Bell's Theorem and the Causal Arrow of Time

Understand

Einstein held that the formalism of Quantum Mechanics (QM) entails "spooky actions at a distance".

• Indeed, in the 60's Bell showed that the predictions of QM disagree with the results of any locally causal description.
• Accepting non-local descriptions while retaining causality leads to a clash with the theory of relativity.
• Furthermore, the causal arrow of time by definition contradicts time-reversal symmetry.