Speaker
Description
We explore the possibility of dynamically producing the observed matter-antimatter asymmetry of the Universe entirely from the evaporation of primordial black holes (PBH), that are formed in an inflaton-dominated
background. Considering the inflaton $(\phi)$ to oscillate in a monomial
potential $V(\phi)\propto\phi^n$, we show that it is possible to obtain
the desired baryon asymmetry via vanilla leptogenesis from evaporating
PBHs of initial mass $\lesssim 10$ g. The feasible parameter space is
heavily dependent on the shape of the inflaton potential during reheating
(determined by $n$), the energy density of PBHs (determined by
$\beta$), and the nature of the coupling between the inflaton and the
Standard Model (SM). We further include in our analysis the minimal
gravitational leptogenesis set-up through inflaton scattering via a graviton, that opens up an even larger window for PBH mass, depending on the background equation of state. We finally show that such gravitational leptogenesis scenarios can be tested with upcoming gravitational wave (GW) detectors, courtesy of the blue-tilted primordial GW with inflationary origin, thus paving a way to probe a PBH-induced reheating and leptogenesis era.
