6 papers
Twistor Spaces for QKT Manifolds
P. S. Howe, A. Opfermann, G. Papadopoulos
We find that the target space of two-dimensional (4,0) supersymmetric sigma models with torsion coupled to (4,0) supergravity is a QKT manifold, that is, a quaternionic Kähler mani…
HKT and OKT Geometries on Soliton Black Hole Moduli Spaces
G. W. Gibbons, G. Papadopoulos, K. S. Stelle
We consider Shiraishi's metrics on the moduli space of extreme black holes. We interpret the simplification in the pattern of N-body interactions that he observed in terms of the r…
Kappa-Symmetry, Supersymmetry and Intersecting Branes
E. Bergshoeff, R. Kallosh, T. Ortin +1
We present a new form of kappa-symmetry transformations for D-branes in which the dependence on the Born-Infeld field strength is expressed as a relative rotation on the left- and…
Superstring dualities and p-brane bound states
M. S. Costa, G. Papadopoulos
We show that the M-theory/IIA and IIA/IIB superstring dualities together with the diffeomorphism invariance of the underlying theories require the presence of certain p-brane bound…
(2,0)-supersymmetric sigma models and almost complex structures
G. Papadopoulos
We find a new class of (2,0)-supersymmetric two-dimensional sigma models with torsion and target spaces almost complex manifolds extending similar results for models with (2,2) sup…
Solitons in supersymmetric sigma-models with torsion
G. Papadopoulos, P. K. Townsend
We derive a bound on the energy of the general (p,q)-supersymmetric two-dimensional massive sigma model with torsion, in terms of the topological and Noether charges that appear as…