The Quantum Mechanical Path Integral: toward a Realistic Interpretation

In this paper, I explore the feasibility of a realistic interpretation of the quantum mechanical path integral — that is, an interpretation according to which the particle actually follows the paths that contribute to the integral. I argue that an interpretation of this sort requires spacetime to have a branching structure similar to the structures of the branching spacetimes proposed by previous authors. I point out one possible way to construct branching spacetimes of the required sort, and I ask whether the resulting interpretation of quantum mechanics is empirically testable.