Possible evidence for the observation of noncompact (nonbaryonic) gravitational microlenses ("neutralino stars")

The microlensing of distant stars by noncompact objects such as neutralino stars is considered. Recently, Gurevich and Zybin considered the objects as microlenses. Using a nonsingular density distribution, we analyze microlen sing by noncompact objects. We obtain analytic solutions to the gravitation al-lens equation and an analytic expression for the amplification factor of the gravitational lens. We show that, on the basis of a model of microlens ing by noncompact objects, it is possible to interpret microlensing-event c andidates having two typical maxima of light curves which are usually inter preted as binary microlenses, (C) 2000 MAIK "Nauka/Interperiodica".