%0 Journal Article %T The Nature of Dark Matter %A Georg G. Raffelt %J Physics %D 1995 %I arXiv %X The dynamics of the universe may be dominated by novel weakly interacting elementary particles, by baryons in an invisible form, by black holes, and globally by vacuum energy. The main arguments for and against such hypotheses are reviewed. %U http://arxiv.org/abs/astro-ph/9511041v1