Axionic Black Holes from Massive Axions
Theodore J. Allen, Mark J. Bowick, and Amitabha Lahiri
Department of Physics
Syracuse University, Syracuse, NY 13244-1130
A black hole may carry axionic charge in a theory which has gravity coupled to a
massless two-form Kalb-Ramond field. We show that this effect persists if the axion
has a topological mass term coupling the Kalb-Ramond potential to a U(1) gauge
field. Such mass terms arise in the low-energy effective theory of the string.
Bitnet addresses: tjallen@suhep, bowick@suhep, lahiri@suhep.
The stationary black hole solutions to Einstein's equations in vacuo  are
uniquely characterized by the mass M and angular momentum J . Generally one
expects that the gravitational field must be coupled to a massless field for a black hole
solution to acquire another parameter or charge. For the coupled Einstein-Maxwell
equations there are two additional parameters, the electric charge e and the magnetic
charge µ  and again there is a uniqueness theorem . A great deal of the interest
and importance of these classical solutions derives from their uniqueness, since they