closed time loop

Repeating causal cycle

A closed time loop is a theoretical concept in physics and a common device in science fiction where a sequence of events circles back on itself, with the end causing the beginning.

In such a loop, cause and effect become circular rather than linear—a character might travel back in time and set in motion the very events that led to their traveling back.

Unlike open-ended time travel, a closed loop is self-contained and paradox-free because everything that happens was always going to happen.

The movie's twist revealed the hero had been trapped in a closed time loop all along.

philosophy

determinism

Doctrine of causal necessity

  • free willAutonomous choice capacity
  • fatePredetermined course of events
  • destinyPredetermined course of events

inevitability · predestination · immutability · choice · agency · fatalism · Nietzsche · Ouroboros · Möbius · karma

paradox

bootstrap

Start without external resources

ontological · retroactive · consistency · fixed point · self-consistent · impossibility · chicken-and-egg · self-creating

narrative

Groundhog Day

Marmot weather prediction tradition

Predestination · Terminator · Tenet · Triangle · Edge of Tomorrow · Source Code · Interstellar · Palm Springs · Donnie Darko · Majora's Mask

mechanics

temporal

Relating to chronology

  • iterationRepeated procedural pass
  • resetRestore to original state
  • cycleRepeating sequence of events

repetition · recurrence · trigger event · memory retention · awareness · variation · convergence · divergence · timeline · anchor point

Opposites
temporal structure

closed time looplinear time

Duration moving one direction

linear progression · arrow of time · chronological sequence

causal determinism

closed time loopbranching timeline

Parallel diverging event sequences

divergent timeline · alternate timeline · multiverse · parallel universe · parallel universes

Family

close, closed, closely, closeness, closer, closest, closing, closure, enclose

Familiarity
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Used worldwide · Timeless · Abstract · Rated G