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Weighted integrability of polyharmonic functions
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Mathematics (Div.).ORCID iD: 0000-0002-4971-7147
2014 (English)In: Advances in Mathematics, ISSN 0001-8708, E-ISSN 1090-2082, Vol. 264, 464-505 p.Article in journal (Refereed) Published
Abstract [en]

To address the uniqueness issues associated with the Dirichlet problem for the N-harmonic equation on the unit disk D in the plane, we investigate the L-P integrability of N-harmonic functions with respect to the standard weights (1 vertical bar z vertical bar(2))(alpha). The question at hand is the following. If u solves Delta(N)u = 0 in D, where Delta stands for the Laplacian, and integral(D)vertical bar u(Z)vertical bar(p)(1 - vertical bar z vertical bar(2))(alpha)dA(z) < +infinity, must then u(z) 0? Here, N is a positive integer, alpha is real, and 0 < p < +infinity; dA is the usual area element. The answer will, generally speaking, depend on the triple (N, p, alpha). The most interesting case is 0 < p < 1. For a given N, we find an explicit critical curve p bar right arrow beta(N, p) - a piecewise affine function - such that for alpha > beta(N, p) there exist nontrivial functions u with Delta Nu = 0 of the given integrability, while for alpha <= beta(N, p), only u(z) 0 is possible. We also investigate the obstruction to uniqueness for the Dirichlet problem, that is, we study the structure of the functions in PHN, alpha p (D) when this space is nontrivial. We find a new structural decomposition of the polyharmonic functions - the cellular decomposition - which decomposes the polyharmonic weighted LP space in a canonical fashion. Corresponding to the cellular expansion is a tiling of part of the (p, alpha) plane into cells. The above uniqueness for the Dirichlet problem may be considered for any elliptic operator of order 2N. However, the above-mentioned critical integrability curve will depend rather strongly on the given elliptic operator, even in the constant coefficient case, for N > 1.

Place, publisher, year, edition, pages
2014. Vol. 264, 464-505 p.
Keyword [en]
Polyharmonic functions, Weighted integrability, Boundary behavior, Cellular decomposition
National Category
Mathematics
Identifiers
URN: urn:nbn:se:kth:diva-153838DOI: 10.1016/j.aim.2014.07.020ISI: 000341615100013Scopus ID: 2-s2.0-84908474639OAI: oai:DiVA.org:kth-153838DiVA: diva2:755168
Funder
Swedish Research Council
Note

QC 20141014

Available from: 2014-10-14 Created: 2014-10-09 Last updated: 2017-12-05Bibliographically approved

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Hedenmalm, Håkan

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