of very
early Universe galaxies at high redshifts (), existing at 0.3 Gyr after the Big Bang, may be as …

Abstract We present new Big Bang Nucleosynthesis (BBN) limits on the cosmic expansion
rate or relativistic energy density, quantified via the number N ν of equivalent neutrino …

Precision measurements of the number of effective relativistic neutrino species and the
primordial element abundances require accurate theoretical predictions for early Universe …

Local H_0 determinations currently fall in a window between H 0∼ 70 km/s/Mpc (TRGB) and
H 0∼ 76 km/s/Mpc (Tully-Fisher). In contrast, BAO data calibrated in an early ΛCDM …

We present a model of early modified gravity (EMG) consisting in a scalar field σ with a
nonminimal coupling to the Ricci curvature of the type M pl 2+ ξ σ 2 plus a cosmological …

A bstract Ultra-low mass primordial black holes (PBH), which may briefly dominate the
energy density of the universe but completely evaporate before the big bang …

In this work we present PRyMordial: A package dedicated to efficient computations of
observables in the Early Universe with the focus on the cosmological era of Big Bang …

We calculate the motion of binary mass systems in gravity up to the fourth post–Newtonian
order. We use momentum expansions within an effective field theory approach based on …