2 ms·
Unless it's a spinning black hole, which contains closed timelike curves that can be reached from and can escape back to the outside universe?
by inigyou 2mo ago
Unless it's a spinning black hole, which contains closed timelike curves that can be reached from and can escape back to the outside universe?
- XorNot 2mo agoNone of those proposed time machines has ever turned out to be theoretically workable when the details are investigated more closely by physicists.
- pdonis 2mo agoKerr spacetime contains closed timelike curves inside the inner horizon. You can reach them from the outside universe, but you can't escape back out. Also, the region inside the inner horizon of Kerr spacetime is widely considered to be not physically reasonable, not just because of the closed timelike curves, but because the inner horizon itself is unstable--there is an infinite blueshift there which, it is believed, would cause it to be destroyed by the first tiny bit of incoming matter or radiation.