In the latter '80s, inspired by reading of Hawkins' claims to unifying thermodynamics and electrodynamics at the event horizon of a black hole and black hole emissions involving the creation of virtual particle/anti-particle pairs, at least as I understood his work, I imagined a space ship drive that relied on a pair of constrained microscopic black holes that were so arranged that their spin axises were aligned and manipulated so that one emitted gravitrons along the axis to the rear and the other emitted anti-gravitrons along the axis to the front. This inspired me to survey the stars in our immediate vicinity, < 10 light years distant as possible destinations in a science fiction plot. I never took it further, but it is interesting to see others, with credentials, hypothesizing around the same postulates.

As the Dutch said while fighting the Spanish: "It is not necessary to have hope in order to persevere."