Either neutralino dark matter or cuspy dark halos

We show that if the neutralino in the minimal supersymmetric standard model is the dark matter in our galaxy, there cannot be a dark matter cusp extending to the galactic center. Conversely, if a dark matter cusp extends to the galactic center, the neutralino cannot be the dark matter in our galaxy. We obtain these results considering the synchrotron emission from neutralino annihilations around the black hole at the galactic center. We comment on how we may try to avoid these conclusions. (C) 2000 Elsevier Science B.V. All rights reserved.