Quantum Theory and Local Causality by Gábor Hofer-Szabó & Péter Vecsernyés

Author:Gábor Hofer-Szabó & Péter Vecsernyés
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Fig. 4.1Bell’s (1975) first figure illustrating local causality

Fig. 4.2Bell’s (1975) second figure illustrating local causality

We comment on the terminology Bell is using in his definition below in detail. Here just note that in his screening-off condition (4.2) Bell takes into account the whole causal past of the events in question. He does not assume some kind of Markovity rendering superfluous of the remote past regions below a certain Cauchy surface. His second formulation of local causality can be regarded as a step towards this Markovian direction:The notion of local causality presented in this reference [namely in Bell (1975/2004)] involves complete specification of the beables in an infinite space-time region. The following conception is more attractive in this respect: In a locally-causal theory, probabilities attached to values of local beables in one space-time region, when values are specified for all local beables in a second space-time region fully obstructing the backward light cone of the first, are unaltered by specification of values of local beables in a third region with spacelike separation from the first two. (Bell 1986/2004, p. 200)

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