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On Time-dependent Backgrounds in Supergravity and String Theory | | Alex Buchel
; Peter Langfelder
; Johannes Walcher
; | | Date: |
24 Jul 2002 | | Journal: | Phys.Rev. D67 (2003) 024011 | | Subject: | hep-th | | 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. | | Source: | arXiv, hep-th/0207214 | | Services: | Forum | Review | PDF | Favorites | |
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