The eigenvalue problem for the $$\infty $$-Bilaplacian
The eigenvalue problem for the $$\infty $$-Bilaplacian
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$$infty $$-Bilaplacian 的特征值问题
DOI:
10.1007/s00030-017-0492-4
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Katzourakis N
中科院分区:
文献类型:
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作者:
Katzourakis N
We consider the problem of finding and describing minimisers of the Rayleigh quotient Λ _ ∞\,:=\,\inf _ u ∈ W^ 2, ∞ (Ω) ∖ {0\} ‖ Δ u ‖ _ L^ ∞ (Ω) ‖ u ‖ _ L^ ∞ (Ω), Λ∞:= inf u∈ W 2,∞(Ω){0‖ Δ u‖ L∞(Ω)‖ u‖ L∞(Ω), where Ω ⊆ R^ n Ω⊆ R n is a bounded C^ 1, 1 C 1, 1 domain and W^ 2, ∞ (Ω) W 2,∞(Ω) is a class of weakly twice differentiable functions satisfying either u= 0 u= 0 on ∂ Ω∂ Ω or u=| D u|= 0 u=| D u|= 0 on ∂ Ω∂ Ω. Our first main result, obtained through approximation by L^ p L p-problems as p → ∞ p→∞, is the existence of a minimiser u_ ∞ ∈ W^ 2, ∞ (Ω) u∞∈ W 2,∞(Ω) satisfying aligned\left {array ll Δ u_ ∞\, ∈\, Λ _ ∞ Sgn (f_ ∞) & ae in Ω,\Δ f_ ∞\,=\, μ _ ∞ & in D'(Ω), array\right. aligned Δ u∞∈ Λ∞ Sgn (f∞) ae in Ω, Δ f∞= μ∞ in D′(Ω), for some f_ ∞ ∈ L^ 1 (Ω) ∩ BV_ loc (Ω) f∞∈ L 1 (Ω)∩ BV loc (Ω) and a measure μ _ ∞ ∈ M (Ω) μ∞∈ M (Ω), for either choice of boundary conditions. Here Sgn is the multi-valued sign function. We also study the dependence of the eigenvalue Λ _ ∞ Λ∞ on the domain, establishing the validity of a Faber–Krahn type inequality: among all C^ 1, 1 C 1, 1 domains with fixed measure, the ball is a strict minimiser of Ω ↦ Λ _ ∞ (Ω) Ω↦ Λ∞(Ω). This result is shown to hold true for either choice of boundary conditions and in every dimension.