StarTalk Radio Cosmic Queries – Black Hole Time Cloak with Charles Liu
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Apr 12, 2024 Astrophysicist Charles Liu joins Neil deGrasse Tyson to discuss distorting spacetime, singularities, the shape of the universe, and more. Topics include creating a time cloak with black holes, time stopping, Quantum Entanglement, light detection limits in the universe, and the geometry of the universe.
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Black Holes Warp Spacetime
- Black holes warp spacetime so strongly that event horizons form, defining their boundaries rather than being just concentrated gravity points.
- Near a black hole, time for an observer slows drastically compared to outsiders, but locally feels normal to the falling observer.
Black Holes as Objects and Places
- Black holes are objects that can move and collide, containing singularities which may be places inside them.
- From outside, falling into a black hole appears frozen in time at the event horizon due to extreme time dilation.
Quantum Entanglement Limits
- Quantum entanglement suggests instantaneous information transfer, but no current experiment confirms faster-than-light info transfer.
- No known physical principle forbids it, but practical evidence remains elusive.