![]() ![]() Even if you can’t measure that a copy has been made, pushing the infalling information in the outgoing radiation changes the vacuum state in the horizon vicinity to a state which is no longer empty: that’s the firewall.īe that as it may, even in black hole complementarity the infalling observer still falls in, and crosses the horizon at a finite time. Now, the black hole firewall issue points out that black hole complementarity is inconsistent. Making such measurements is typically impossible because the infalling observer only has a limited amount of time before hitting the singularity.īlack hole complementarity is actually a pretty philosophical idea. The idea of black hole complementarity is that nobody can ever make a measurement to document the forbidden copying and hence, it isn’t a real inconsistency. This is in contradiction with quantum mechanics which forbids making exact copies of a state. According to black hole complementarity the information that falls into a black hole both goes in and comes out. Which is indeed a highly contest area of current physics research. I suspect this confusion was caused by the idea of black hole complementarity. The outside observer’s story is an infinitely stretched version of the infalling observer’s story, covering only the part before horizon crossing. There is no contradiction between the conclusions they draw. The two observers have different descriptions of the process of falling into a black hole because they both use different time coordinates. “As you approach a black hole, you do not notice a change in time as you experience it, but from an outsider’s perspective, time appears to slow down and eventually crawl to a stop for you So who is right? This discrepancy, and whose reality is ultimately correct, is a highly contested area of current physics research.” In an article that recently appeared on “Quick And Dirty Tips” ( featured by SciAm), Everyday Einstein Sabrina Stierwalt explains: It might just take a few hundred billion years. If you take into account that black holes evaporate, it doesn’t quite take forever, and your friends will eventually see you vanishing. For an outside observer however, you seem to be moving slower and slower and will never quite reach the black hole, due to the (technically infinitely large) gravitational redshift. It takes you a finite time to reach the horizon of a black hole. You would, however, probably be torn apart before crossing the horizon of a solar-mass black hole. Leaving aside lots of hot gas and swirling particles, you have good chances to survive crossing the horizon of a supermassive black hole, like that in the center of our galaxy. The larger the mass, the smaller the space-time curvature at the horizon, and the smaller the tidal force. Whether this happens before or after you cross the horizon depends, again, on the mass of the black hole. It will stretch any extended object in a process with technical name “spaghettification.” That’s what will eventually kill you. The gravitational pull itself isn’t the problem, the problem is the change in the pull, the tidal force. The difference is that, since a black hole doesn’t have a surface, the gravitational pull can continue to increase as you approach the center. At a fixed distance from the center, it isn’t any stronger or weaker than that of a star with the same mass. The gravitational pull of a black hole depends on its mass. If you fall into a black hole, you’ll die. ![]()
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