Most interpretations of quantum mechanics treat the wavefunction as a mathematical tool to predict probabilities. Kastner argues for something much bolder: . She suggests that quantum states are physically real "possibilities" that exist in a multi-dimensional realm outside of our four-dimensional spacetime.
Whether you're a student of the philosophy of physics or just someone who lies awake wondering what's actually happening during a quantum measurement, Ruth E. Kastner's is essential reading. What is the "Reality of Possibility"?
In this view, the "collapse" of the wavefunction isn't a mysterious observer-induced event, but a physical "handshake" between an emitter and an absorber. Key Themes & Chapter Highlights