Phase Moduli Space of Supertubes
  We study possible deformations of BPS supertubes keeping their conserved charges fixed. We show that there is no flat direction to closed supertubes of circular cross section with uniform electric and magnetic fields, and also to open planar supertubes. We also find that there are continuously infinite flat deformations to supertubes of general shape under certain conditions. 
Dongsu Bak, Yoshifumi Hyakutake and Nobuyoshi Ohta