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GUTs in Type IIB Orientifold Compactifications
, 2009
"... We systematically analyse globally consistent SU(5) GUT models on intersecting D7branes in genuine CalabiYau orientifolds with O3 and O7planes. Beyond the wellknown tadpole and Ktheory cancellation conditions there exist a number of additional subtle but quite restrictive constraints. For the ..."
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Cited by 4 (2 self)
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We systematically analyse globally consistent SU(5) GUT models on intersecting D7branes in genuine CalabiYau orientifolds with O3 and O7planes. Beyond the wellknown tadpole and Ktheory cancellation conditions there exist a number of additional subtle but quite restrictive constraints
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 26 (12 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
Generalized N = 1 Orientifold Compactifications and the Hitchin functionals
, 2006
"... The fourdimensional N = 1 supergravity theories arising in compactifications of type IIA and type IIB on generalized orientifold backgrounds with background fluxes are discussed. The Kähler potentials are derived for reductions on SU(3) structure orientifolds and shown to consist of the logarithm o ..."
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The fourdimensional N = 1 supergravity theories arising in compactifications of type IIA and type IIB on generalized orientifold backgrounds with background fluxes are discussed. The Kähler potentials are derived for reductions on SU(3) structure orientifolds and shown to consist of the logarithm
Mass Hierarchies from MSSM Orientifold Compactifications
, 2009
"... We investigate phenomenologically viable four and fivestack MSSM Dbrane quivers which exhibit realistic fermion mass hierarchies. In our analysis, the mass hierarchies arise either from higher order terms containing the VEV’s of SM singlets or from Dinstanton effects, where the latter utilizes e ..."
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We investigate phenomenologically viable four and fivestack MSSM Dbrane quivers which exhibit realistic fermion mass hierarchies. In our analysis, the mass hierarchies arise either from higher order terms containing the VEV’s of SM singlets or from Dinstanton effects, where the latter utilizes either family splitting or a factorizable Yukawa matrix. Extending the systematic bottomup analysis of [1], we present the only fourstack quiver with a semirealistic Yukawa texture. Investigation of fivestack MSSM models reveals many more quivers with analogous Yukawa textures, as well as a few examples which exhibit three different mass scales for the upquarks, downquarks, and electrons. Potential problems in this class of quivers are the presence of U(1) instantons, which might lead to undesired effects, such as Rparity violating couplings, and the presence of dimension 5 operators that could lead to rapid proton decay. We present a fivestack setup which overcomes all of these problems and exhibits three
The effective action of Dbranes in CalabiYau orientifold compactifications, Fortsch. Phys. 53
, 2005
"... In this review article 1 we study type IIB superstring compactifications in the presence of spacetime filling Dbranes while preserving N = 1 supersymmetry in the effective fourdimensional theory. This amount of unbroken supersymmetry and the requirement to fulfill the consistency conditions impos ..."
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Cited by 14 (0 self)
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imposed by the spacetime filling Dbranes lead to CalabiYau orientifold compactifications. For a generic CalabiYau orientifold theory with spacetime filling D3 or D7branes we derive the lowenergy spectrum. In a second step we compute the effective N = 1 supergravity action which describes
Hierarchies from Fluxes in String Compactifications
, 2002
"... Warped compactifications with significant warping provide one of the few known mechanisms for naturally generating large hierarchies of physical scales. We demonstrate that this mechanism is realizable in string theory, and give examples involving orientifold compactifications of IIB string theory a ..."
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Cited by 724 (33 self)
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Warped compactifications with significant warping provide one of the few known mechanisms for naturally generating large hierarchies of physical scales. We demonstrate that this mechanism is realizable in string theory, and give examples involving orientifold compactifications of IIB string theory
A note on the RG flow in (N = 1, D = 4) Supergravity and applications to Z3 orbifold/orientifold compactification
, 2000
"... We apply the standard approach of RG flow for the gauge couplings in N=1 D=4 Supergravity to show how to match its results with the heterotic Z3 orbifold and Type IIB Z3 orientifoldbased models. Using only supergravity, anomaly cancellation and the requirement of unification we determine the part o ..."
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We apply the standard approach of RG flow for the gauge couplings in N=1 D=4 Supergravity to show how to match its results with the heterotic Z3 orbifold and Type IIB Z3 orientifoldbased models. Using only supergravity, anomaly cancellation and the requirement of unification we determine the part
Orientifolds and Mirror symmetry
, 2003
"... We study parity symmetries and crosscap states in classes of N = 2 supersymmetric quantum field theories in 1+1 dimensions, including nonlinear sigma models, gauged WZW models, LandauGinzburg models, and linear sigma models. The parity anomaly and its cancellation play important roles in many of t ..."
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Cited by 277 (14 self)
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of them. The case of the N = 2 minimal model are studied in RCFT, and LG models. We also identify mirror pairs of orientifolds, extending the correspondence between symplectic geometry and algebraic geometry by including unorientable worldsheets. Through the analysis in various models and comparison
Matrix Compactification On Orientifolds
, 1998
"... Generalizing previous results for orbifolds, in this paper we describe the compactification of Matrix model on an orientifold which is a quotient space Rd /Γ as a YangMills theory living on a quantum space. The information of the compactification is encoded in the action of the discrete symmetry gr ..."
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Generalizing previous results for orbifolds, in this paper we describe the compactification of Matrix model on an orientifold which is a quotient space Rd /Γ as a YangMills theory living on a quantum space. The information of the compactification is encoded in the action of the discrete symmetry
Results 1  10
of
2,915