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Freely acting orbifolds of type IIB string theory on
George Gkountoumis, Chris Hull, Koen Stemerdink +1
We study freely acting orbifolds of type IIB string theory on that spontaneously break supersymmetry from to or 0 in five dimensions. We f…
Gravity, Duality and Conformal Symmetry
Chris Hull
The (4,0) supermultiplet in 6 dimensions contains a 4th rank tensor gauge field with the symmetries of the Riemann tensor and is superconformal, with 32+32 supersymmetries. Dimensi…
Homotopy Transfer and Effective Field Theory II: Strings and Double Field Theory
Alex S. Arvanitakis, Olaf Hohm, Chris Hull +1
We continue our study of effective field theory via homotopy transfer of -algebras, and apply it to tree-level non-Wilsonian effective actions of the kind discussed by Se…
Homotopy Transfer and Effective Field Theory I: Tree-level
Alex S. Arvanitakis, Olaf Hohm, Chris Hull +1
We use the dictionary between general field theories and strongly homotopy algebras to provide an algebraic formulation of the procedure of integrating out of degrees of freedom in…
Black holes in string theory with duality twists
Chris Hull, Eric Marcus, Koen Stemerdink +1
We consider 5D supersymmetric black holes in string theory compactifications that partially break supersymmetry. We compactify type IIB on and then further compactify on a ci…
Special Holonomy Manifolds, Domain Walls, Intersecting Branes and T-folds
N. Chaemjumrus, C. M. Hull
We discuss the special holonomy metrics of Gibbons, Lu, Pope and Stelle, which were constructed as nilmanifold bundles over a line by uplifting supersymmetric domain wall solutions…
Strong Kähler with Torsion as Generalised Geometry
Chris Hull, Ulf Lindström
Strong Kähler with Torsion is the target space geometry of and supersymmetric nonlinear sigma models. We discuss how it can be represented in terms of Generalised C…
Noncommutative gauge theories on D-branes in non-geometric backgrounds
Chris Hull, Richard J. Szabo
We investigate the noncommutative gauge theories arising on the worldvolumes of D-branes in non-geometric backgrounds obtained by T-duality from twisted tori. We revisit the low-en…
Non-geometric Calabi-Yau Backgrounds and K3 automorphisms
Chris Hull, Dan Israel, Alessandra Sarti
We consider compactifications of type IIA superstring theory on mirror-folds obtained as K3 fibrations over two-tori with non-geometric monodromies involving mirror symmetries. At…
All : Sigma Models with Off-Shell Supersymmetry
Chris Hull, Ulf Lindström
Off-shell supermultiplets in 2-dimensions are formulated. These are used to construct sigma models whose target spaces are vector bundles over manifolds that are hyperkähle…
Stringy AdS3 from the Worldsheet
Matthias R. Gaberdiel, Rajesh Gopakumar, Chris Hull
We investigate the behaviour of the bosonic string on AdS3 with H-flux at stringy scales, looking in particular for a `tensionless' limit in which there are massless higher spin ga…
All : Sigma Models with Off-Shell Supersymmetry
Chris Hull, Ulf Lindström
Off-shell supermultiplets in 2-dimensions are constructed for . These are used to construct sigma models whose target spaces are hyperkähler with torsion. The off-…
Generalized metric formulation of double field theory
Olaf Hohm, Chris Hull, Barton Zwiebach
The generalized metric is a T-duality covariant symmetric matrix constructed from the metric and two-form gauge field and arises in generalized geometry. We view it here as a metri…
Background independent action for double field theory
Olaf Hohm, Chris Hull, Barton Zwiebach
Double field theory describes a massless subsector of closed string theory with both momentum and winding excitations. The gauge algebra is governed by the Courant bracket in certa…
The gauge algebra of double field theory and Courant brackets
Chris Hull, Barton Zwiebach
We investigate the symmetry algebra of the recently proposed field theory on a doubled torus that describes closed string modes on a torus with both momentum and winding. The gauge…
Geometry of the N=2 supersymmetric sigma model with Euclidean worldsheet
C. M. Hull, U. Lindstrom, L. Melo dos Santos +2
We investigate the target space geometry of supersymmetric sigma models in two dimensions with Euclidean signature, and the conditions for N=2 supersymmetry. For a real action, the…
Generalized Kahler geometry and gerbes
C. M. Hull, U. Lindström, M. Roček +2
We introduce and study the notion of a biholomorphic gerbe with connection. The biholomorphic gerbe provides a natural geometrical framework for generalized Kahler geometry in a ma…
Euclidean Supersymmetry, Twisting and Topological Sigma Models
C. M. Hull, U. Lindstrom, L. Melo dos Santos +2
We discuss two dimensional N-extended supersymmetry in Euclidean signature and its R-symmetry. For N=2, the R-symmetry is SO(2)\times SO(1,1), so that only an A-twist is possible.…
Topological Sigma Models with H-Flux
C. M. Hull, U. Lindstrom, L. Melo dos Santos +2
We investigate the topological theory obtained by twisting the N=(2,2) supersymmetric nonlinear sigma model with target a bihermitian space with torsion. For the special case in wh…
T-duality, Gerbes and Loop Spaces
Dmitriy M. Belov, Chris M. Hull, Ruben Minasian
We revisit sigma models on target spaces given by a principal torus fibration , and show how treating the 2-form B as a gerbe connection captures the gauging obstructions a…
Einstein Supergravity and New Twistor String Theories
Mohab Abou-Zeid, Christopher M. Hull, Lionel J. Mason
A family of new twistor string theories is constructed and shown to be free from world-sheet anomalies. The spectra in space-time are calculated and shown to give Einstein supergra…
Global Aspects of T-Duality, Gauged Sigma Models and T-Folds
C. M. Hull
The gauged sigma-model argument that string backgrounds related by T-dual give equivalent quantum theories is revisited, taking careful account of global considerations. The topolo…
Flux Compactifications of M-Theory on Twisted Tori
C. M. Hull, R. A. Reid-Edwards
We find the bosonic sector of the gauged supergravities that are obtained from 11-dimensional supergravity by Scherk-Schwarz dimensional reduction with flux to any dimension D. We…
Flux Compactifications of String Theory on Twisted Tori
C. M. Hull, R. A. Reid-Edwards
Global aspects of Scherk-Schwarz dimensional reduction are discussed and it is shown that it can usually be viewed as arising from a compactification on the compact space obtained…