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The British Journal for the Philosophy of Science Advance Access originally published online on October 18, 2005
The British Journal for the Philosophy of Science 2005 56(4):663-680; doi:10.1093/bjps/axi140
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© The Author (2005). Published by Oxford University Press on behalf of British Society for the Philosophy of Science. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Minimal Assumption Derivation of a Bell-type Inequality

Gerd Graßhoff

History and Philosophy of Science, Exact Sciences, Sidlerstrasse 5, University of Bern, CH-3012 Bern, Switzerland gerd.grasshoff{at}philo.unibe.ch

Samuel Portmann and Adrian Wüthrich

Institute of Theoretical Physics, Exact Sciences Sidlerstrasse 5, University of Bern, CH-3012 Bern Switzerland portmann{at}itp.unibe.ch awuethr{at}itp.unibe.ch

John Bell showed that a big class of local hidden-variable models stands in conflict with quantum mechanics and experiment. Recently, there were suggestions that empirically adequate hidden-variable models might exist which presuppose a weaker notion of local causality. We will show that a Bell-type inequality can be derived also from these weaker assumptions.

  1. Introduction
  2. The EPR-Bohm experiment
  3. Local causality
  4. Bell's inequality from separate common causes
    4.1 A weak screening-off principle
    4.2 Perfect correlation and ‘determinism’
    4.3 A minimal theory for spins
    4.4 No conspiracy

  5. Discussion


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