We show that quantum hair can alter the relation between the temperature and the mass of a black hole. A Z N electric charge on a black hole generates an electric field that is non-perturbative in ħ. A Z N magnetic charge on a black hole can be described classically, and can support a stable remnant. For global quantum hair, in contrast to gauge hair, we find no dynamical effects.
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Coleman et al. (1991) studied this question.