Theoretical physicists have proposed a potential mechanism for time travel using ring-shaped wormholes. These hypothetical shortcuts in spacetime have been a subject of scientific speculation for decades. The researchers explored the behavior of a ring wormhole connecting patches of flat spacetime, considering various scenarios and effects on the structure. They discovered solutions that included closed timelike curves, which describe objects or light rays returning to their starting point both in space and time. While numerous obstacles and paradoxes remain, this study contributes to the ongoing exploration of the intersection between quantum physics and general relativity.
Source: https://iopscience.iop.org/article/10.3847/2041-8213/ace188