Article
String winding modes from charge nonconservation in compact ChernSimons theory
Theoretical Physics, 1 Keble Road, Oxford, OX1 3NP, UK
Physics Letters B (Impact Factor: 4.57). 01/1997; DOI: 10.1016/S03702693(96)016929 Source: arXiv

Article: Strings, Gauge Fields and Membranes
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ABSTRACT: We present an overview of the intimate relationship between string and Dbrane dynamics, and the dynamics of gauge and gravitational fields in three spacetime dimensions. The successes, prospects and open problems in describing both perturbative and nonperturbative aspects of string theory in terms of threedimensional quantum field theory are highlighted.07/2004;  [Show abstract] [Hide abstract]
ABSTRACT: We continue the development of the topological membrane approach to open and unoriented string theories. We study orbifolds of topologically massive gauge theory defined on the geometry $[0,1]\times\Sigma$, where $\Sigma$ is a generic compact Riemann surface. The orbifold operations are constructed by gauging the discrete symmetries of the bulk threedimensional field theory. Multiloop bosonic string vacuum amplitudes are thereby computed as bulk correlation functions of the gauge theory. It is shown that the threedimensional correlators naturally reproduce twisted and untwisted sectors in the case of closed worldsheet orbifolds, and Neumann and Dirichlet boundary conditions in the case of open ones. The bulk wavefunctions are used to explicitly construct the characters of the underlying extended KacMoody group for arbitrary genus. The correlators for both the original theory and its orbifolds give the expected modular invariant statistical sums over the characters. Comment: 47 pages LaTeX, 3 figures, uses amsfonts and epsfig; v2: Typos corrected, reference added, clarifying comments on modular invariance inserted; v3: Further comments on modular invariance added; to be published in JHEPJournal of High Energy Physics 12/2001; · 5.62 Impact Factor 
Article: Dbranes in topological membranes
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ABSTRACT: It is shown how twodimensional states corresponding to Dbranes arise in orbifolds of topologically massive gauge and gravity theories. Brane vertex operators naturally appear in induced worldsheet actions when the threedimensional gauge theory is minimally coupled to external charged matter and the orbifold relations are carefully taken into account. Boundary states corresponding to Dbranes are given by vacuum wavefunctionals of the gauge theory in the presence of the matter, and their various constraints, such as the Cardy condition, are shown to arise through compatibility relations between the orbifold charges and bulk gauge invariance. We show that with a further conformallyinvariant coupling to a dynamical massless scalar field theory in three dimensions, the brane tension is naturally set by the bulk mass scales and arises through dynamical mechanisms. As an auxilliary result, we show how to describe string descendent states in the threedimensional theory through the construction of gaugeinvariant excited wavefunctionals.Nuclear Physics B 08/2003; · 4.33 Impact Factor
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