Results 1  10
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44
Ibrane inflow and anomalous couplings on Dbranes
, 1997
"... We show that the anomalous couplings of Dbrane gauge and gravitational fields to RamondRamond tensor potentials can be deduced by a simple anomaly inflow argument applied to intersecting Dbranes and use this to determine the eightform gravitational coupling. May ..."
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Cited by 172 (11 self)
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We show that the anomalous couplings of Dbrane gauge and gravitational fields to RamondRamond tensor potentials can be deduced by a simple anomaly inflow argument applied to intersecting Dbranes and use this to determine the eightform gravitational coupling. May
Standard models from heterotic Mtheory
, 2000
"... We present a class of N = 1 supersymmetric models of particle physics, derived directly from heterotic Mtheory, that contain three families of chiral quarks and leptons coupled to the gauge group SU(3)C×SU(2)L×U(1)Y. These models are a fundamental form of “braneworld” theories, with an observable ..."
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Cited by 55 (17 self)
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We present a class of N = 1 supersymmetric models of particle physics, derived directly from heterotic Mtheory, that contain three families of chiral quarks and leptons coupled to the gauge group SU(3)C×SU(2)L×U(1)Y. These models are a fundamental form of “braneworld” theories, with an observable and hidden sector each confined, after compactification on a Calabi–Yau threefold, to a BPS threebrane separated by a fivedimensional bulk space with size of the order of the intermediate scale. The requirement of three families, coupled to the fundamental conditions of anomaly freedom and supersymmetry, constrains these models to contain additional fivebranes wrapped around holomorphic curves in the Calabi–Yau threefold. These fivebranes “live” in the bulk space and represent new, nonperturbative aspects of these particle physics vacua. We discuss, in detail, the relevant mathematical structure of a class of torusfibered Calabi–Yau threefolds with nontrivial first homotopy groups and construct holomorphic vector bundles over such threefolds, which, by including Wilson lines, break the gauge symmetry to the standard model gauge group. Rules for constructing phenomenological particle physics models in this context are presented and we give a number of explicit examples.
Lectures on NonBPS Dirichlet branes
, 2000
"... A comprehensive introduction to the boundary state approach to Dirichlet branes is given. Various examples of BPS and nonBPS Dirichlet branes are discussed. In particular, the nonBPS states in the duality of Type IIA on K3 and the heterotic string on T 4 are analysed in detail. ..."
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Cited by 54 (6 self)
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A comprehensive introduction to the boundary state approach to Dirichlet branes is given. Various examples of BPS and nonBPS Dirichlet branes are discussed. In particular, the nonBPS states in the duality of Type IIA on K3 and the heterotic string on T 4 are analysed in detail.
Magnetic Monopole Dynamics, Supersymmetry, and Duality
, 2006
"... We review the properties of BPS, or supersymmetric, magnetic monopoles, with an emphasis on their lowenergy dynamics and their classical and quantum bound states. After an overview of magnetic monopoles, we discuss the BPS limit and its relation to supersymmetry. We then discuss the properties and ..."
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Cited by 36 (2 self)
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We review the properties of BPS, or supersymmetric, magnetic monopoles, with an emphasis on their lowenergy dynamics and their classical and quantum bound states. After an overview of magnetic monopoles, we discuss the BPS limit and its relation to supersymmetry. We then discuss the properties and construction of multimonopole solutions with a single nontrivial Higgs field. The lowenergy dynamics of these monopoles is most easily understood in terms of the moduli space and its metric. We describe in detail several known examples of these. This is then extended to cases where the unbroken gauge symmetry include a nonAbelian factor. We next turn to the generic supersymmetric YangMills (SYM) case, in which several adjoint Higgs fields are present. Working first at the classical level, we describe the effects of these additional scalar fields on the monopole dynamics, and then include the contribution of the fermionic zero modes to the lowenergy dynamics. The resulting lowenergy effective theory is itself supersymmetric. We discuss the quantization of this theory and its quantum BPS states, which are typically composed of several loosely bound compact dyonic cores. We close with a discussion of the Dbrane realization of N = 4 SYM monopoles and dyons and explain the ADHMN construction of monopoles from the Dbrane point of view.
Building MSSM Flux Vacua
, 2008
"... We construct N = 1 and N = 0 chiral fourdimensional vacua of flux compactification in Type IIB string theory. These vacua have the common features that they are free of tadpole instabilities (both NSNS and RR) even for models with N = 0 supersymmetry. In addition, the dilaton/complex structure mod ..."
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Cited by 30 (4 self)
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We construct N = 1 and N = 0 chiral fourdimensional vacua of flux compactification in Type IIB string theory. These vacua have the common features that they are free of tadpole instabilities (both NSNS and RR) even for models with N = 0 supersymmetry. In addition, the dilaton/complex structure moduli are stabilised and the supergravity background metric is warped. We present an example in which the low energy spectrum contains the MSSM spectrum with three generations of chiral matter. In the N = 0 models, the background fluxes which stabilise the moduli also induce soft supersymmetry breaking terms in the gauge and chiral sectors of the theory, while satisfying the equation of motion. We also discuss some phenomenological features of these three generation MSSM flux vacua. Our techniques apply to other closed string backgrounds as well and, in fact, also allow to find new N = 1 Dbrane models which were believed not to exist. Finally, we discuss in detail the consistency conditions of these flux compactifications. Cancellation of Ktheory charges puts additional constraints on the consistency of the models, which render some chiral Dbrane models in the literature inconsistent.
The (p,q) String Tension in a Warped Deformed Conifold
, 2006
"... We find the tension spectrum of the bound states of p fundamental strings and q Dstrings at the bottom of a warped deformed conifold. We show that it can be obtained from a D3brane wrapping a 2cycle that is stabilized by both electric and magnetic fluxes. Because the Fstrings are ZMcharged wi ..."
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Cited by 25 (8 self)
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We find the tension spectrum of the bound states of p fundamental strings and q Dstrings at the bottom of a warped deformed conifold. We show that it can be obtained from a D3brane wrapping a 2cycle that is stabilized by both electric and magnetic fluxes. Because the Fstrings are ZMcharged with nonzero binding energy, binding can take place even if (p, q) are not coprime. Implications for cosmic strings are briefly discussed.
Black holes and solitons in string theory
"... We review various aspects of classical solutions in string theories. Emphasis is placed on their supersymmetry properties, their special roles in string dualities and microscopic interpretations. Topics include black hole solutions in string theories on tori and N = 2 supergravity theories; pbranes ..."
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Cited by 25 (0 self)
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We review various aspects of classical solutions in string theories. Emphasis is placed on their supersymmetry properties, their special roles in string dualities and microscopic interpretations. Topics include black hole solutions in string theories on tori and N = 2 supergravity theories; pbranes; microscopic interpretation of black hole entropy. We also review aspects of dualities and BPS states.
Tseytlin, Dbranes in curved spacetime: NappiWitten background, JHEP 9806
, 1998
"... Abstract. We find exact Dbrane configurations in the Nappi– Witten background using the boundary state approach and describe how they are related by Tduality transformations. We also show that the classical boundary conditions of the associated sigma model correspond to a field dependent automorph ..."
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Cited by 18 (2 self)
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Abstract. We find exact Dbrane configurations in the Nappi– Witten background using the boundary state approach and describe how they are related by Tduality transformations. We also show that the classical boundary conditions of the associated sigma model correspond to a field dependent automorphism relating the chiral currents and discuss the correspondence between the boundary state approach and the sigma model approach. 1.
Gas of DBranes and
 Hagedorn Density of BPS States, HUTP95/A042, hepth/9511088
"... We consider type IIA compactification on K3. We show that the instanton subsectors of the worldvolume of N 4branes wrapped around K3 lead to a Hagedorn density of BPS states in accord with heterotictype IIA duality in 6 dimensions. We also find evidence that the correct framework to understand the ..."
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Cited by 17 (1 self)
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We consider type IIA compactification on K3. We show that the instanton subsectors of the worldvolume of N 4branes wrapped around K3 lead to a Hagedorn density of BPS states in accord with heterotictype IIA duality in 6 dimensions. We also find evidence that the correct framework to understand the results of Nakajima on the appearance of affine KacMoody algebras on the cohomology of moduli space of instantons on ALE spaces is in the context of heterotictype IIA string duality. Dec. 1995One of the motivations behind the recent proposals of string dualities has been the appearance of field theory dualities, and in particular the MontonenOlive duality for N=4 YM theory. The existence of field theory dualities is a necessary condition to any generalization to string theory. There seems to be, however, another indirect, but perhaps deeper connection between the string duality and N = 4 YM duality. In [1] a strong coupling test of MontonenOlive Sduality was done. In particular SU(2), N = 4 YM on K3 was considered and it was found that the partition function of the theory is modular, in accord with Sduality. However, there was a surprising aspect to this computation: In the course of this computation the oscillator partition function of bosonic string theory