In this thesis we study string theory on orbifolds of AdS3. Non-extremal BTZ black holes have been shown to offer a good opportunity to study closed string tachyon condensation, as there are tachyons in the winding sector even in superstring theory. We study extremal BTZ black holes, both M = O and M = J from a world sheet perspective. The string spectrum is calculated within bosonic string theory and tachyons are identied within the spectrum. The at space limit of the M = 0 black hole is considered and an extension to superstring theory is discussed. In the second half of the thesis we discuss the self dual orbifold. The self dual orbifold is a simple example of a geometry which contains an AdS2 factor. AdS2 factors also appear in the near horizon limit of extremal Kerr and Reissner-Nordström black holes. Using the AdS/CFT correspondence we conjecture that the self dual orbifold is dual to a CFT on two distinct boundary regions and nd evidence to support this statement. We consider asymptotically self dual orbifold spacetimes, one of which is dual to a single copy of the groundstate of the CFT.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:534127 |
| Date | January 2011 |
| Creators | Parsons, James Duncan |
| Publisher | Durham University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://etheses.dur.ac.uk/846/ |
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