Abstract
It is shown that a black hole of fixed mass can carry arbitrary axionic charge. The unique static black-hole solution is found to have vanishing axion field strength but nonvanishing potential. The axion charge cannot be detected by point particles, but can be detected by strings in a process analogous to the Aharonov-Bohm effect. It is argued that the existence of axion charge may play a significant role in the late stages of black-hole evaporation.
Highlights
It is shown that a black hole of fixed mass can carry arbitrary axionic charge
The axion charge cannot be detected by point particles, but can be detected by strings in a process analogous to the Aharonov-Bohm effect
It is argued that the existence of axion charge may play a significant role in the late stages of black-hole evaporation
Summary
It is shown that a black hole of fixed mass can carry arbitrary axionic charge. The unique static black-hole solution is found to have vanishing axion field strength but nonvanishing potential. ' When gravity is coupled to other fields, black holes may carry conserved charges of the system which can be expressed as surface integrals at infinity. 19 DECEMBER 1988 holes (stationary solutions to the field equations of the coupled gravitational-axion system) with nonzero axion charge.
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