Branching Space-Time, Modal Logic and the Counterfactual Conditional

Abstract

The paper gives a physicist's view on the framework of branching space-time. Branching models are constructed from physical state assignments. The models are then employed to give a formal semantics for the modal operators "possibly" and "necessarily" and for the counterfactual conditional. The resulting formal language can be used to analyze quantum correlation experiments. As an application sketch, Stapp's premises LOC1 and LOC2 from his purported proof of nonlocality are analyzed. (edited)