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)
The change in mass, electric charge, angular momentum are the only things that are detectable after the apple crosses the black hole - no hair theorem. As far as we know, no quantum information is recoverable. We don’t actually, like, see the apple ever cross the event horizon it’s a whole weird thing. The event horizon conceals all events from the interior of the black hole from the rest of the universe - we never see anything about the center of the black hole or any part inside it, ever. It’s all cut off.
The additional mass that changes how much additional force there is due to gravity is communicated at the speed of light, no faster.
There are interesting theories about black hole holography, universe holography brane vs bulk stuff, whatever.