Antonio Riotto

TL;DR: It is shown that such a signal can be explained by second-order gravitational waves produced during the formation of primordial black holes from the collapse of sizeable scalar perturbations generated during inflation.

TL;DR: In this article, the expansion rate of an inhomogeneous universe is calculated to second order in perturbation variables and the mean and variance of the correction on the scale of the Hubble radius is shown to be sensitive to the physical significance of the unknown spectrum of density perturbations.

TL;DR: In this paper, it was shown that a possible signature of the Standard Model Higgs instability is the production of gravitational waves sourced by Higgs fluctuations generated during inflation, and the two-point correlator of such gravitational waves by computing its amplitude, the frequency at peak, the spectral index, as well as their three point correlators for various polarisations.

TL;DR: In this article, the authors show that the short observation time and propagation effects of the GWs across the perturbed Universe from the production point to the LISA detector suppress the bispectrum to an unobservable level.

TL;DR: The final report of the ATLAS-CMS Dark Matter Forum, a forum organized by ATLAS and CMS collaborations with the participation of experts on theories of dark matter, to select a minimal basis set of simplified models that should support the design of the early LHC Run-2 searches is presented in this paper.