|Look up nonlocality in Wiktionary, the free dictionary.|
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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