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Two of the greatest mysteries of modern physics are the origin of the darkmatter in the universe and the nature of the highest energy particles in thecosmic ray spectrum. We discuss here possible direct and indirect connectionsbetween these two problems, with particular attention to two cases: in thefirst we study the local clustering of possible sources of ultra-high energycosmic rays (UHECRs) driven by the local dark matter overdensity. In the secondcase we study the possibility that UHECRs are directly generated by the decayof weakly unstable super heavy dark matter.Comment: 15 pages, 7 figures. Invited Talk at the "International Workshop on  observing UHECRs from space and earth", August 9-12, 2000, Metepec, Puebla  (Mexico

Dark matter distribution in the universe and ultra-high energy cosmic rays