When a massive star cannot produce sufficient energy to counter it's weight the result is often a neutron star which is stabilized by quantum mechanical effects, say given enough mass to overcome such effects it becomes a black hole. I wonder if it can lose energy until it reverts into neutron star? If not why not?
Answer
I wonder if it can lose energy until it reverts into neutron star? If not why not?
Not at the moment, because nothing leaves the black hole. To lose energy/mass something has to leave, radiation or particles, and nothing can leave except Hawking radiation from the horizon, draining energy from the black hole. This is too weak to enter the picture, unless one is talking of the end of time of the universe, then yes it could happen
A scenario with two black holes falling into each other and losing energy in gravitational waves (LIGO experiment) , would still create a new black hole where nothing substantial leaves. I do not know whether a limiting condition, where gravitational radiation is large enough but the joint mass not enough to form the new black hole, might exist. I suspect not.
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