Four-dimensional M-theory and supersymmetry breaking

Abstract

We investigate compactifications of M-theory from $11\to 5\to 4$ dimensions and discuss geometrical properties of 4-d moduli fields related to the structure of 5-d theory. We study supersymmetry breaking by compactification of the fifth dimension and find that an universal superpotential is generated for the axion-dilaton superfield $S$. The resulting theory has a vacuum with $<S>=1$, zero cosmological constant and a gravitino mass depending on the fifth radius as $m_{3/2}\sim R_5^{-2}/M_{Pl}$. We discuss phenomenological aspects of this scenario, mainly the string unification and the decompactification problem.

23 pages, LaTex, 1 figure

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