{"id":{"repo_id":"durham","oai_identifier":"oai:etheses.durham.ac.uk:846"},"canonical_url":"https://search.dev.ndltd.org/etd/durham/oai:etheses.durham.ac.uk:846","repository":{"repo_id":"durham","name":"Durham University","base_url":"http://etheses.dur.ac.uk/cgi/oai2"},"display":{"title":"Black holes with a twist","abstract":"In this thesis we study string theory on orbifolds of AdS3. Non-extremal BTZ black holes have been shown to oer 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 = 0 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-Nordstr�om 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.","abstract_html":"In this thesis we study string theory on orbifolds of AdS3. Non-extremal BTZ black holes have been shown to oer 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 = 0 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-Nordstr�om 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.","abstract_has_math":false,"creators":["Parsons, James Duncan"],"institution":"Durham University","degree_name":"PhD","degree_level":"doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011","date_published":"2011","updated_at":"2026-07-24T02:11:17Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Parsons, James Duncan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011"]},{"key":"dc:date.issued","label":"Date","values":["2011"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Mathematical Sciences, Department of"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["Durham University"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://etheses.durham.ac.uk/id/eprint/846/"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["PhD"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://etheses.durham.ac.uk/id/eprint/846/1/thesis.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["In this thesis we study string theory on orbifolds of AdS3. Non-extremal BTZ black holes have been shown to oer 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 = 0 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-Nordstr�om 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."]},{"key":"dc:format","label":"Dc Format","values":["text"]},{"key":"dc:title","label":"Title","values":["Black holes with a twist"]}]}],"canonical_facts":{"dc:creator":["Parsons, James Duncan"],"dc:date":["2011"],"dc:date.issued":["2011"],"dc:description.abstract":["In this thesis we study string theory on orbifolds of AdS3. Non-extremal BTZ black holes have been shown to oer 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 = 0 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-Nordstr�om 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."],"dc:format":["text"],"dc:identifier.uri":["https://etheses.durham.ac.uk/id/eprint/846/1/thesis.pdf"],"dc:publisher.department":["Mathematical Sciences, Department of"],"dc:publisher.institution":["Durham University"],"dc:relation.isreferencedby":["https://etheses.durham.ac.uk/id/eprint/846/"],"dc:title":["Black holes with a twist"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["doctoral"],"dc:type.qualificationname":["PhD"]},"updated_at":"2026-07-24T02:11:17Z"}