Instanton Induced Neutrino Majorana Masses in CFT Orientifolds with MSSM-like spectra
TLDR
In this article, the zero mode structure of D-brane instantons on general type II orientifold compactifications was analyzed, and it was shown that only instantons with O(1) symmetry can have just the two zero modes required to contribute to the 4d superpotential.Abstract:
Recently it has been shown that string instanton effects may give rise to neutrino Majorana masses in certain classes of semi-realistic string compactifications. In this paper we make a systematic search for supersymmetric MSSM-like Type II Gepner orientifold constructions admitting boundary states associated with instantons giving rise to neutrino Majorana masses and other L- and/or B-violating operators. We analyze the zero mode structure of D-brane instantons on general type II orientifold compactifications, and show that only instantons with O(1) symmetry can have just the two zero modes required to contribute to the 4d superpotential. We however discuss how the addition of fluxes and/or possible non-perturbative extensions of the orientifold compactifications would allowread more
Citations
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Model building with $F$-theory
Ron Donagi,Martijn Wijnholt +1 more
TL;DR: In this article, the authors extend the class of models by considering $F$-theory compactifications, which may incorporate unification more naturally, and derive the charged chiral spectrum and Yukawa couplings in $N = 1$ compactifications of $F $theory with $G$-flux.
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d-Brane Instantons in Type II Orientifolds
TL;DR: In this paper, the effects of d-brane instantons in supersymmetric compactifications of Type II string theory to four dimensions are reviewed and discussed, and concrete consequences of stringy instantons for the construction of semirealistic models of particle physics or supersymmetry breaking in compact and noncompact geometries are summarized.
Journal ArticleDOI
D-brane Instantons in Type II String Theory
TL;DR: In this paper, the effects of D-brane instantons in N = 1 supersymmetric compactifications of Type II string theory to four dimensions are discussed. But the focus is on the instanton sector.
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GUTs in Type IIB Orientifold Compactifications
TL;DR: In this paper, the authors systematically analyse globally consistent SU (5 ) GUT models on intersecting D7-branes in genuine Calabi-Yau orientifolds with O3-and O7-planes.
Posted Content
Model Building with F-Theory
Ron Donagi,Martijn Wijnholt +1 more
TL;DR: In this article, the authors extend the class of models by considering F-theory compactifications and derive the charged chiral spectrum and Yukawa couplings in N=1 compactifications of Ftheory with G-flux.
References
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Small instantons in string theory
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F-theory and orientifolds
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