New instanton effects in string theory | Zendy

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New instanton effects in string theory

Author(s) -

Chris Beasley,

Edward Witten

Publication year - 2006

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 - 10.1088/1126-6708/2006/02/060

Subject(s) - worldsheet , instanton , compactification (mathematics) , superpotential , physics , heterotic string theory , moduli space , moduli , effective action , theoretical physics , orientifold , mathematical physics , string theory , supersymmetry , quantum electrodynamics , particle physics , quantum mechanics , pure mathematics , string field theory , mathematics

We describe a new class of instanton effects in string compactifications thatpreserve only N=1 supersymmetry in four dimensions. As is well-known,worldsheet or brane instantons in such a background can sometimes contribute toan effective superpotential for the moduli of the compactification. Wegeneralize this phenomenon by showing that such instantons can also contributeto new multi-fermion and higher-derivative F-terms in the low-energy effectiveaction. We consider in most detail the example of heterotic compactification ona Calabi-Yau threefold X with gauge bundle V, in which case we study worldsheetinstanton effects that deform the complex structure of the moduli spaceassociated to X and V. We also give new, slightly more economical derivationsof some previous results about worldsheet instantons in Type IIA Calabi-Yaucompactifications.Comment: 49 pages, harvmac, v2: references adde

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