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New dimensions at a millimeter to a Fermi and superstrings at a TeV
Abstract Recently, a new framework for solving the hierarchy problem has been proposed which does not rely on low energy supersymmetry or technicolor. The gravitational and gauge interactions uniteExpand
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On the cosmological constant problem
Abstract We prove that Weyl invariant theories of gravity possess a remarkable property which, under very general assumptions, explains the stability of flat space-time. We show explicitly howExpand
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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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Journal of High Energy Physics Little string theory at a TeV
We propose a framework where the string scale as well as all compact dimensions are at the electroweak scale ∼ TeV−1. The weakness of gravity is attributed to the small value of the string couplingExpand
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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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String loop corrections to the universal hypermultiplet
We study loop corrections to the universal dilaton supermultiplet for type IIA strings compactified on Calabi-Yau threefolds. We show that the corresponding quaternionic kinetic terms receiveExpand
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R4 couplings in M- and type II theories on Calabi-Yau spaces
Abstract We discuss several implications of R4 couplings in M-theory when compactified on Calabi-Yau (CY) manifolds. In particular, these couplings can be predicted by supersymmetry from the mixedExpand
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A Possible new dimension at a few TeV
We examine the possibility of the existence of a large internal dimension at relatively low energies of the order of a few TeV. Such a dimension is a general prediction of perturbative stringExpand
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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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