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

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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

lim⁡i→∞∫M∣∇Kgi∣2 dg0=0.\lim_{i\rightarrow\infty}\int_M |\nabla K_{g_i}|^2\,d g_0=0.

Suppose there is exactly one bubble point p∈S2p\in S^2 and ui→−∞u_i\rightarrow-\infty on every compact subset Ω⊂M∖{p}\Omega\subset M\setminus\{p\}. For a fixed point q∈Ωq\in\Omega, set ci=ui(q)c_i=u_i(q). Flat-metric convergence conjecture. There exists a flat metric g∞=e2u∞g0g_\infty=e^{2u_\infty}g_0 on M∖{p}M\setminus\{p\} and a subsequence of gig_i such that, for every compact subset Ω⊂M∖{p}\Omega\subset M\setminus\{p\},

ui−ci⇀u∞in 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.

References

Primary source

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

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