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Now imagine your colleague Sally is interested in more hands-on investigation of time inside a black hole, and decides to dive towards it. Before she leaves, Sally agrees to flash a light back to you every second. From your perspective, Sally appears to slow down as she approaches the black hole, and the time interval between her flashes of light gradually increases. Additionally, the light she sends back to you gradually gets dimmer and redder. According to your perspective, Sally never actually descends into the black hole; she will travel more and more slowly as she approaches the event horizon, but you will never actually see her reach “the point of no return.” Time comes to a standstill at the event horizon, such that an outside observer will never really see anything fall inside a black hole. Strangely enough, this even includes the surface of the star that collapsed to form the black hole! - See more at: www.skyandtelescope.com...
Outline of the Answer Two inertial observers will agree on the ground state of a quantum field However, an accelerating observer and a constant velocity observer will NOT agree on the quantum field they see. An accelerated observer will see a black body thermal bath of photons. This effect is called the Unruh effect and the Unruh temperature is directly proportional to the acceleration. By the equivalence principle, what an observer held stationary in the gravitational field experiences above a black hole is indistinguishable from that of the accelerated observer, and therefore should also see a black body spectrum, analogous to the Unruh radiation, emanating from the black hole. If we can show that the surface gravity of a black hole, which is analogous to the Unruh acceleration, is inversely proportional to the black hole mass, then we have shown that smaller black holes radiate at higher temperatures the large black holes. If it can be shown that smaller black holes have higher temperatures, then it can be shown the small black holes evaporate at a greater rate.
originally posted by: kykweer
My goal is to set out whether if you pass the event horizon of a black hole does the universe end?
originally posted by: Soylent Green Is People
a reply to: kykweer
...I mean, when did it happen? It didn't happen during the infinite period that the outside observer was watching. So when?
What am I missing here?
originally posted by: Astyanax
a reply to: kykweer
To the person who says it's all theory: look up in the sky. The reality of what these guys describe is smeared all round every single black hole we have ever identified, broadcasting their presence for megaparsecs around.