Title: Causality (physics) - Wikipedia
Headings: Causality (physics)
Causality (physics)
Contents
As a physical concept
Determinism (or, what causality is not)
Distributed causality
Causal dynamical triangulation
Causal sets
See also
References
Further reading
External links

Content: In the theory of general relativity, the concept of causality is generalized in the most straightforward way: the effect must belong to the future light cone of its cause, even if the spacetime is curved. New subtleties must be taken into account when we investigate causality in quantum mechanics and relativistic quantum field theory in particular. In quantum field theory, causality is closely related to the principle of locality. However, the principle of locality is disputed: whether it strictly holds depends on the interpretation of quantum mechanics chosen, especially for experiments involving quantum entanglement that satisfy Bell's Theorem . Despite these subtleties, causality remains an important and valid concept in physical theories. For example, the notion that events can be ordered into causes and effects is necessary to prevent (or at least outline) causality paradoxes such as the grandfather paradox, which asks what happens if a time-traveler kills his own grandfather before he ever meets the time-traveler's grandmother. See also Chronology protection conjecture . Determinism (or, what causality is not)
The word causality in this context means that all effects must have specific physical causes due to fundamental interactions.