Can outside matter decrease the event horizon size of a black hole?
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llow anything to go outside its event horizon, then how can it interact electromagnetically with an outside charge?
A nice answer (of quantum -mechanical nature) to both questions is in the book of Tai L. Chow, " Gravity, Black Holes, and the Very Early Universe " Springer, 2008, see p. 106, sec. 6.8 " how do electrical and gravitational fields get out of black holes ? "
A more classical (non quantum) answer is related to the fact that the three distinguishing properties possessed by black holes, namely mass, charge, and angular momentum, are preserved because they are associated with long range fields that can exert an influence at large distances.
A nice answer (of quantum -mechanical nature) to both questions is in the book of Tai L. Chow, " Gravity, Black Holes, and the Very Early Universe " Springer, 2008, see p. 106, sec. 6.8 " how do electrical and gravitational fields get out of black holes ? "
A more classical (non quantum) answer is related to the fact that the three distinguishing properties possessed by black holes, namely mass, charge, and angular momentum, are preserved because they are associated with long range fields that can exert an influence at large distances.
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The size of an event horizon depends on the black hole's mass. If Earth were compressed until it became a black hole, it would have a diameter of about 0.69 inches.
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