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We review recent developments in duality symmetric string theory. We begin with the world sheet doubled formalism which describes strings in an extended space time with extra coordinates conjugate to winding modes. This formalism is Tduality symmetric and can accommodate nongeometric Tfold backgrounds which are beyond the scope of Riemannian geometry. Vanishing of the conformal anomaly of this theory can be interpreted as a set of spacetime equations for the background fields. These equations follow from an action principle that has been dubbed Double Field Theory (DFT). We review the aspects of generalised geometry relevant for DFT. We outline recent extensions of DFT and explain how, by relaxing the socalled strong constraint with a Scherk Schwarz ansatz, one can obtain backgrounds that simultaneously depend on both the regular and Tdual coordinates. This provides a purely geometric higher dimensional origin to gauged supergravities that arise from nongeometric compactification. We then turn to Mtheory and describe recent progress in formulating an E_{n(n)} Uduality covariant description of the dynamics. We describe how spacetime may be extended to accommodate coordinates conjugate to brane wrapping modes and the construction of generalised metrics in this extend space that unite the bosonic fields of supergravity into a single object. We review the action principles for these theories and their novel gauge symmetries. We also describe how a Scherk Schwarz reduction can be applied in the Mtheory context and the resulting relationship to the embedding tensor formulation of maximal gauged supergravities.
Originele taal2  English 

Pagina's (vantot)  160 
Tijdschrift  Physics Reports 
Volume  566 
DOI's  
Status  Published  2014 
Vingerafdruk
Duik in de onderzoeksthema's van 'Duality symmetric string and Mtheory'. Samen vormen ze een unieke vingerafdruk.Projecten
 1 Actief

SRP8: SRP (Zwaartepunt): HogeEnergiefysica
D'Hondt, J., Van Eijndhoven, N., Craps, B. & Buitink, S.
1/11/12 → 31/10/24
Project: Fundamenteel