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According to p. 303-304 of the book Gravity from the Ground up by physicist Bernard Schutz, viewable on google books here, it's because in terms of the pair-production explanation for Hawking radiation, one member of the pair actually has negative energy and thus causes the black hole to lose mass (negative mass/energy falling into a black hole can also ...


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The black hole initially lost the gravitational energy that was needed to create the pair. The pair-creation model is a bad description of Hawking radiation, which for macroscopic black holes is really photons. The second particle that gets created above the event horizon doesn't have nearly enough energy to escape. It does, however, produce photons above ...


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In the case of Hawking radiation, the direct answer is "no, there is no direct test, nor can we imagine one with anything like current technology." But it is not some wild speculation made in vacuum. The extremely closely related Unruh effect can be derived from basic quantum field theory on a curved spacetime, and many QFT and GR texts have at least an ...


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It's a calculation in Quantum Field Theory in Curved (fixed) Space Time. The point is not whether the calculation is exact (on this, there is probably no doubt), but whether that semiclassical approximation is adequate to describe the black hole horizon. So yes, there are no experimental evidence (the effect is very small), and the radiation may very well be ...


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I don't think the answer is too exciting. The Schwarzschild solution is a static solution to the Einstein field equations. The Einstein field equations alone don't take into account quantum effects. Taking quantum effects into account will give you a modification of the solution, and the result that the Schwarzschild 'solution' is no longer static (and so ...


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It appears the main confusion here lies in the concept of a particle. So to simplify things, first consider flat space-time which is sufficient to discuss most of the issues here. An accelerating observer in flat space-time will see an event horizon of a finite temperature, emitting particles. This is called Unruh radiation. This is purely a coordinate ...


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A pair of virtual particles are formed on the event horizon of a black hole--this is a particle anti-particle pair. These form all the time, but they usually just annihilate each other. However, if they form just on the black hole's event horizon, then one will be trapped in the gravitational field of the black hole, while the other can escape freely. Thus, ...



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