On Time-dependent Backgrounds in Supergravity and String Theory

Details On Time-dependent Backgrounds in Supergravity and String Theory On Time-dependent Backgrounds in Supergravity and String Theory

2002-07-23

arxiv.org/abs/hep-th/0207214v2

Phys.Rev. D67 (2003) 024011

Physics

High Energy Physics

High Energy Physics - Theory

38 pages, 1 figure, v2: refs added

Scientific paper

10.1103/PhysRevD.67.024011

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.

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