Intersubjective Gravity and Entanglement

Abstract

Although quantum theory and relativity are two of the monumental achievements in modern physics, their exact relationship remains somewhat uncertain. Indeed, while the nature of quantum theory is subjective at the fundamental level, relativity involves a rule that is invariant under observers’ different reference frames. This paper argues that quantum theory and relativity are connected in such a way that Alice’s and Bob’s choices of coordinate bases, which correspond to the apparatus outcome in quantum measurement, are related to Einstein’s field equation. That is, the phenomenon of gravity corresponds to a commonality among observers, thereby involving an intersubjective aspect, rather than being objective. This shared feature of intersubjectivity is also discussed in terms of entanglement and locality.