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In physics, nonlocality or action at a distance is the direct interaction of two objects that are separated in space with no perceivable intermediate agency or mechanism. Regarding the unexplained nature of gravity, Isaac Newton (1642–1727) considered action-at-a-distance "so great an Absurdity that I believe no Man who has in philosophical Matters a competent Faculty of thinking can ever fall into it". Quantum nonlocality refers to what Einstein called the "spooky action at a distance" of quantum entanglement.
Nonlocality may also refer to:
- Nonlocal Aharonov–Bohm effect, a quantum mechanical phenomenon in which an electrically charged particle is affected by an electromagnetic field, despite the fact that the field is zero in the region concerned
- Nonlocal Lagrangian, a Lagrangian that contains terms that are nonlocal in the fields
- Nonlocal generalisation of the Londons' equation due to Pippard
- Hypotheses non fingo
- Principle of locality
- Relative locality
- Wheeler–Feynman absorber theory
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