Closed timelike curves: theory, experiments, and paradox resolution

An optical analogue proposal could probe chronology protection, while CTC studies address entropy reset, Wigner-consistent memory, quantum noise, and decoherence. NANOGrav has revived interest in Gott's cosmic-string scenario without providing evidence for practical time machines; popular-culture analyses remain useful mainly for comparing Novikov, many-worlds, and E-CTC models.