English

Low-energy $\alpha$-harmonic maps into the round sphere

Analysis of PDEs 2024-02-07 v2 Differential Geometry

Abstract

We classify low-energy α\alpha-harmonic maps from a closed non-spherical Riemannian surface Σ\Sigma of constant curvature to the round sphere via their bubble scales and centres. In particular we show that as 1<α11<\alpha\downarrow 1 and assuming EαE_\alpha is close to Σ+4π| \Sigma|+4\pi then degree-one α\alpha-harmonic maps blow a bubble based at a critical point aca_c of a an explicit function J\mathcal{J} and at scale J(ac)1(α1)\sqrt{ |\mathcal{J}(a_c)|^{-1}(\alpha-1)}. Up to a constant, J\mathcal{J} is the sum of the squares of any L2L^2-orthonormal basis of holomorphic one-forms on the domain.

Keywords

Cite

@article{arxiv.2402.02875,
  title  = {Low-energy $\alpha$-harmonic maps into the round sphere},
  author = {Ben Sharp},
  journal= {arXiv preprint arXiv:2402.02875},
  year   = {2024}
}

Comments

33 pages, minor typographical corrections

R2 v1 2026-06-28T14:38:19.965Z