Effective actions near singularities | Zendy

Jan Louis | Zendy; Thomas Mohaupt | Zendy; Marco Zagermann | Zendy

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Effective actions near singularities

Author(s) -

Jan Louis,

Thomas Mohaupt,

Marco Zagermann

Publication year - 2003

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2003/02/053

Subject(s) - gravitational singularity , heterotic string theory , effective action , invariant (physics) , mathematical physics , physics , symmetry (geometry) , quantum , action (physics) , string (physics) , quantum mechanics , mathematics , geometry

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 symmetryenhancement. By `integrating in' the light W^\pm vector multiplets we derive aquantum corrected effective action which is manifestly SU(2) invariant andnon-singular. This effective action is found to be consistent with a residualSL(2,Z) quantum symmetry on the line T=U. In an appropriate decompactificationlimit, we recover the known SU(2) invariant action in five dimensions.Comment: 33 pages, LaTeX. v2: cosmetic correction on titlepage. v3: references and note adde

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