Quantum superposition of spacetimes obeys Einstein's equivalence principle

We challenge the view that there is a basic conflict between fundamental principles of Quantum Theory and General Relativity and, in particular, fact superposition massive bodies would lead to violation Equivalence Principle. It has been argued this implies such must inevitably spontaneously collapse (like Diósi–Penrose model). identify origin an assertion impossibility finding local classical reference frame which Einstein's Principle hold. In contrast, we argue formulation can be generalized so it holds for frames are associated with quantum systems spacetimes. The core new introduction diffeomorphism Reference Frames. This procedure reconciles principle linear general covariance Relativity. Hence, not necessary invoke gravity-induced spontaneous state reduction when body prepared spatial superposition.