Singularities in black holes could be used as gateways for time travel from "summary" of Time Travel in Einstein's Universe by J. Richard Gott
According to the theory of general relativity, a singularity is a point where the curvature of spacetime becomes infinite. In the context of a black hole, the singularity is located at the center, where the gravitational pull is so strong that nothing, not even light, can escape. This singularity is often thought of as a point of infinite density and zero volume. One intriguing possibility is that these singularities could potentially serve as gateways for time travel. The idea is based on the concept of wormholes, which are hypothetical tunnels that connect two separate points in spacetime. If a singularity in a black hole could be connected to another point in spacetime, it might be possible to traverse through the singularity and emerge at a different time and place. However, there are significant challenges and uncertainties associated with this idea. For one, the extreme conditions near a black hole's singular...
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