Some exact non-vacuum Bianchi VI0 and VII0 instantons

We report some new exact instantons in general relativity, describing their relevance to cosmology. These solutions are Kahler and fall into the symme try classes of Bianchi types VI0 and VII0, with the matter content of a sti ff fluid. The qualitative behaviour of the solutions is presented, and we c ompare it to the known results of the corresponding self-dual Bianchi solut ions. We also give axisymmetric Bianchi VII0 solutions with an electromagne tic field.