Tetsuji Kimura

Gauged Linear Sigma Model for Exotic Five-brane

We study an N = (4,4) supersymmetric gauged linear sigma model which gives rise to the nonlinear sigma model for multi-centered KK-monopoles. We find a new T-duality transformation of the model even in the presence of F-terms. Performing T-duality, we find the gauged linear sigma model whose IR limit describes the exotic 5 2 -brane with B-field.

Worldsheet instanton corrections to 52-brane geometry

A bstractWe study worldsheet instanton corrections to the exotic

D-branes and doubled geometry

5_2^2-\mathrm{brane}

World-volume effective actions of exotic five-branes

geometry in type II string theory. The BPS vortices in the

Worldsheet description of exotic five-brane with two gauged isometries

\mathcal{N}

Calabi-Yau manifolds of cohomogeneity one as complex line bundles

= (4, 4) gauged linear sigma model modify the geometry of the

Gauge Theoretical Construction of Non-compact Calabi–Yau Manifolds

5_2^2-\mathrm{brane}

Ricci flat Kahler manifolds from supersymmetric gauge theories

. We find that the modification of the geometry is understood by the localization in the T-dualized winding direction.

Spectrum of eleven-dimensional supergravity on a pp -wave background

We define the open string version of the nonlinear sigma model on doubled geometry introduced by Hull and Reid-Edwards, and derive its boundary conditions. These conditions include the restriction of D-branes to maximally isotropic submanifolds as well as a compatibility condition with the Lie algebra structure on the doubled space. We demonstrate a systematic method to derive and classify D-branes from the boundary conditions, in terms of embeddings both in the doubled geometry and in the physical target space. We apply it to the doubled three-torus with constant H-flux and find D0-, D1-, and D2-branes, which we verify transform consistently under T-dualities mapping the system to f-, Q- and R-flux backgrounds.

Canonical approach to Courant brackets for D-branes

A bstractWe construct world-volume effective actions of exotic 522