The legendary logician Kurt Gödel shocked physicists by doing something no one expected:

In 1949, the legendary logician Kurt Gödel shocked physicists by doing something no one expected:
he found an exact solution to Einstein’s equations where time can loop back on itself.

His rotating universe model, the Gödel metric showed that closed timelike curves (CTCs) aren’t just mathematical games. In this spacetime, you could, in principle, travel into your own past.

Gödel even used this to argue that time isn’t fundamentally real just a feature of human perception.

Of course, his universe isn’t our universe.
It requires global rotation (ruled out by CMB observations), a negative cosmological constant, and no cosmic expansion. But despite its physical impossibility, Gödel’s idea became a playground for theorists exploring gravity, causality, and the limits of Einstein’s theory.

A rotating cosmos that breaks causality, invented by the same man who broke mathematics.

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