The four-fermi coupling of the supersymmetric non-linear sigma-model on G/S\otimesU(1)^k

Details The four-fermi coupling of the supersymmetric non-linear sigma-model on G/S\otimesU(1)^k The four-fermi coupling of the supersymmetric non-linear sigma-model on G/S\otimesU(1)^k

2000-01-25

arxiv.org/abs/hep-th/0001160v1

Nucl.Phys. B578 (2000) 449-476

Physics

High Energy Physics

High Energy Physics - Theory

33 pages, 1 figure, to appear in Nuclear Physics B

Scientific paper

10.1016/S0550-3213(99)00788-9

The reducible K\"ahler coset space G/S\otimesU(1)^k is discussed in a geometrical approach. We derive the formula which expresses the Riemann curvature of the reducible K\"ahler coset space in terms of its Killing vectors. The formula manifests the group structure of G. On the basis of this formula we establish an algebraic method to evaluate the four-fermi coupling of the supersymmetric non-linear sigma-model on G/S\otimesU(1)^k at the low-energy limit. As an application we consider the supersymmetric non-linear sigma-model on E_7/SU(5)\otimesU(1)^3 which contains the three families of {10} + {5^*} + {1} of SU(5) as the pseudo NG fermions. The four-fermi coupling constants among diffferent families of the fermions are explicitly given at the low-energy limit.

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