Effective Actions near Singularities

Details Effective Actions near Singularities Effective Actions near Singularities

2003-01-17

arxiv.org/abs/hep-th/0301125v3

JHEP 0302 (2003) 053

Physics

High Energy Physics

High Energy Physics - Theory

33 pages, LaTeX. v2: cosmetic correction on titlepage. v3: references and note added

Scientific paper

10.1088/1126-6708/2003/02/053

We study the heterotic string compactified on K3 x T^2 near the line T=U, where the effective action becomes singular due to an SU(2) gauge symmetry enhancement. By `integrating in' the light W^\pm vector multiplets we derive a quantum corrected effective action which is manifestly SU(2) invariant and non-singular. This effective action is found to be consistent with a residual SL(2,Z) quantum symmetry on the line T=U. In an appropriate decompactification limit, we recover the known SU(2) invariant action in five dimensions.

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