Understand
Closed timelike curves (CTCs) are trajectories in spacetime that effectively travel backwards in time: a test particle following a CTC can in principle interact with its former self in the past.
- CTCs appear in many solutions of Einstein's field equations and any future quantum version of general relativity will have to reconcile them with the requirements of quantum mechanics and of quantum field theory.
- A widely accepted quantum theory of CTCs was proposed by Deutsch.
- Here we explore an alternative quantum formulation of CTCs and show that it is physically inequivalent to Deutsch's.
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