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The Ekpyrotic universe: Colliding branes and the origin of the hot big bang
We propose a cosmological scenario in which the hot big bang universe is produced by the collision of a brane in the bulk space with a bounding orbifold plane, beginning from an otherwise cold,Expand
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From big crunch to big bang
We consider conditions under which a universe contracting towards a big crunch can make a transition to an expanding big bang universe. A promising example is 11-dimensional M-theory in which theExpand
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The Universe as a domain wall
It is shown that the effective five-dimensional theory of the strongly coupled heterotic string is a gauged version of N=1 five-dimensional supergravity with four-dimensional boundaries. For theExpand
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Heterotic M-theory in five dimensions
Abstract We derive the five-dimensional effective action of strongly coupled heterotic string theory for the complete (1,1) sector of the theory by performing a reduction, on a Calabi-Yau three-fold,Expand
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On the four-dimensional effective action of strongly coupled heterotic string theory
Abstract The low-energy D = 4, N = 1 effective action of the strongly coupled heterotic string is explicitly computed by compactifying the Hořava-Witten theory on the deformed Calabi-Yau three-foldExpand
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Supersymmetry, supergravity, and particle physics
N = 1 global supersymmetry and supergravity are discussed using the superfield formalism. Supergravity particle physics theories are presented, emphasizing the role of gravitation in low energyExpand
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New Ekpyrotic Cosmology
In this paper, we present a new scenario of the early universe that contains a pre-big bang ekpyrotic phase. By combining this with a ghost condensate, the theory explicitly violates the null energyExpand
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Higher-derivative chiral superfield actions coupled to N = 1 supergravity
We construct N=1 supergravity extensions of scalar field theories with higher-derivative kinetic terms. Special attention is paid to the auxiliary fields, whose elimination leads not only toExpand
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Standard Models from Heterotic M-theory
We present a class of N=1 supersymmetric models of particle physics, derived directly from heterotic M-theory, that contain three families of chiral quarks and leptons coupled to the gauge groupExpand
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The Particle Spectrum of Heterotic Compactifications
Techniques are presented for computing the cohomology of stable, holomorphic vector bundles over elliptically fibered Calabi-Yau threefolds. These cohomology groups explicitly determine the spectrumExpand
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