On Time-dependent Backgrounds in Supergravity and String Theory

Abstract

Time-dependent solutions of supergravity and string theory are studied. The examples are obtained from de Sitter deformation of gauge/gravity dualities, analytical continuation of static solutions, and ``exactly solvable'' worldsheet models. Among other things, it is shown that turning on a Hubble parameter in the background of a confining gauge theory in four dimensions can restore chiral symmetry. Some of the solutions obtained from analytical continuation have the interpretation of a universe with a bounce separating a big bang from a big crunch singularity. In the worldsheet context, it is argued why string propagation close to a Milne-type cosmological singularity might be physically non-singular.

38 pages, 1 figure, v2: refs added

References in corpus (3)

• Strings in Time-Dependent Orbifolds
• N=1 and N=2 Super Yang-Mills theories from wrapped branes
• Cosmological Spacetimes from Negative Tension Brane Backgrounds

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• Time Evolution via S-branes
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• Removing Singularities
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• S-branes and (Anti-)Bubbles in (A)dS Space
• The Tachyon does Matter
• Twisting S-branes
• The Taming of Closed Time-like Curves
• AdS/dS CFT Correspondence
• Gauge/string correspondence in curved space
• Backreaction and the rolling tachyon -- an effective action point of view
• Compactifications of the N=2^* flow
• Plane waves with weak singularities
• The Thermal Bath of de Sitter from Holography
• Entanglement entropy of $\mathcal{N}=2^{\ast }$ de Sitter vacuum
• The Schrödinger Wave Functional and S-branes
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• Non Supersymmetric Regular Solutions from Wrapped and Fractional Branes
• Localized Intersections of Non-Extremal p-branes and S-branes
• De Sitter Space in Gauge/Gravity Duality
• Causal Structure of d=5 Vacua and Axisymmetric Spacetimes
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