Doubly peaked induced stochastic gravitational wave background : Testing
  baryogenesis from primordial black holes
  Hawking evaporation of primordial black holes (PBHs) can facilitate the
generation of matter-antimatter asymmetry. We focus on ultra-low mass PBHs that
briefly dominate the expansion of the universe and evaporate before the big
bang nucleosynthesis. We propose a novel test of this scenario through the
detection of its characteristic doubly peaked gravitational wave (GW) spectrum
in future GW observatories. Here the first order adiabatic scalar perturbations
from inflation and the isocurvature perturbations from PBH distribution source
the second-order tensor perturbations leading to two peaks in induced GW
background. These two resonant peaks in the induced GW background are generated
at the beginning of standard RD in the presence of a prior PBH-dominated era.
This unique GW spectral shape provides a smoking gun signal of non-thermal
baryogenesis from evaporating PBHs, which is otherwise impossible to test in
laboratory experiments due to the very high energy scales involved, or the
feeble interaction of the dark sector with the visible sector.
