Superconformal anomaly free models in D=4
Abstract
A family of modified (0,1) heterotic string models in D=4 is constructed in which the strings incorporate R flux tubes which may in special cases support a local spacetime superconformal symmetry consistent with quantum mechanics. There is an intrinsic Goldstino multiplet, so that supersymmetry breaking can be driven by any process that generates a non-zero value for the superpotential. The superconformal anomaly freedom of these models may be related to a naturally vanishing . The R charge of such models may also play a role in producing a generation-ordered fermion spectrum. \
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