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Lifting D-instanton zero modes by recombination and background fluxes

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We study the conditions under which D-brane instantons in Type II orientifold compactifications generate a non-perturbative superpotential. If the instanton is non-invariant under the orientifold action, it carries four instead of the two Goldstone fermions required for superpotential contributions....

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Bibliographic Details
Main Authors: Blumenhagen, Ralph (Author) , Weigand, Timo (Author)
Format: Article (Journal)
Language:English
Published: 30 October 2007
In: Journal of high energy physics
Year: 2007, Issue: 10
ISSN:1029-8479
DOI:10.1088/1126-6708/2007/10/098
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1088/1126-6708/2007/10/098
Verlag, kostenfrei, Volltext: http://stacks.iop.org/1126-6708/2007/i=10/a=098
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Author Notes:Ralph Blumenhagen, Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München, Germany; Mirjam Cvetic, Robert Richter and Timo Weigand, Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104-6396, U.S.A.
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Summary:We study the conditions under which D-brane instantons in Type II orientifold compactifications generate a non-perturbative superpotential. If the instanton is non-invariant under the orientifold action, it carries four instead of the two Goldstone fermions required for superpotential contributions. Unless these are lifted, the instanton can at best generate higher fermionic F-terms of Beasley-Witten type. We analyse two strategies to lift the additional zero modes. First we discuss the process of instantonic brane recombination in Type IIA orientifolds. We show that in some cases charge invariance of the measure enforces the presence of further zero modes which, unlike the Goldstinos, cannot be absorbed. In other cases, the instanton exhibits reparameterisation zero modes after recombination and a superpotential is generated if these are lifted by suitable closed or open string couplings. In the second part of the paper we address lifting the extra Goldstinos of D 3-brane instantons by supersymmetric three-form background fluxes in Type IIB orientifolds. This requires non-trivial gauge flux on the instanton. Only if the part of the fermionic action linear in the gauge flux survives the orientifold projection can the extra Goldstinos be lifted.
Item Description:Gesehen am 09.01.2018
Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1088/1126-6708/2007/10/098

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