‘Back to the future’ messages are more efficient

According to Physics World, theoretical physicists have discovered that closed time-like curves—hypothetical loops in spacetime permitted by Einstein's general relativity—could transmit information more efficiently than previously calculated. The finding suggests that sending messages backwards in time through these exotic pathways might be more efficient than earlier models predicted. While actual time travel remains speculative, the work offers insights into how information behaves in extreme spacetime geometries.

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