These notes are intended to be an introduction to the theory and phenomenology of gravitation in many dimensions, coupling to matter confined to a four-dimensional hypersurface (identified with the visible Universe). The basic framework for this is worked out in the large extra dimensions model of Arkani-Hamed, Dimopoulos and Dvali (ADD). Our focus is on the phenomenological consequences of this scenario. Other aspects of the model are treated in the lectures by Sandip Trivedi in this volume—these should be read in conjunction with those and meant to complement those.
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