Binary neutron star mergers as the source of the highest energy cosmic rays

We propose that ultrahigh energy cosmic rays are produced in binary neutron star mergers. Interpreting the highest energy events as r-process nuclei eliminates the need for exotic sources, while the observed near-universal maximum rigidity of ultrahigh energy sources can be understood as due to the uniformity of jets generated by the gravitationally-driven dynamo, given the narrow range of total binary neutron star masses. We discuss evidence for this scenario, and its prediction of coincidences between neutrinos above 10 PeV and gravitational waves.