Gravitational waves probe of spacetime quantumness

• Saeed Rastgoo (University of Alberta, LISA)

In many quantum gravitational models of the universe, spacetime is quantized. However, to ultimately prove that this is actually the case, we need to observe its consequences experimentally. In this work I present a model of nonperturbatively quantized gravitational waves, i.e., spacetime perturbation, inspired by loop quantum gravity, which is a nonperturbative theory of quantum spacetime. I then show how one can attempt at detecting signatures of discreteness of spacetime through the study of these gravitational waves, particularly their waveform and speed of propagation.