Subjunctive Realism

Abstract

I examine a metaphysical theory which accounts for the indeterminism of which quantum mechanics is both cause and symptom. This theory, which I call subjunctive realism, is based on a many-worlds interpretation of quantum mechanics, where the multiple possible results of observations describe branching states of the object system. Our universe is but one branch of a larger “multiverse”: quantum-mechanical observations provide information regarding the area of the multiverse where the observer is located. An account of personal identity which can cope with the demands of the theory is also provided, along with an exploration of some ramifications of the theory for questions regarding quantum theory and personal identity.