English

Examples of compact embedded mean convex $\lambda$-hypersurfaces

Differential Geometry 2026-04-01 v1

Abstract

There is a well-known conjecture asserts that the round sphere should be the only compact embedded self-shrinker (i.e. 00-hypersurface) which is diffeomorphic to a sphere. S. Brendle confirmed the conjecture for 2-dimensional 00-hypersurfaces. For any dimensional λ\lambda-hypersurfaces, if λ<0\lambda<0, we constructed compact convex embedded λ\lambda-hypersurface which is diffeomorphic to a sphere and is not a round sphere. In this paper, for λ>0\lambda>0, we construct a compact mean convex embedded λ\lambda-hypersurface which is diffeomorphic to a sphere and is not a round sphere. In fact, for λ>0\lambda>0, there are no compact convex embedded λ\lambda-hypersurfaces which are diffeomorphic to spheres except a round sphere.

Keywords

Cite

@article{arxiv.2603.29371,
  title  = {Examples of compact embedded mean convex $\lambda$-hypersurfaces},
  author = {Qing-Ming Cheng and Junqi Lai and Guoxin Wei},
  journal= {arXiv preprint arXiv:2603.29371},
  year   = {2026}
}
R2 v1 2026-07-01T11:45:40.429Z