Nonthermal Supermassive Dark Matter
  We discuss several cosmological production mechanisms for nonthermal supermassive dark matter and argue that dark matter may be elementary particles of mass much greater than the weak scale. Searches for dark matter should not be limited to weakly interacting particles with mass of the order of the weak scale, but should extend into the supermassive range as well. 
Daniel J. H. Chung, Edward W. Kolb, Antonio Riotto