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RR flux on Calabi–Yau and partial supersymmetry breaking
Abstract We show how turning on Flux for RR (and NS-NS) field strengths on non-compact Calabi–Yau 3-folds can serve as a way to partially break supersymmetry from N=2 to N=1 by mass deformation. TheExpand
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Topological amplitudes in string theory
We show that certain type II string amplitudes at genus g are given by the topological partition function Fg discussed recently by Bershadsky, Cecotti, Ooguri and Vafa. These amplitudes give rise toExpand
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Aspects of type I– type II– heterotic triality in four dimensions
We discuss the equivalence between Type I, Type II and Heterotic N = 2 superstring theories in four dimensions. We study the effective field theory of Type I models obtained by orientifold reductionsExpand
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Closed string amplitudes as single-valued open string amplitudes
We show that the single trace heterotic N-point tree-level gauge amplitude ANHET can be obtained from the corresponding type I amplitude ANI by the single-valued (sv) projection: ANHET=sv(ANI). ThisExpand
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Moduli stabilization in chiral type IIB orientifold models with fluxes
Abstract We consider type IIB orientifold models on Calabi–Yau spaces with three-form G-flux turned on. These fluxes freeze some of the complex structure moduli and the complex dilaton via an F-termExpand
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Supersymmetry relations and MHV amplitudes in superstring theory
Abstract We discuss supersymmetric Ward identities relating various scattering amplitudes in type I open superstring theory. We show that at the disk level, the form of such relations remains exactlyExpand
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The LHC string Hunter's companion
Abstract The mass scale of fundamental strings can be as low as few TeV / c 2 provided that spacetime extends into large extra dimensions. We discuss the phenomenological aspects of weakly coupledExpand
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Spontaneous breaking of N = 2 global supersymmetry
Abstract We study spontaneous supersymmetry breaking in N = 2 globally supersymmetric theories describing a system of abelian vector multiplets. We find that the most general form of the actionExpand
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N = 2 heterotic superstring and its dual theory in five dimensions
Abstract We study quantum effects in five dimensions in heterotic superstring theory compactified on K 3 × S 1 and analyze the conjecture that its dual effective theory is eleven-dimensionalExpand
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Perturbative QCD utilizing extended supersymmetry
We use N = 2 extended supersymmetry to dramatically simplify the diagrammatic calculations of perturbative QCD. The production, by gluon-gluon fusion, of two gluons, three gluons, and two masslessExpand
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