The equivalence principle in classical mechanics and quantum mechanics
Mannheim, Philip D.
General Relativity and Quantum Cosmology
We discuss our understanding of the equivalence principle in both classical mechanics and quantum mechanics. We show that not only does the equivalence principle hold for the trajectories of quantum particles in a background gravitational field, but also that it is only because of this that the equivalence principle is even to be expected to hold for classical particles at all.