Time-dependent backgrounds in supergravity and string theory

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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 nonsingular.

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