The conjecture on strong convergence of the renormalized sequence

Let uku_k be the sequence considered in the blow-up argument, let NN_\infty be its limiting frequency, and define the renormalized sequence vkv_k so that vkvv_k\to v weakly in W1,2(B1)W^{1,2}(B_1). Here B1B1/2B_1\setminus B_{1/2} is the annulus between the unit ball and the ball of radius 1/21/2.

Strong-convergence conjecture. The renormalized sequence converges strongly:

vkvstrongly in W1,2(B1B1/2).v_k\longrightarrow v\quad\text{strongly in }W^{1,2}(B_1\setminus B_{1/2}).

Strong convergence would rule out loss of Dirichlet energy in the limiting blow-up argument and would support passing the relevant PDE information to the limit. The source explicitly notes that strong convergence is not clear and gives no resolution, so this conjecture remains open.

Sources & referencesView supporting material

Primary source

Dennis Kriventsov and Georg S. Weiss, “Rectifiability, finite Hausdorff measure, and compactness for non-minimizing Bernoulli free boundaries”, arXiv:2306.10131 (2024).

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