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  Is the g-factor of a charged black hole 2 or is it 2+alpha/pi?

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Many papers over the past 40 years discuss the magnetic moment and the $g$-factor of a black hole in the zeroth approximation and get the result $g=2$.

But what happens to the next approximation? Is the precise value

$g=2$  or $g= 2 + \alpha/\pi$ ?

Here $\alpha$ is the fine structure constant. Are there papers (I did not find any) or ideas on the issue? Will these values ever be tested in measurements?

asked Apr 10, 2020 in Open problems by Magnetic Lady [ no revision ]

A black hole, as a macroscopic body, may have any $g$-factor, in my humble opinion. It really depends on particulat properties involved.

All papers (dozens) state that g=2 for black holes. But none mentions corrections in alpha.

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