Key points are not available for this paper at this time.
The pair creation of black holes with event horizons of non-trivial topology is described. The spacetimes are all limiting cases of the cosmological C metric. They are generalizations of the (2+1) dimensional black hole and have asymptotically anti de Sitter behaviour. Domain walls instantons can mediate their pair creation for a wide range of mass and charge.
Robert B. Mann (Thu,) studied this question.