The laws of physics behave the same just inside the event horizon as just outside it.
Don’t try to do a quantum experiment near a black hole — its mere presence ruins all quantum states in its vicinity, researchers say.pits the rules of quantum mechanics and black holes against each other
“The idea is to use properties of the [theories] that you understand, which [are] quantum mechanics and gravity, to probe aspects of the fundamental theory,” which is quantum gravity, says theoretical physicist Gautam Satishchandran of Princeton University. . But if someone, or some device, measures the particle’s path, it will register as having gone through one slit or the other. The particle’s quantum state of apparently being in two places at once collapses.
When Bob observes which slit Alice’s particle went through, the particle’s quantum state will collapse. That would also let Alice know Bob is there, messing up her experiment. But that’s a paradox — nothing done inside a black hole should affect the outside. By the laws of physics, Bob should not be able to communicate with Alice at all.“The paradox is that black holes are a one-way street,” Satishchandran says.
“The horizon actually ‘knows’ which way the particle went,” mathematically speaking, Satishchandran says. Alice blames the black hole for ruining her experiment, not Bob, and the paradox is resolved.
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