Anomalies, D-flatness and Small Instantons

Details Anomalies, D-flatness and Small Instantons Anomalies, D-flatness and Small Instantons

1995-12-22

arxiv.org/abs/hep-th/9512191v1

Phys.Lett. B378 (1996) 97-100

Physics

High Energy Physics

High Energy Physics - Theory

8 pages, harvmac

Scientific paper

10.1016/0370-2693(96)00342-5

Recently, Witten has proposed a mechanism for symmetry enhancement in $SO(32)$ heterotic string theory, where the singularity obtained by shrinking an instanton to zero size is resolved by the appearance of an $Sp(1)$ gauge symmetry. In this short letter, we consider spacetime constraints from anomaly cancellation in six dimensions and D-flatness and demonstrate a subtlety which arises in the moduli space when many instantons are shrunk to zero size.

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