Super Weyl invariance: BPS equations from heterotic worldsheets

Details Super Weyl invariance: BPS equations from heterotic worldsheets Super Weyl invariance: BPS equations from heterotic worldsheets

2012-03-30

arxiv.org/abs/1203.6827v2

Physics

High Energy Physics

High Energy Physics - Theory

1+31 pages LaTeX, 5 figures

Scientific paper

It is well-known that the beta functions on a string worldsheet correspond to the target space equations of motion, e.g. the Einstein equations. We show that the BPS equations, i.e. the conditions of vanishing supersymmetry variations of the space-time fermions, can be directly derived from the worldsheet. To this end we consider the RNS-formulation of the heterotic string with (2,0) supersymmetry, which describes a complex torsion target space that supports a holomorphic vector bundle. After a detailed account of its quantization and renormalization, we establish that the cancellation of the super Weyl anomaly implies the heterotic BPS conditions: At the one loop level the geometry is required to be conformally balanced and the gauge background has to satisfy the Hermitean Yang-Mills equations.

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