26 research outputs found
Giant magnons of string theory in the lambda background
The analogues of giant magnon configurations are studied on the string world
sheet in the lambda background. This is a discrete deformation of the
AdS(5)xS(5) background that preserves the integrability of the world sheet
theory. Giant magnon solutions are generated using the dressing method and
their dispersion relation is found. This reduces to the usual dyonic giant
magnon dispersion relation in the appropriate limit and becomes relativistic in
another limit where the lambda model becomes the generalized sine-Gordon theory
of the Pohlmeyer reduction. The scattering of giant magnons is then shown in
the semi-classical limit to be described by the quantum S-matrix that is a
quantum group deformation of the conventional giant magnon S-matrix. It is
further shown that in the small g limit, a sector of the S-matrix is related to
the XXZ spin chain whose spectrum matches the spectrum of magnon bound states.Comment: 53 pages, 6 figures, final version to appear in JHE
D-branes in λ-deformations
We show that the geometric interpretation of D-branes in WZW models as twisted conjugacy classes persists in the --deformed theory. We obtain such configurations by demanding that a monodromy matrix constructed from the Lax connection of the --deformed theory continues to produce conserved charges in the presence of boundaries. In this way the D-brane configurations obtained correspond to ``integrable'' boundary configurations. We illustrate this with examples based on and , and comment on the relation of these D-branes to both non-Abelian T-duality and Poisson-Lie T-duality. We show that the D2 supported by D0 charge in the --deformed theory map, under analytic continuation together with Poisson-Lie T-duality, to D3 branes in the -deformation of the principal chiral model
Development of a method of producing infiltrated low-porosity tubular powder components
Translated from Russian (Poroshkovaya metallurgiya 1998 (9-10) p. 110-113)Available from British Library Document Supply Centre-DSC:9023.190(9884)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo