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Time travel comes in two distinct flavors: the linear Closed Loop variety and the branching Open Loop variety. The first is stable and reliable, while the second is volatile and chaotic. In many time-travel stories, the reader doesn’t know for certain which variety is in effect until the end.
These three different types are open-loop time travel, closed-loop, and parallel-dimensions. Each type has its use, and each lend themselves towards different kinds of stories. In this beginners guide, we will cover each major type of time travel in turn.
An open causal loop, on the other hand, involves a sequence of events that appears to form a loop but has a clear origin point. The events in the loop are causally connected, but there is an initial cause that starts the loop.
A closed loop. Suppose the plans for a time machine suddenly appear from thin air on your desk. You spend a few days building it, then use it to send the plans back to your earlier self.
Time travel stories typically involve a character entering a loop, and so their story is an open causal loop. The common theme is backward causality, or when effect precedes cause. This flies in the face of our everyday experiences, and so is naturally something we find impossible to occur.
Physicists find that causal loops, where two events separated in time influence each other in paradoxical ways, are allowed in many theoretical universes, some of which share features with our...
A temporal paradox, time paradox, or time travel paradox, is a paradox, an apparent contradiction, or logical contradiction associated with the idea of time travel or other foreknowledge of the future.
The raised issues are different for the time travel in the past compared to the time travel in the future. Note that the following aspects are not considered to be time travel: sleep, cryogenic freezing, virtual reality simulator, crystal ball predictions, isolation, time zone change, etc.
Time travel: One or more people travel forward or backward through time, usually intentionally. Multiple instances of the person or people traveling through time may exist simultaneously. Time loop: One or more people repeat a relatively fixed period of time over and over, usually against their will. Through any given loop there is only one ...
The concept of time travel — moving through time the way we move through three-dimensional space — may in fact be hardwired into our perception of time. Linguists have recognized that we are ...