Speaker
Description
Scalar-induced Gravitational Waves (SIGWs) represent a powerful way to probe the early-Universe. Their production is strongly affected by the evolution of the Universe as well as by the presence of primordial non-Gaussianity. In this talk I will discuss the imprints of different equation of state $w$ and speed of sound $c_s^2$ on the SIGW signal as well as the capability of LISA to constrain these different parameters accounting also for the presence of primordial non-Gaussianity.
Additionally, in the specific case of a radiation dominated Universe, by analysing the interplay between Primordial Black Holes (PBHs) and SIGWs, I will show that uncertainties due to non-Gaussianity can induce substantial uncertainties in the PBH abundance, limiting LISA's capacity to fully probe the asteroid-mass PBH DM window.