On Bell's local causality in local classical and quantum theory - a podcast by MCMP Team

Gábor Hofer-Szabó (Budapest) gives a talk at the MCMP Colloquium (9 April, 2014) titled "On Bell's local causality in local classical and quantum theory". Abstract: This paper aims to give a clear-cut definition of Bell's notion of local causality. Having provided a framework, called local physical theory, which integrates probabilistic and spatiotemporal concepts, we formulate the notion of local causality and relate it to other locality and causality concepts. Then we compare Bell's local causality with Reichenbach's Common Cause Principle and relate both to the Bell inequalities. We find a nice parallelism: both local causality and the Common Cause Principle are more general notions than captured by the Bell inequalities. Namely, Bell inequalities cannot be derived neither from local causality nor from a common cause unless the local physical theory is classical or the common cause is commuting, respectively.

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