4 papers
Biased Domain Wall Networks and their Gravitational Waves
Davide Barbini, Alessio Notari, Oriol Pujolàs +2
Cosmic Domain Wall networks are among the most interesting sources of a stochastic Gravitational Wave (GW) background from the early Universe. We present a thorough analysis of the…
The Spectrum of Gravitational Waves from Annihilating Domain Walls
Alessio Notari, Fabrizio Rompineve, Francisco Torrenti
Networks of cosmic domain walls can form in the early Universe as a consequence of the spontaneous breaking of discrete symmetries. We study the production of a cosmological backgr…
Stupendously Large Primordial Black Holes from the QCD axion
Miguel Faria, Ricardo Z. Ferreira, Fabrizio Rompineve
The inflationary diffusion of (pseudo-)scalar fields with discrete symmetries can seed the formation of a gas of closed domain walls after inflation, when the distance between dege…
Reduced Hubble Tension in Dark Radiation Models after DESI 2024
Itamar J. Allali, Alessio Notari, Fabrizio Rompineve
We investigate the presence of extra relativistic degrees of freedom in the early Universe, contributing to the effective number of neutrinos , as $ÎN_\text{eff}\equ…