Instanton Cosmology and Domain Walls from M-theory and String Theory

Abstract

The recent proposal by Hawking and Turok for obtaining an open inflationary universe from singular instantons makes use of low-energy effective Lagrangians describing gravity coupled to scalars and non-propagating antisymmetric tensors. In this paper we derive some exact results for Lagrangians of this type, obtained from spherical compactifications of M-theory and string theory. In the case of the S^7 compactification of M-theory, we give a detailed discussion of the cosmological solutions. We also show that the lower-dimensional Lagrangians admit domain-wall solutions, which preserve one half of the supersymmetry, and which approach AdS spacetimes near their horizons.

arXiv comment51 pages, Latex (3 times). Discussion and references added

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• Universal Kaluza-Klein reductions of type IIB to N=4 supergravity in five dimensions
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• Interpolating from AdS_(D-2) X S^2 to AdS_D
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• Transient Quintessence from Group Manifold Reductions or how all roads lead to Rome
• Horava-Witten Stability: eppur si muove
• Anisotropic plasma with a chemical potential and scheme-independent instabilities
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• Holographic OPE Coefficients from AdS Black Holes with Matters
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• Hodge Duality on the Brane
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• Cyclic Inflation
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• Domain Walls and Massive Gauged Supergravity Potentials
• A dS obstruction and its phenomenological consequences
• Exact Embeddings of JT Gravity in Strings and M-theory
• Supersymmetric massive truncations of IIb supergravity on Sasaki-Einstein manifolds
• A supersymmetric Type IIB Randall-Sundrum realization
• Localised Gravity in the Singular Domain Wall Background?
• Randall-Sundrum Brane Tensions
• Consistent reductions from D=11 beyond Sasaki-Einstein
• Cosmology from Moduli Dynamics
• Stability of Horava-Witten Spacetimes
• Supersymmetry of consistent massive truncations of IIB supergravity
• Kaluza-Klein Induced Supersymmetry Breaking for Braneworlds in Type IIB Supergravity
• Domain Wall World(s)
• Thurston Geometries from Eleven Dimensions
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• Examples of naked singularity formation in higher-dimensional Einstein-vacuum spacetimes
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• Higher dimensional Kaluza-Klein Monopoles
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• Towards supersymmetric cosmology in M theory
• Inconsistency of Breathing Mode Extensions of Maximal Five-Dimensional Supergravity Embedding
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• State of the Unification Address
• Domain Walls in AdS-Einstein-scalar Gravity