  We analyze the prospects for using gravitational waves produced in early
universe phase transitions as a complementary probe of the flavor anomalies in
B meson decays. We focus on the Left-Right SU(4) Model, for which the strength
of the observed lepton universality violation and consistency with other
experiments impose a vast hierarchy between the symmetry breaking scales. This
leads to a multipeaked gravitational wave signature within the reach of
upcoming gravitational wave detectors.
