On Fractional Instanton Numbers in Six Dimensional Heterotic E_8 x E_8 Orbifolds

Details On Fractional Instanton Numbers in Six Dimensional Heterotic E_8 x E_8 Orbifolds On Fractional Instanton Numbers in Six Dimensional Heterotic E_8 x E_8 Orbifolds

2001-01-03

arxiv.org/abs/hep-th/0101023v1

Fortsch.Phys. 49 (2001) 455-458

Physics

High Energy Physics

High Energy Physics - Theory

Latex2e, 5 pages, contribution to the proceedings of the workshop ``The Quantum Structure of Spacetime and the Geometric Natur

Scientific paper

We show how the level matching condition in six dimensional, abelian and supersymmetric orbifolds of the E_8 x E_8 heterotic string can be given equivalently in terms of fractional gauge and gravitational instanton numbers. This relation is used to restate the classification of the orbifolds in terms of flat bundles away from the orbifold singularities under the constraint of the level matching condition. In an outlook these results are applied to Kaluza-Klein monopoles of the heterotic string on S^1 in Wilson line backgrounds.

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