Rotational symmetry of self-expanders to the inverse mean curvature flow   with cylindrical ends
  We show that any complete, immersed self-expander to the inverse mean curvature flow, which has one end asymptotic to a cylinder, or has two ends asymptotic to two coaxial cylinders, must be rotationally symmetric. 
Gregory Drugan, Frederick Tsz-Ho Fong, Hojoo Lee
math.DG