Weak Bisimulations for the Giry Monad (Extended Abstract)

The existence of bisimulations for objects in the Kleisli category associated with the Giry monad of subprobabilities over Polish spaces is studied. We first investigate these morphisms and show that the problem can be reduced to the existence of bisimulations for objects in the base category of stochastic relations using simulation equivalent congruences. This leads to a criterion for two objects related through the monad to be bisimilar.