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Causality is the relationship between causes and effects. [1] [2] While causality is also a topic studied from the perspectives of philosophy and physics, it is operationalized so that causes of an event must be in the past light cone of the event and ultimately reducible to fundamental interactions. Similarly, a cause cannot have an effect ...
Causality is not inherently implied in equations of motion, but postulated as an additional constraint that needs to be satisfied (i.e. a cause always precedes its effect). This constraint has mathematical implications [45] such as the Kramers-Kronig relations. Causality is one of the most fundamental and essential notions of physics. [46]
Physics involving special relativity or general relativity require more careful definitions of causality, as described elaborately in Causality (physics). The causality of systems also plays an important role in digital signal processing, where filters are constructed so that they are causal, sometimes by altering a non-causal formulation to ...
Bell described the assumptions behind his work as "local causality", shortened to "locality"; later authors referred to the assumptions as local realism. [10] These different names do not alter the mathematical assumptions. A review of papers [11] using this phrase suggests that a common (classical) physics definition of realism is
Retrocausality, or backwards causation, is a concept of cause and effect in which an effect precedes its cause in time and so a later event affects an earlier one. [1] [2] In quantum physics, the distinction between cause and effect is not made at the most fundamental level and so time-symmetric systems can be viewed as causal or retrocausal.
Because signals and other causal influences cannot travel faster than light (see special relativity), the light cone plays an essential role in defining the concept of causality: for a given event E, the set of events that lie on or inside the past light cone of E would also be the set of all events that could send a signal that would have time ...
Whether you can't seem to stay away from the taste of sprite, or you resort to a can of coke for a midday pick-me-up -- you know what it's like to enjoy the sweet taste of soda throughout the day.
The causality violating set is the set of points through which closed causal curves pass. The boundary of the causality violating set is a Cauchy horizon . If the Cauchy horizon is generated by closed null geodesics, then there's a redshift factor associated with each of them.