Speaker
Description
At the theoretical level, binary systems of evaporating primordial black holes (PBHs) are interesting situations in which the classical general relativistic dynamics related to the emission of gravitational waves (GWs), compete with the evolution driven by Hawking radiation. This competition is two-fold: first between the outspiralling dynamics produced by the loss of mass of the two bodies and its inspiralling counterpart due to GWs, leading to highly non-trivial orbital trajectories; second between spacetime excitations produced by GWs compared with those triggered by the Hawking emission of gravitons.
Even at the level of a Newtonian analysis, in two recent works in collaboration with A. Barrau, K. Martineau, C. Renevey, A. Liu and M. Lalhou – see https://arxiv.org/pdf/2306.09069.pdf and https://arxiv.org/pdf/2308.15117.pdf – we will show that surprising features arise, in particular three distinct regimes, depending on the initial conditions of the system, including an intricate non-monotonic behaviour. For these three possible scenarios, an exhaustive study of the evolution of GW and graviton frequencies, powers, and cumulative energies was performed.
At the phenomenological level, in the light of classifying and studying hypothetical sources of high-frequencies GWs, we put a specific emphasis on the study of the possible imprints – in terms of frequencies or strains – left by such systems.
