Higgsino and wino dark matter from Q-ball decay in Affleck-Dine baryogenesis

We claim that the higgsino-like and wino-like neutralinos can be good dark matter candidates if they are produced by the late time decay of Q-ball, which is generally formed in Affleck-Dine baryogenesis. The late time decays of the Q-balls into these LSP's and subsequent pair annihilations of the LSPs naturally lead to the desired mass density of dark matter, Furthermore, these dark matter can be much more easily detected by the dark-matter search experiments than the standard bino-like dark matter. (C) 2002 Elsevier Science B.V. All rights reserved.