Imperial College London

Professor Chris Hull FRS

Faculty of Natural SciencesDepartment of Physics

Chair in Theoretical Physics
 
 
 
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Contact

 

+44 (0)20 7594 7867c.hull Website

 
 
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Assistant

 

Mrs Graziela De Nadai-Sowrey +44 (0)20 7594 7843

 
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Location

 

602AHuxley BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

158 results found

Hull C, Marcus E, Stemerdink K, Vandoren Set al., 2020, Black holes in string theory with duality twists, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Chaemjumrus N, Hull CM, 2020, Special holonomy manifolds, domain walls, intersecting branes and T-folds, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Chaemjumrus N, Hull CM, 2019, The doubled geometry of nilmanifold reductions, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Gautier Y, Hull CM, Israel D, 2019, Heterotic/type II duality and non-geometric compactifications, The Journal of High Energy Physics, Vol: 214, Pages: 1-44, ISSN: 1029-8479

We present a new class of dualities relating non-geometric Calabi-Yau com- pactifications of type II string theory to T-fold compactifications of the heterotic string, both preserving four-dimensional N = 2 supersymmetry. The non-geometric Calabi-Yau space is a K 3 fibration over T2 with non-geometric monodromies in the duality group O(Γ4,20); this is dual to a heterotic reduction on a T4 fibration over T2 with the O(Γ4,20) monodromies now viewed as heterotic T-dualities. At a point in moduli space which is a minimum of the scalar potential, the type II compactification becomes an asymmetric Gepner model and the monodromies become automorphisms involving mirror symmetries, while the heterotic dual is an asymmetric toroidal orbifold. We generalise previous constructions to ones in which the automorphisms are not of prime order. The type II construction is perturbatively consistent, but the naive heterotic dual is not modular invariant. Modular invariance on the heterotic side is achieved by including twists in the circles dual to the winding numbers round the T2, and this in turn introduces non-perturbative phases depending on NS5-brane charge in the type II construction.

Journal article

Chaemjumrus N, Hull CM, 2019, Degenerations of K3, orientifolds and exotic branes, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull C, Szabo RJ, 2019, Noncommutative gauge theories on D-branes in non-geometric backgrounds, The Journal of High Energy Physics, Vol: 51, Pages: 1-41, ISSN: 1029-8479

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-energy effective description of D-branes on three-dimensional T-folds, examining both cases of parabolic and elliptic twists in detail. We give a detailed description of the decoupling limits and explore various physical consequences of the open string non-geometry. The T-duality monodromies of the non-geometric backgrounds lead to Morita duality monodromies of the noncommutative Yang-Mills theories induced on the D-branes. While the parabolic twists recover the well-known examples of noncommutative principal torus bundles from topological T-duality, the elliptic twists give new examples of noncommutative fibrations with non-geometric torus fibres. We extend these considerations to D-branes in backgrounds with R-flux, using the doubled geometry formulation, finding that both the non-geometric background and the D-brane gauge theory necessarily have explicit dependence on the dual coordinates, and so have no conventional formulation in spacetime.

Journal article

Abou-Zeid M, Hull CM, Lindstroem U, Rocek Met al., 2019, T-duality in (2,1) superspace, Journal of High Energy Physics, Vol: 2019, ISSN: 1029-8479

We find the T-duality transformation rules for 2-dimensional (2,1) supersymmetric sigma-models in (2,1) superspace. Our results clarify certain aspects of the (2,1) sigma model geometry relevant to the discussion of T-duality. The complexified duality transformations we find are equivalent to the usual Buscher duality transformations (including an important refinement) together with diffeomorphisms. We use the gauging of sigma-models in (2,1) superspace, which we review and develop, finding a manifestly real and geometric expression for the gauged action. We discuss the obstructions to gauging (2,1) sigma-models, and find that the obstructions to (2,1) T-duality are considerably weaker.

Journal article

Hull C, Lindström U, 2020, The Generalised Complex Geometry of (p, q) Hermitian Geometries, Communications in Mathematical Physics, ISSN: 0010-3616

Journal article

Giribet G, Hull C, Kleban M, Porrati M, Rabinovici Eet al., 2018, Superstrings on AdS(3) at k=1, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull CM, Israel D, Sarti A, 2017, Non-geometric Calabi-Yau backgrounds and K3 automorphisms, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull C, Lindstrom U, 2017, All (4,0): Sigma models with (4,0) off-shell supersymmetry, Journal of High Energy Physics, Vol: 2017, ISSN: 1029-8479

Off-shell (4, 0) supermultiplets in 2-dimensions are formulated. These are usedto construct sigma models whose target spaces are vector bundles over manifolds that arehyperk¨ahler with torsion. The off-shell supersymmetry implies that the complex structuresare simultaneously integrable and allows us to write actions using extended superspace andprojective superspace, giving an explicit construction of the target space geometries.

Journal article

Gaberdiel MR, Gopakumar R, Hull C, 2017, Stringy AdS(3) from the worldsheet, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull C, Lindstrom U, 2017, All (4,1): Sigma models with (4, q) off-shell supersymmetry, Journal of High Energy Physics, Vol: 2017, ISSN: 1029-8479

Off-shell (4, q) supermultiplets in 2-dimensions are constructed for q = 1, 2, 4.These are used to construct sigma models whose target spaces are hyperk¨ahler with torsion.The off-shell supersymmetry implies the three complex structures are simultaneouslyintegrable and allows us to construct actions using extended superspace and projectivesuperspace, giving an explicit construction of the target space geometries.

Journal article

Chaemjumrus N, Hull CM, 2016, Finite gauge transformations and geometry in extended field theory, Physical Review D, Vol: 93, ISSN: 2470-0010

The recently derived expressions for finite gauge transformations in double field theory with duality group O(d,d) are generalized to give expressions for finite gauge transformations for extended field theories with duality group SL(5,R), SO(5,5) and E6. The generalized metrics are discussed.

Journal article

Hull CM, 2015, Finite gauge transformations and geometry in double field theory, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull CM, Lambert N, 2014, Emergent time and the M5-brane, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull C, Lindstrom U, Rocek M, von Unge R, Zabzine Met al., 2012, Generalized Kahler geometry in (2,1) superspace, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hohm O, Hull C, Zwiebach B, 2010, Generalized metric formulation of double field theory, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull CM, Lindstrom U, Rocek M, von Unge R, Zabzine Met al., 2010, Generalized Calabi-Yau metric and generalized Monge-Ampere equation, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hohm O, Hull C, Zwiebach B, 2010, Background independent action for double field theory, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull CM, Lindstrom U, Rocek M, von Unge R, Zabzine Met al., 2009, Generalized Kahler geometry and gerbes, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull C, Zwiebach B, 2009, Double field theory, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull CM, Reid-Edwards RA, 2009, Non-geometric backgrounds, doubled geometry and generalised T-duality, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull CM, Reid-Edwards RA, 2009, Flux compactifications of string theory on twisted tori, FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS, Vol: 57, Pages: 862-894, ISSN: 0015-8208

Journal article

Hull C, Zwiebach B, 2009, The gauge algebra of double field theory and Courant brackets, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull CM, Lindstrom U, dos Santos LM, von Unge R, Zabzine Met al., 2009, Geometry of the N=2 supersymmetric sigma model with Euclidean worldsheet, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Abou-Zeid M, Hull CM, Mason LJ, 2008, Einstein supergravity and new twistor string theories, COMMUNICATIONS IN MATHEMATICAL PHYSICS, Vol: 282, Pages: 519-573, ISSN: 0010-3616

Journal article

Hull CM, Lindstrom U, dos Santos LM, von Unge R, Zabzine Met al., 2008, Topological sigma models with H-flux, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

Hull CM, Reid-Edwards RA, 2008, Gauge symmetry, T-duality and doubled geometry, JOURNAL OF HIGH ENERGY PHYSICS, Vol: 2008

Journal article

Hull CM, Lindstrom U, dos Santos LM, von Unge R, Zabzine Met al., 2008, Euclidean supersymmetry, twisting and topological sigma models, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

Journal article

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