Advanced search    

Search: authors:"Yuho Sakatani"

5 papers found.
Use AND, OR, NOT, +word, -word, "long phrase", (parentheses) to fine-tune your search.

Effective action for non-geometric fluxes duality covariant actions

The (heterotic) double field theories and the exceptional field theories are manifestly duality covariant formulations, describing low-energy limit of various super-string and M-theory compactifications. These field theories are known to be reduced to the standard descriptions by introducing appropriately parameterized generalized metric and by applying suitably chosen section ...

Generalized gravity from modified DFT

Recently, generalized equations of type IIB supergravity have been derived from the requirement of classical kappa-symmetry of type IIB superstring theory in the Green-Schwarz formulation. These equations are covariant under generalized T -duality transformations and hence one may expect a formulation similar to double field theory (DFT). In this paper, we consider a modification ...

Exotic branes and non-geometric fluxes

We present and study ten-dimensional effective actions for various nongeometric fluxes of which exotic branes act as the magnetic sources. Each theory can be regarded as a U-dual version of the β-supergravity, a reformulation of the ten-dimensional supergravity which is suitable for describing non-geometric backgrounds with Q-flux. In each theory, we find a solution that ...

Defect branes as Alice strings

There exist various defect-brane backgrounds in supergravity theories which arise as the low energy limit of string theories. These backgrounds typically have non-trivial monodromies, and if we move a charged probe around the center of a defect, its charge will be changed by the action of the monodromy. During the process, the charge conservation law seems to be violated. In this ...

O(D, D) covariant Noether currents and global charges in double field theory

Double field theory is an approach for massless modes of string theory, unifying and geometrizing all gauge invariance in manifest O(D, D) covariant manner. In this approach, we derive off-shell conserved Noether current and corresponding Noether potential associated with unified gauge invariance. We add Wald-type counter two-form to the Noether potential and define conserved ...