2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186796Ultrahigh energy cosmic rays provide a unique ground for probing new physics. In this talk we review the possibility of testing TeV gravity in interactions of cosmogenic neutrinos and the potential to discover long-lived exotic particles in nucleon-produced air showers, such as gluinos of split-SUSY models or staus of supersymmetric models with a gravitino LSP.Presented at the XXXI International Conference of Theoretical Physics "Matter To The Deepest: Recent Developments In Physics of Fundamental Interactions", Ustron, 5-11 September 2007, Poland; 7 pagesHigh Energy Physics - Phenomenologytext