A note on half-supersymmetric bound states in M-theory and type IIA

By using O(7, 7) transformations, to deform D6–branes, we obtain half-supersymmetric bound state solutions of type IIA supergravity, containing D6, D4, D2, D0, F1-branes and waves. We lift the solutions to M-theory which gives half-supersymmetric M-theory bound states, e.g. KK6–M5–M5–M5–M2–M2–M2–MW. We also take near horizon limits for the type IIA solutions, which gives supergravity duals of 7–dimensional noncommutative open string theory (with space-time and space-space non–commutativity), non–commutative Yang-Mills theory (with space-space and light-like non–commutativity) and an open D4–brane theory.