Supersymmetric Brane-Antibrane Systems: Matrix Model Description, Stability and Decoupling Limits

After reviewing the supertubes and super brane-antibrane systems in the context of matrix model, we look for more general higher-dimensional configurations that cannot be obtained by simple T-duality along the transverse directions of the tube. For D3-$\bar{\rm D3}$, we find a non-trivial configuration with $E\cdot B\neq 0$ and describe the worldvolume gauge theory. We present the string probe of D3-$\bar{\rm D3}$ system and study the decoupling limits leading to either noncommutative Super-Yang-Mills or NCOS theories with eight supercharges