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or maybe for some weird reason a graviton can't escape a black hole.

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- Thread starter cragar
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or maybe for some weird reason a graviton can't escape a black hole.

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tiny-tim

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When two electrons repel each other electromagnetically, they don't

Similarly, when two bodies attract each other gravitationally, they don't

The photons or gravitons are only virtual particles , which are mathematical fictions designed to help in calculations (in perturbation theory in quantum field theory) of the electromagnetic or gravitational field.

In other words, no graviton leaves the black hole to attract something else, the attraction is done by the field, and the field is calculated mathematically with the help of non-existent "virtual gravitons".

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i see , thanks for the answer .

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The notion of virtual particles mediating static forces comes from perturbation theory, and if there is one thing we know about quantum gravity, it's that the usual way of doing perturbation theory doesn't work.

see http://math.ucr.edu/home/baez/physics/Quantum/virtual_particles.html

In other words, all we know about gravity is that it is not like electromagnetism.

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