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University of Cambridge > Talks.cam > CQIF Seminar > Causality, Bell's Theorem and Ontic Definiteness

## Causality, Bell's Theorem and Ontic DefinitenessAdd to your list(s) Download to your calendar using vCal - Joe Henson (Perimeter Institute)
- Thursday 18 November 2010, 14:15-15:15
- MR4, Centre for Mathematical Sciences.
If you have a question about this talk, please contact Ashley Montanaro. Bell’s theorem shows that the reasonable relativistic causal principle known as “local causality” is not compatible with the predictions of quantum mechanics. As will be argued in the talk, it is impossible to maintain a satisfying causal principle of this type while dropping any of the better-known assumptions of Bell’s theorem. However, another (seldom challenged) assumption of Bell’s theorem is the use of classical logic. One part of this assumption is the principle of ontic definiteness, that is, that it must in principle be possible to assign definite truth values to all propositions treated in the theory. In this talk it will be shown that, once the logical setting is clarified somewhat, rejecting this principle does not in any way undermine the type of causal principle used by Bell. Without ontic definiteness, the deterministic causal condition known as Einstein Locality succeeds in banning superluminal influence (including signalling) whilst allowing correlations that violate Bell’s inequalities. Objections to altering logic, and the consequences for operational and realistic viewpoints, will be discussed. This talk is part of the CQIF Seminar series. ## This talk is included in these lists:- All CMS events
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