Universality properties of N=2 and N=1 Heterotic threshold corrections

Details Universality properties of N=2 and N=1 Heterotic threshold corrections Universality properties of N=2 and N=1 Heterotic threshold corrections

1996-08-07

arxiv.org/abs/hep-th/9608034v1

Nucl.Phys. B483 (1997) 141-171

Physics

High Energy Physics

High Energy Physics - Theory

30 pages, Latex2e, one figure included

Scientific paper

10.1016/S0550-3213(96)00550-0

In the framework of heterotic compactifications, we consider the one-loop corrections to the gauge couplings, which were shown to be free of any infra-red ambiguity. For a class of N=2 models, namely those that are obtained by toroidal compactification to four dimensions of generic six-dimensional N=1 ground states, we give an explicit formula for the gauge-group independent thresholds, and show that these are equal within this class, as a consequence of an anomaly-cancellation constraint in six dimensions. We further use these results to compute the (N=2)-sector contributions to the thresholds of N=1 orbifolds. We then consider the full contribution of N=1 sectors to the gauge couplings which generically are expected to modify the unification picture. We compute such corrections in several models. We finally comment on the effect of such contributions to the issue of string unification.

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