The d=6, N=1 heterotic string does not "live" in six dimensions
Andrea Gregori
Abstract
We discuss why the N6=1 heterotic string has to be viewed as something similar to a ``non-compact orbifold''. Only the perturbative spectrum is forced to satisfy the constraints imposed by the vanishing of six-dimensional anomalies. These do not apply to the states of the non-perturbative spectrum, such as those appearing when small instantons shrink to zero size.
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