Local causality in the works of Einstein, Bohm and Bell

Abstract

In this chapter we discuss the Einstein Podolsky Rosen theorem and its strong relation with Bell's theorem. The central role played by the concept of beable introduced by Bell is emphasized. In particular we stress that beables involved in EPR and Bell theorems are not limited to hidden supplementary variables (e.g., like in the de Broglie-Bohm (dBB) pilot-wave theory) but also include the wave function. In full agreement with Bell this allows us the reformulate the EPR and Bell results as strong theorems concerning nonlocality for quantum mechanics itself and not only for hidden-variables approaches as it is often mistakenly assumed. Furthermore, we clarify some repeated ambiguities concerning `local-realism' and emphasize that neither realism nor determinism nor counterfactual definiteness are prerequisites of EPR and Bell theorems.