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kent davidge
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How should we deal with the fact that GR predicts light not scaping from a BH while QM states BHs radiate?
kent davidge said:How should we deal with the fact that GR predicts light not scaping from a BH while QM states BHs radiate?
pervect said:I believe it is correct to say that if we consider a quantum mechanical model of a particle detector, if such a detector is in a vacuum and not accelerated it will not detect particles. Furthermore, there will be no Killing horizon. However, if the detector does accelerate in the same vacuum, it will detect the presence of particles and the space-time will have a Killing horizion, the Rindler horizon.
The general theory of relativity describes the behavior of gravity and the curvature of space-time, while quantum mechanics explains the behavior of particles at the subatomic level. When it comes to understanding light from black holes, GR describes how gravity affects the path of light near a black hole, while QM explains how particles of light (photons) behave at a quantum level.
According to GR, the massive objects such as black holes warp the fabric of space-time, causing light to follow a curved path around them. This results in the phenomenon of gravitational lensing, where light from distant objects is bent and distorted as it passes near a black hole.
The event horizon is the point of no return around a black hole, where the gravitational pull is so strong that not even light can escape. According to GR, the escape velocity at the event horizon is equal to the speed of light, which is why nothing, including light, can escape from a black hole once it crosses the event horizon.
Yes, according to QM, particles are constantly appearing and disappearing in the vacuum of space, known as virtual particles. When this happens near a black hole, one of the particles can be pulled into the black hole while the other escapes as Hawking radiation. This phenomenon is predicted by QM and has been observed in experiments.
The theory of quantum gravity is an attempt to combine GR and QM to explain the behavior of gravity at both the macroscopic and microscopic level. In this theory, gravity is described as a force carried by particles called gravitons, and it is believed that these particles can interact with both space-time (described by GR) and matter (described by QM) to explain the behavior of light from black holes.