The Quantum Wave Function as a Complex Probability Distribution

This paper suggests an interpretation for the wave function, based on some elements of Nelson's stochastic mechanics, the time-symmetric laws of quantum theory and complex probabilities. Our main purpose is to demonstrate that the wave function and its complex conjugate can be interpreted as complex probability densities (or quasi-probability distributions) related to non-real forward and backward in time stochastic motion respectively. Those two quasi-Brownian motions serve as mathematical abstracts in order to derive the Born rule using probability theory and the intersection of the two probability sets that describe each of those motions. This proposal is useful also for explaining more about the role of complex numbers in quantum mechanics that produces this so-called "wave-like" nature of quantum reality. Our perspective also challenges the notion of physical superposition which is a fundamental concept in the Copenhagen interpretation and some other interpretations of quantum theory. Moreover, it is suggested that, embracing the idea of stochastic processes in quantum theory, may explain the reasons for the appearance of classical behavior in large objects, in contrast to the quantum behavior of small ones. In other words, we claim that a combination of a probabilistic and no-ontic view of the wave function with a stochastic hidden-variables approach, like Nelson's and others', may provide some insight into the quantum physical reality and potentially establish the groundwork for a novel interpretation of quantum mechanics.