Editing Causality (physics) (section)

{{Short description|Physics of the cause–effect relation}}
{{About|the physical definition of "causality"|causality in general|Causality}}
{{other uses of|Causation}}
{{Refimprove|date=July 2008}}
'''Causality''' is the relationship between causes and effects.<ref>Green, Celia (2003). ''The Lost Cause: Causation and the Mind–Body Problem''. Oxford: Oxford Forum. {{ISBN|0-9536772-1-4}}. Includes three chapters on causality at the microlevel in physics.</ref><ref>Bunge, Mario (1959). ''Causality: the place of the causal principle in modern science''. Cambridge: Harvard University Press.</ref> 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 [[Reductionism|reducible]] to [[fundamental interaction]]s. Similarly, a cause cannot have an effect outside its future light cone.