Causal loop
SEQUENCE OF EVENTS IN WHICH AN EVENT IS AMONG THE CAUSES OF ANOTHER EVENT, WHICH IN TURN IS AMONG THE CAUSES OF THE FIRST-MENTIONED EVENT
Causality loop; Causality Loop; Temporal causality loop; Causal loops; Creation paradox; Free lunch paradox; Ontological paradox; Bootstrap paradox; Bootstrap Paradox; Bootstrap paradox in fiction; Closed time loop; Predestination paradox; Law of Causality; Stable time loop
A causal loop is a theoretical proposition, wherein by means of either retrocausality or time travel, an event (an action, information, object, or person) is among the causes of another event, which is in turn among the causes of the first-mentioned event. Such causally looped events then exist in spacetime, but their origin cannot be determined.