Supersymmetry, Superstrings and Phenomenology

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The goal of the present proposal is to search for new physics at thedeepest subnuclear level in order to improve our understanding of naturalphenomena at the very highest energies as well as at the very early stagesof the universe. We plan to employ both the ``bottom-up''approach of supersymmetry and possible hidden extra dimensions in nature as well as the ``top down'' approach where all particles are replaced by wiggly strings to seek new physics that can explain present experimentalobservations related to neutrinos, dark matter and dark energy of theuniverse, origin of matter etc. The results of this study may not onlybroaden our understanding of the forces and matter in the universe but itmay also provide a window to its future evolution.