D=5 M-theory radion supermultiplet dynamics

Details D=5 M-theory radion supermultiplet dynamics D=5 M-theory radion supermultiplet dynamics

2002-10-23

arxiv.org/abs/hep-th/0210228v1

Nucl.Phys.B661:273-288,2003

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, 4 figures, plain Latex

Scientific paper

10.1016/S0550-3213(03)00265-7

We show how the bosonic sector of the radion supermultiplet plus d=4, N=1 supergravity emerge from a consistent braneworld Kaluza-Klein reduction of D=5 M--theory. The radion and its associated pseudoscalar form an SL(2,R)/U(1) nonlinear sigma model. This braneworld system admits its own brane solution in the form of a 2-supercharge supersymmetric string. Requiring this to be free of singularities leads to an SL(2,Z) identification of the sigma model target space. The resulting radion mode has a minimum length; we suggest that this could be used to avoid the occurrence of singularities in brane-brane collisions. We discuss possible supersymmetric potentials for the radion supermultiplet and their relation to cosmological models such as the cyclic universe or hybrid inflation.

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