Backward causation and the Stalnaker-Lewis approach to counterfactuals

Whether backward causation is logically possible is a deeply controversial matter, and one on which, in the present paper, I shall take no stand. The question to be considered is what relation, if any, there is between the logical possibility of backward causation and a Stalnaker-Lewis-style account of the truth conditions of counterfactuals, and the thesis that I shall be defending is that, if backward causation is logically possible, then a Stalnaker-Lewis-style account of the truth conditions of counterfactuals cannot be sound. 1. Counterfactuals and similarity relations over possible worlds