The concept of time travel challenges our understanding of causality from "summary" of Time Travel in Einstein's Universe by J. Richard Gott
Time travel, a tantalizing idea that has captured the imagination of many, presents a multitude of paradoxes and challenges to our understanding of causality. Causality, the concept that events occur in a sequence determined by preceding events, forms the bedrock of our understanding of how the world works. However, when time travel is introduced into the equation, this linear progression of cause and effect is thrown into disarray. One of the fundamental issues that time travel raises is the concept of backwards causation. In a world where time travel is possible, events from the future could potentially influence events in the past, creating a loop where cause and effect become intertwined and indistinguishable. This challenges our traditional understanding of causality, which posits that causes must precede their effects in time. Furthermore, the concept of closed timelike ...
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