On modifications of Reichenbach's principle of common cause in light of Bell's theorem

Understand

Bell's 1964 theorem causes a severe problem for the notion that correlations require explanation, encapsulated in Reichenbach's Principle of Common Cause.

• Despite being a hallmark of scientific thought, dropping the principle has been widely regarded as a much less bitter medicine than the perceived alternative---dropping relativistic causality.
• Recently, however, some authors have proposed that modified forms of Reichenbach's principle could be maintained even with relativistic causality.
• Here we break down Reichenbach's principle into two independent assumptions---the Principle of Common Cause proper, and Factorisation of Probabilities.