Weyl asymptotics for fractional-order Dirichlet realizations in nonsmooth cases
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Let P be a symmetric 2a-order classical strongly elliptic pseudodifferential operator with even symbol p(x, ξ) on Rn (0 < a < 1), for example a perturbation of (−Δ)a. Let Ω ⊂ Rn be bounded, and let PD be the Dirichlet realization in L2(Ω) defined under the exterior condition u = 0 in Rn \ Ω. When p(x, ξ) and Ω are C∞, it is known that the eigenvalues λj (ordered in a nondecreasing sequence for j → ∞) satisfy a Weyl asymptotic formula λj (PD) = C(P, Ω)j2a/n + o(j2a/n) for j → ∞, with C(P, Ω) determined from the principal symbol of P. We now show that this result is valid for more general operators with a possibly nonsmooth x-dependence, over Lipschitz domains, and that it extends to P∼ = P + P′ + P′′, where P′ is an operator of order < min{2a, a + 21 } with certain mapping properties, and P′′ is bounded in L2(Ω) (e.g. P′′ = V (x) ∈ L∞(Ω)). Also the regularity of eigenfunctions of PD is discussed.
Original language | English |
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Journal | Mathematica Scandinavica |
Volume | 129 |
Issue number | 3 |
Pages (from-to) | 593-612 |
ISSN | 0025-5521 |
DOIs | |
Publication status | Published - 2023 |
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