Antonio Riotto

TL;DR: In this paper, the angular anisotropies of the GW energy density were studied using a Boltzmann approach, which is an important tool to disentangle the different cosmological and astrophysical contributions to the SGWB.

TL;DR: In this paper, the authors show that thermal leptogenesis through the decays of the next-to-lightest right-handed neutrinos encounters serious difficulties when SO (10 ) -inspired mass conditions are imposed on the Dirac neutrino mass matrix and light neutrini masses are generated through the type I see-saw mechanism.

TL;DR: In this paper, the authors show that even a tiny attractive interaction among ultralight axions can have a significant impact on the stability of cosmic structures at low redshift, and they also show that the axion self-interaction is attractive and therefore could counteract the quantum pressure induced by the strong delocalization of the particles.

TL;DR: In this article, the authors consider the constraints on the fraction of dark matter in the universe in the form of primordial black holes taking into account the crucial role of accretion which may change both their mass and mass function.

TL;DR: In this paper, the evolution of cosmological perturbations on large scales, up to second order, for a perfect fluid with generic equation of state was studied, and it was shown that a large nonlinearity is generated by the gravitational dynamics from the original inflationary quantum fluctuations.