Time travel raises paradoxes and conundrums from "summary" of The Fabric of the Cosmos by Brian Greene
In contemplating time travel, one is immediately struck by the dizzying array of paradoxes and conundrums that it raises. The notion of traveling back in time to alter the course of history, for example, gives rise to the famous "grandfather paradox." If one were to journey back in time and prevent one's grandfather from meeting one's grandmother, then one's own existence would be negated. But if one were never born, how could one have traveled back in time in the first place? This circular logic leads to a logical impasse, highlighting the inherent contradictions that time travel entails. Furthermore, the concept of time loops introduces yet another layer of complexity. In a time loop scenario, an individual could find themselves caught in an endless cycle of events, repeating the same actions over and over again. The implications of such a scenario are mind-boggling, as it raises questions about free will, causality, and the nature of reality itself....
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