Just 3 Lines of Math Rule Out Time Travel in Many Possible Universes, Physicist Says

Physicist Hongsheng Zhang of the University of Jinan used the null eikonal equation in a three‑line proof to show that in a broad class of possible universes a light‑like direction can never be orthogonal to a traveller’s time direction, implying a certain quantity always increases and closed time loops cannot occur.

Source: Just 3 Lines of Math Rule Out Time Travel in Many Possible Universes, Physicist Says — ScienceAlert

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