Superstring theory predicts the existence of relic metastable particles whose
average lifetime is longer than the age of the universe and which could, in
principle, be good dark matter candidates. At the same time, these states would
be responsible for the Ultra High Energy Cosmic Rays (UHECR) events which will
be searched for by various experimental collaborations in the near future. We
describe a possible phenomenological path which could be followed in order to
search for new physics in their detection.Comment: 7 pages 4 Figs. Plenary Talk presented by Claudio Coriano' at the 1st
Intl. Conf. on String Phenomenology, Oxford, UK, July 6-11, 200
