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If the speed of gravity is the speed of light, how can someone outside of a black hole detect its change of mass? (lemmy.ml)

submitted 1 day ago by [email protected] to c/[email protected]

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I clarify my question: beyond the event horizon of a black hole, according to general relativity, the space-time flows faster than the speed of light. If it is the case, then, no information can be transmitted from here.

But then, if i drop an apple, say, in the black hole.

The black hole would then gain mass, and i could theorically mesure that gain with the event horizon radius variation and the attraction, meaning that the information of its mass and attraction change went from the center to get out of the event horizon.

In other words, that gravity information would have been faster than light?

How is that possible and where did i not understand something? (Just daydreamed about this stuff so maybe my question in itself is idiotic, sorry physicists)

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[–] [email protected] -2 points 10 hours ago (1 children)

In no way listen to anything I ever say anywhere. But especially on physics.

That being said, my understanding is that quantum computing is revolutionary because it allows instant transmission of information across unlimited space.

Particles that mimic each other can be placed on either end of a 'would-be-cable' connection and machines can interpret their on and off states as binary.

What happens to a set of these paired particles if one goes into a black hole? Now that I wanna know!

[–] [email protected] 7 points 9 hours ago (1 children)

quantum computing is revolutionary because it allows instant transmission of information across unlimited space

False and common misconception! In quantum mechanics there is even a theorem called the no-communication theorem that mathematically proves that no information can ever be transmitted by quantum entanglement. Sorry!

[–] [email protected] 3 points 5 hours ago

Never be sorry for knowing something! Thank you for the info! :)