cam a22 4 4500 56927673X CHVBK 20201202100955.0 190725s2018 sz a m 00 0deng d urn:nbn:ch:bel-1617631 urn (SNL)991017971610103976 (SNL)991018075243303976 (NEBIS)011435834 (Sz)991017971610103976 (Sz)991018075243303976 Sz ger rda eng eng fre 530 23sdnb Ferreira Kevin 1990- (DE-588)1188626132 Verfasser aut The emergence of higher-spins in string theory from a worldsheet perspective presented by Kevin P. Ferreira Zurich 2018 viii, 183 Seiten Illustrationen 30 cm Dissertation No. 25462 ETH Zurich, 2018 Literaturverzeichnis application/pdf The tensionless regime of string theory is exp ected to exhibit a large unbroken symmetry which is hidden at lower energies. This prosp ect has b een addressed in the context of b oth AdS4/CFT3 and AdS3/CFT2 correspondences, where the holographic dualities mediate in a manageable way the emergence of (enhanced) higher-spin symmetries. We start by extensively reviewing the AdS3/CFT2 case and isolating an even-spin subsector of string massless higher-spin states. We then organise and begin the program of understanding these emergent symmetries from a purely string-theoretic point of view. The main di culty in this program is that the dual CFT description of strings in AdS3 is located at a point in moduli space for which there is no general covariant string description. In particular, the spacetime-covariant worldsheet theory cannot accommodate for the presence of background R-R uxes without the break of locality. We therefore initiate the program at the point with pure NS-NS ux, which does admit a covariant worldsheet description as a WZW-model, while keeping the holographic results as a guideline. As expected we do not nd massless higher-spin elds at this point, except at unit level where a special class of continuous representations becomes massless. We also isolate an even-spin discrete subsector of the leading Regge trajectory, which is a suitable candidate to correspond to the previously isolated massless higher-spin elds. We then proceed to present a (partially) covariant worldsheet description away from this point, with the help of the hybrid formalism. This formalism has its own inconveniences and technical di culties, which we report in detail, and which prevent us from computing the full string spectrum. These di culties can be lifted in a large-charge limit, in which the full worldsheet spectrum is shown to reproduce the plane-wave spectrum of string theory with mixed ux. Finally, we derive some consequences for the full string spectrum from some partial computations: we retrieve a set of BPS states which were missing from the pure NS-NS spectrum, and we show that long strings become non-unitary. Englischer Text mit englischer und französischer Zusammenfassung KONFORME FELDTHEORIE (QUANTENTHEORIE) ger (ETHUDK)000059554 ethudk MATHEMATISCHE PHYSIK ger (ETHUDK)000012468 ethudk STRING- UND SUPERSTRINGTHEORIEN (QUANTENTHEORIE) ger (ETHUDK)000014290 ethudk SYMMETRIEN UND ERHALTUNGSSÄTZE (TEILCHENPHYSIK) ger (ETHUDK)000015354 ethudk Hochschulschrift (DE-588)4113937-9 gnd-content Hochschulschrift gnd-content sb 2019/15 530 zh snl-sb xehelv xediss 2020 530 snl ehelv u STRING- UND SUPERSTRINGTHEORIEN (QUANTENTHEORIE) ger 530.145.1*5 nebis E1 u MATHEMATISCHE PHYSIK ger 51-73 nebis E1 u KONFORME FELDTHEORIE (QUANTENTHEORIE) ger 530.145,2*1 nebis E1 u SYMMETRIEN UND ERHALTUNGSSÄTZE (TEILCHENPHYSIK) ger 539.121.7,5 nebis E1 u THÉORIE DES CORDES ET DES SUPERCORDES (MÉCANIQUE QUANTIQUE) fre 530.145.1*5 nebis E1 u STRING AND SUPERSTRING THEORIES (QUANTUM MECHANICS) eng 530.145.1*5 nebis E1 u MATHEMATICAL PHYSICS eng 51-73 nebis E1 u PHYSIQUE MATHÉMATIQUE fre 51-73 nebis E1 u CONFORMAL FIELD THEORY (QUANTUM THEORY) eng 530.145,2*1 nebis E1 u THÉORIE DES CHAMPS CONFORMES (THÉORIE QUANTIQUE) fre 530.145,2*1 nebis E1 u SYMÉTRIES ET LOIS DE CONSERVATION (PHYSIQUE DES PARTICULES ÉLÉMENTAIRES) fre 539.121.7,5 nebis E1 u SYMMETRIES AND CONSERVATION LAWS (PARTICLE PHYSICS) eng 539.121.7,5 nebis E1 Eidgenössische Technische Hochschule Zürich (DE-588)2023928-2 Grad-verleihende Institution dgg SNL NB001 NB999 - chb99 - https://opac.admin.ch/toc/toc1902090123.pdf Inhaltsverzeichnis BK020300 XK020000 XK020000 141 E01-20190624 148 E01-20190624 SNL NB001 NB001 Nbq 121746 NB10010 NEBIS E16 E16 RH Diss ETH 25462 SNL 100 1- Ferreira Kevin 1990- (DE-588)1188626132 Verfasser aut SNL 856 41 https://opac.admin.ch/toc/toc1902090123.pdf Inhaltsverzeichnis SNL 710 2- Eidgenössische Technische Hochschule Zürich (DE-588)2023928-2 Grad-verleihende Institution dgg SNL 100 1- Ferreira Kevin Verfasser aut SNL 856 40 http://hdl.handle.net/20.500.11850/315324 SNL 856 4- https://nbn-resolving.org/urn:nbn:ch:bel-1617631 SNL 856 42 http://www.e-helvetica.nb.admin.ch/directAccess?callnumber=bel-1617631 NEBIS 100 1- Ferreira Kevin 1990- (DE-588)1188626132 Verfasser aut NEBIS 700 1- Gaberdiel Matthias 1966- (DE-588)1089341946 Akademischer Betreuer dgs NEBIS 700 1- Beisert Niklas 1977- (DE-588)1090275323 Akademischer Betreuer dgs