Flat-metric convergence conjecture for degenerating conformal metrics on the 2-sphere

Let MM be a topological 22-sphere, and let gi=e2uig0g_i=e^{2u_i}g_0 be a family of conformal metrics with bounded area and energy. Assume

limiMKgi2dg0=0.\lim_{i\rightarrow\infty}\int_M |\nabla K_{g_i}|^2\,d g_0=0.

Suppose there is exactly one bubble point pS2p\in S^2 and uiu_i\rightarrow-\infty on every compact subset ΩM{p}\Omega\subset M\setminus\{p\}. For a fixed point qΩq\in\Omega, set ci=ui(q)c_i=u_i(q). Flat-metric convergence conjecture. There exists a flat metric g=e2ug0g_\infty=e^{2u_\infty}g_0 on M{p}M\setminus\{p\} and a subsequence of gig_i such that, for every compact subset ΩM{p}\Omega\subset M\setminus\{p\},

uiciuin H2,2(Ω).u_i-c_i\rightharpoonup u_\infty\quad\text{in }H^{2,2}(\Omega).

The conjecture describes the limiting geometry away from the unique concentration point when the curvature-gradient energy tends to zero. Its status is not determined by the supplied source context.

Sources & referencesView supporting material

Primary source

Xiuxiong Chen, “Calabi flow in Riemann surfaces revisited: A new point of view”, arXiv:math/0009246 (2000).

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