The Sobolev Jordan-Schönflies problem
The Sobolev Jordan-Schönflies problem
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索博列夫乔丹-斯科恩弗利斯问题
DOI:
10.1016/j.aim.2022.108795
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发表时间:
2023
影响因子:
1.7
通讯作者:
Onninen, Jani
中科院分区:
文献类型:
--
作者:
Koski, Aleksis;Onninen, Jani
We consider the planar unit disk D as the reference configuration and a Jordan domain Y as the deformed configuration, and study the problem of extending a given boundary homeomorphism φ:∂ D→ onto∂ Y as a Sobolev homeomorphism of the complex plane. Investigating such a Sobolev variant of the classical Jordan-Schönflies theorem is motivated by the well-posedness of the related pure displacement variational questions in the theory of Nonlinear Elasticity (NE) and Geometric Function Theory (GFT). Clearly, the necessary condition for the boundary mapping φ to admit a W 1, p-Sobolev homeomorphic extension is that it first admits a continuous W 1, p-Sobolev extension. For an arbitrary target domain Y this, however, is not sufficient. Indeed, first for each p<∞ we construct a Jordan domain Y and a homeomorphism φ:∂ D→ onto∂ Y which admits a continuous W 1, p-extension but does not even admit a W 1, 1-homeomorphic extension. Second, for a quasidisk target Y and the whole range of p, we prove that a boundary homeomorphism φ:∂ D→ onto∂ Y admits a W loc 1, p-homeomorphic extension to C if and only if it admits a W 1, p-extension to the unit disk. Quasidisks have been a subject of intensive study in GFT. They do not allow for singularities on the boundary such as cusps. Third, for any power-type cusp target there is a boundary homeomorphism from the unit circle whose harmonic extension has finite Dirichlet energy but does not have a homeomorphic extension in W 1, 2 (D, C). Surprisingly, the Dirichlet integral (p= 2) plays a unique role for the Sobolev Jordan-Schönflies Problem in the case of cusp targets. Even more, fourth we prove that if the target Y has piecewise smooth boundary, p≠ 2 and φ:∂ D→ onto∂ Y has a W 1, p-Sobolev extension to D, then it admits a homeomorphic extension to C in W loc 1, p (C, C). Fifth, if in addition Y is quasiconvex, then the one-sided Sobolev Jordan-Schönflies problem has a solution when p= 2. Indeed, we show that the harmonic extension of φ:∂ D→ onto∂ Y has a finite Dirichlet integral if and only if φ admits a homeomorphic extension h: D‾→ onto Y‾ with finite Dirichlet energy.
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DOI:
10.1090/s0002-9939-06-08506-6
发表时间:
2006
期刊:
Annales Academiae Scientiarum Fennicae Mathematica
影响因子:
--
作者:
G. Verchota
通讯作者:
G. Verchota
DOI:
--
发表时间:
1934
期刊:
影响因子:
--
作者:
M. D. Kirszbraun
通讯作者:
M. D. Kirszbraun
影响因子:
0.6
作者:
C. B. Morrey
通讯作者:
C. B. Morrey
影响因子:
0.9
作者:
Kovalev, Leonid V.
通讯作者:
Kovalev, Leonid V.
DOI:
10.1007/s00526-014-0719-8
发表时间:
2015
影响因子:
2.1
作者:
T. Iwaniec;Jani Onninen
通讯作者:
Jani Onninen