Results 11  20
of
76
Matrix Factorizations And Mirror Symmetry: The Cubic Curve
, 2004
"... We revisit open string mirror symmetry for the elliptic curve, using matrix factorizations for describing Dbranes on the Bmodel side. We show how flat coordinates can be intrinsically defined in the LandauGinzburg model, and derive the Amodel partition function counting disk instantons that stre ..."
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Cited by 32 (10 self)
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We revisit open string mirror symmetry for the elliptic curve, using matrix factorizations for describing Dbranes on the Bmodel side. We show how flat coordinates can be intrinsically defined in the LandauGinzburg model, and derive the Amodel partition function counting disk instantons that stretch between three Dbranes. In mathematical terms, this amounts to computing the simplest Fukaya product m2 from the LG mirror theory. In physics terms, this gives a systematic method for determining nonperturbative Yukawa couplings for intersecting brane configurations.
Realistic Yukawa structures from orientifold compactifications
, 2009
"... We perform a systematic analysis of globally consistent Dbrane quivers which realize the MSSM and analyze them with respect to their Yukawa couplings. Often, desired couplings are perturbatively forbidden due to the presence of global U(1) symmetries. We investigate the conditions under which Dbra ..."
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Cited by 25 (10 self)
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We perform a systematic analysis of globally consistent Dbrane quivers which realize the MSSM and analyze them with respect to their Yukawa couplings. Often, desired couplings are perturbatively forbidden due to the presence of global U(1) symmetries. We investigate the conditions under which Dbrane instantons will induce these missing couplings without generating other phenomenological drawbacks, such as Rparity violating couplings or a µterm which is too large. Furthermore, we systematically analyze which quivers allow for a mechanism that can account for the small neutrino masses and other experimentally observed hierarchies. We show that only a small fraction of the globally consistent Dbrane quivers
Open string wavefunctions in flux compactifications
, 2009
"... We consider compactifications of type I supergravity on manifolds with SU(3) structure, in the presence of RR fluxes and magnetized D9branes, and analyze the generalized Dirac and LaplaceBeltrami operators associated to the D9brane worldvolume fields. These compactifications are Tdual to standar ..."
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Cited by 18 (5 self)
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We consider compactifications of type I supergravity on manifolds with SU(3) structure, in the presence of RR fluxes and magnetized D9branes, and analyze the generalized Dirac and LaplaceBeltrami operators associated to the D9brane worldvolume fields. These compactifications are Tdual to standard type IIB toroidal orientifolds with NSNS and RR 3form fluxes and D3/D7 branes. By using techniques of representation theory and harmonic analysis, the spectrum of open string wavefunctions can be computed for Lie groups and their quotients, as we illustrate with explicit twisted tori examples. We find a correspondence between irreducible unitary representations of the KaloperMyers algebra and families of KaluzaKlein excitations. We perform the computation of 2 and 3point couplings for matter fields in the above flux compactifications, and compare our results with those of 4d effective supergravity.
Complete Gauge Threshold Corrections for Intersecting Fractional D6Branes:
, 2009
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A worldvolume perspective on the recombination of intersecting branes
 JHEP
"... Abstract: We study brane recombination for supersymmetric configurations of intersecting branes in terms of the worldvolume field theory. This field theory contains an impurity, corresponding to the degrees of freedom localized at the intersection. The Higgs branch, on which the impurity fields con ..."
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Cited by 15 (0 self)
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Abstract: We study brane recombination for supersymmetric configurations of intersecting branes in terms of the worldvolume field theory. This field theory contains an impurity, corresponding to the degrees of freedom localized at the intersection. The Higgs branch, on which the impurity fields condense, consists of vacua for which the intersection is deformed into a smooth calibrated manifold. We show this explicitly using a superspace formalism for which the calibration equations arise naturally from F and Dflatness. Keywords: Dbranes, Supersymmetric effective theories, brane dynamics in gauge theories, tachyon condensation. – 1 – Contents
Nonperturbative effects and Yukawa hierarchies
 in Ftheory SU(5) Unification, JHEP 1303
, 2013
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N = 1 and nonsupersymmetric open string theories in six and four spacetime dimensions
, 2003
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The Importance of Being Rigid: D6Brane Model Building on T
 6/Z2 × Z′6 with Discrete Torsion,” Nucl.Phys
, 2013
"... Model building with rigid D6branes on the Type IIA orientifold on T 6/Z2×Z′6 with discrete torsion is considered. The systematic search for models of particle physics is significantly reduced by proving new symmetries among different lattice orientations. Suitable rigid D6branes without matter in ..."
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Cited by 9 (4 self)
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Model building with rigid D6branes on the Type IIA orientifold on T 6/Z2×Z′6 with discrete torsion is considered. The systematic search for models of particle physics is significantly reduced by proving new symmetries among different lattice orientations. Suitable rigid D6branes without matter in adjoint and symmetric representations are classified, and SO(2N) and USp(2N) gauge factors on orientifold invariant D6branes are distinguished in terms of their discrete Wilson line and displacement parameters. Constraints on the nonexistence of exotic matter prohibit global completions of local MSSM and leftright symmetric models, while globally defined supersymmetric PatiSalam models are found. For the latter, only one particle generation possesses perturbative Yukawa couplings. Masses for the mild amount of exotic matter and the role of Abelian symmetries are briefly discussed. Last but not least, it is shown that for all three twotorus volumes of about the same order of magnitude, gauge coupling unification at oneloop can be achieved, while for highly unisotropic choices a low string scale in the TeV range is compatible with the observed strengths of gauge and gravitational couplings. ar X iv
N=1 Locally Supersymmetric Standard Models from Intersecting Branes”, hepth/0309070, Revised version
"... We construct four dimensional intersecting D6brane models that have locally the spectrum of the N=1 Supersymmetric Standard Model. All open visible string sectors share the same N=1 supersymmetry. As expected in these supersymmetric classes of models, where the D6branes wrap a toroidal orientifold ..."
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Cited by 8 (5 self)
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We construct four dimensional intersecting D6brane models that have locally the spectrum of the N=1 Supersymmetric Standard Model. All open visible string sectors share the same N=1 supersymmetry. As expected in these supersymmetric classes of models, where the D6branes wrap a toroidal orientifold of type IIA, the hierarchy may be stabilized if the string scale is low, e.g. below 30 TeV. We analyze the breaking of supersymmetry in the vicinity of the supersymmetric point by turning on complex structure deformations as FayetIliopoulos terms. Positive masses for all squarks and sleptons, to avoid charge/colour breaking minima, may be reached when also two loop contributions may be included. In the ultimate version of the present models N=1 supersymmetry may be broken by gauge mediation. The constructions with four, five and six stacks of D6branes at Ms are build directly. Next by the use of brane recombination we are able to show that there is a continuous, RR homology flow, between six, five and four stack models. Moreover, we examine the gauge coupling constants of the
Nonperturbative SQCD superpotentials from string instantons
, 2007
"... The Affleck–Dine–Seiberg instanton generated superpotential for SQCD with Nf = Nc − 1 flavours is explicitly derived from a local model of engineered intersecting D6branes with a single E2instanton. This computation extends also to symplectic gauge groups with Nf = Nc flavours. ..."
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Cited by 7 (1 self)
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The Affleck–Dine–Seiberg instanton generated superpotential for SQCD with Nf = Nc − 1 flavours is explicitly derived from a local model of engineered intersecting D6branes with a single E2instanton. This computation extends also to symplectic gauge groups with Nf = Nc flavours.