Mathematician Lorenzo Gavassino from Vanderbilt University has proposed a theory that time travel along closed timelike curves (CTCs) leaves no memories or evidence due to fundamental laws of physics. The second law of thermodynamics requires that a system’s entropy return to its original state, making all processes reversible. This means a traveler cannot retain memories of their journey, and any records or traces would be erased.
Gavassino argues that attempts to capture evidence, such as on electronic devices or through messages left in the past, are doomed to fail. If a traveler tries to transmit information in the past, either a “grandfather paradox” arises (the information must already exist in the present), or entropy upon return erases all traces, rendering the message inaccessible. Thus, nature protects the timeline by eliminating any interventions.
This theory aligns with Novikov’s self-consistency principle, which suggests that events in CTCs cannot contradict cause-and-effect relationships. Additionally, research in quantum gravity, such as Stephen Hawking’s work, indicates that CTCs may be physically impossible due to quantum uncertainty effects disrupting the stability of time loops.
Future studies could test Gavassino’s theory by simulating quantum systems or analyzing entropy processes near extreme objects like black holes. For now, the hypothesis underscores that time travel, even if possible, would not allow travelers to realize or prove their experience, preserving the integrity of the universe’s timeline.
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