  In this article we investigate the cumulative stochastic gravitational wave
spectra as a tool to gain insight on the creation mechanism of primordial black
holes. We consider gravitational waves from the production mechanism of
primordial black holes and from the gravitational interactions of those
primordial black holes among themselves and other astrophysical black holes. We
specifically focus on asynchronous bubble nucleation during a first order phase
transition as the creation mechanism. We have used two benchmark phase
transitions through which the primordial black holes and the primary
gravitational wave spectra have been generated. We have considered binary
systems and close hyperbolic interactions of primordial black holes with other
primordial and astrophysical black holes as the source of the secondary part of
the spectra. We have shown that this unique cumulative spectra have features
which directly and indirectly depend on the specifics of the production
mechanism.
