We investigate self-similar solutions to the inverse mean curvature flow in Euclidean
space. Generalizing Andrews’ theorem that circles are the only compact homothetic
planar solitons, we apply the Hsiung–Minkowski integral formula to prove the rigidity
of the hypersphere in the class of compact expanders of codimension one. We also
establish that the moduli space of compact expanding surfaces of codimension two is
large. Finally, we update the list of Huisken–Ilmanen’s rotational expanders by
constructing new examples of complete expanders with rotational symmetry,
including topological hypercylinders, called
infinite bottles, that interpolate between
two concentric round hypercylinders.
Keywords
inverse mean curvature flow, self-similar solutions