Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-09-29
Physics
High Energy Physics
High Energy Physics - Theory
31 pages, harvmac big. To appear in the proceedings of TASI 1999 and the 2000 Trieste Spring Workshop on Superstrings
Scientific paper
In these lectures, two different aspects of brane world scenarios in 5d gravity or string theory are discussed. In the first two lectures, work on how warped compactifications of 5d gravity theories can change the guise of the hierarchy problem and the cosmological constant problem is reviewed, and a discussion of several issues which remain unclear in this context is provided. In the next two lectures, microscopic constructions in string theory which involve D-branes wrapped on cycles of Calabi-Yau manifolds are described. The focus is on computing the superpotential in the brane worldvolume field theory. Such calculations may be a necessary step towards understanding e.g. supersymmetry breaking and moduli stabilization in stringy realizations of such scenarios, and are of intrinsic interest as probes of the quantum geometry of the Calabi-Yau space.
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