Paradoxes of causal loops in spacetime

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There is, among some scientists and philosophers, the idea that any theory that would allow the time travel would introduce causal issues. (Bolonkin 2011) These types of temporal paradoxes can be avoided by the Novikov self-consistency principle or by a … Read More

Grandfather paradox in time travel

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(Top: original billiard ball trajectory. Middle: the billiard ball emerges from the future, and delivers its past self a strike that averts the past ball from entering the time machine. Bottom: the billiard ball never enters the time machine, giving … Read More