The equivalence of local-realistic and no-signalling theories

Abstract

We provide a framework that describe all local-realistic theories and all no-signalling theories. We show that every local-realistic theory is a no-signalling theory. We also show that every no-signalling theory with invertible dynamics has a local-realistic model. This applies in particular to unitary quantum theory.

62 pages. No changes in the conclusion, but changes in authors explained on the title page footnote. Additionally, the paper was massively reworked to improve the presentation of the ideas and all the appendices are new