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Hawking radiation is explained by particle-antiparticle creation. A particle with positive energy escapes away from the black hole while the particle with negative energy falls down.

Why isn't that vice versa? A particle with positive mass should fall down due to gravity force, while the negative mass is to be repeled by the gravity force?

Edit: I think was wrong about the gravity repeling the negative mass. Even though the force is directed away from the black hole, a=F/m so the particle still falls down the black hole! Now I see no point why any particles should be escaping more than the other?

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