The chiral anomaly from M theory

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We argue that the chiral anomaly of = 1 super Yang-Mills theory admits a dual description as spontaneous symmetry breaking in M theory on G₂ holonomy manifolds. We identify an angle of the G₂ background dual to the anomalous U(1)ᵣ current in field theory. This angle is not an isometry of the metric and we therefore develop a theory of ``massive isometry'' to describe fluctuations about such angles. Another example of a massive isometry occurs in the Atiyah-Hitchin metric.