Jian-Ge Zhou

Learn More
The super 0-brane and GS superstring actions on AdS2 × S background with 2form flux are constructed by supercoset approach. We find the super 0-brane action contains two parameters which are interpreted as the electric and magnetic charges of the super 0-brane. The obtained super 0-brane action describes the BPS saturated dyonic superparticle moving on AdS2(More)
We study the creation of a fundamental string between D4-branes at angles in string theory. It is shown that R(−1) part of the one-loop potential of open string changes its sign due to the change of fermionic zero-mode vacua when the branes cross each other. As a result the effective potential is independent of the angles when supersymmetry is partially(More)
Gluing conditions are proposed to characterize the D-branes in gauged WZW models. From them the boundary conditions for the group-valued and the subgroup-valued fields are determined. We construct a gauged WZW action for open strings that coincides classically with those written previously, when the gluing conditions are imposed. This action is also used to(More)
We construct the string states |OJ p >J , |OJ1 q >J1J2 and |O12 0 >J1J2 in the Hilbert space of the quantum mechanical orbifold model so as to calculate the three point functions and the matrix elements of the light-cone Hamiltonian from the interacting string bit model. With these string states we show that the three point functions and the matrix elements(More)
Background independence of noncommutative Yang-Mills theory on R is discussed. The quantity θF̂ θ − θ is found to be background dependent at subleading order, and it becomes background independent only when the ordinary gauge field strength F is constant. It is shown that, at small values of B, the noncommutative Dirac-Born-Infeld action possesses(More)
The partition function in Matrix theory is constructed by Euclidean path integral method. The D0-branes, which move around in the finite region with a typical size of Schwarzschild radius, are chosen as the background. The mass and entropy of the system obtained from the partition function contain the parameters of the background. After averaging the mass(More)
We discuss possible D-brane configurations on SU(2) group manifold in the sigma model approach. When we turn the boundary conditions of the spacetime fields into the boundary gluing conditions of chiral currents, we find that for all D-branes except the spherical D2-branes, the gluing matrices Rab depend on the fields, so the chiral Kac-Moody symmetry is(More)