The Dirichlet principle for inner variations
The Dirichlet principle for inner variations
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内变分的狄利克雷原理
DOI:
10.1007/s00208-020-02133-y
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发表时间:
2021
影响因子:
1.4
通讯作者:
Onninen, Jani
中科院分区:
文献类型:
--
作者:
Iwaniec, Tadeusz;Onninen, Jani
We are concerned with the Dirichlet energy of mappings defined on domains in the complex plane. The Dirichlet Principle, the name coined by Riemann, tells us that theouter variationof a harmonic mapping increases its energy. Surprisingly, when one jumps into details aboutinner variations, which are just a change of independent variables, new equations and related questions start to matter. The inner variational equation, called theHopf–Laplace equation, is no longer the Laplace equation. Its solutions are generally not harmonic; we refer to them asHopf harmonics. The natural question that arises is how does a change of variables in the domain of a Hopf harmonic map affect its energy? We show, among other results, that in case of a simply connected domain the energy increases. This should be viewed as Riemann’s Dirichlet Principle for Hopf harmonics. The Dirichlet Principle for Hopf harmonics in domains of higher connectivity is not completely solved. What complicates the matter is the insufficient knowledge of global structure of trajectories of the associated Hopf quadratic differentials, mainly because of the presence of recurrent trajectories. Nevertheless, we have established the Dirichlet Principle whenever the Hopf differential admits closed trajectories and crosscuts. Regardless of these assumptions, we established the so-calledInfinitesimal Dirichlet Principlefor all domains and all Hopf harmonics. Precisely, the second order term of inner variation of a Hopf harmonic map is always nonnegative.
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DOI:
10.1090/s0002-9939-1963-0157364-3
发表时间:
1963
期刊:
arXiv: Analysis of PDEs
影响因子:
--
作者:
H. Levine
通讯作者:
H. Levine
影响因子:
0.6
作者:
A. Marden;I. Richards;B. Rodin
通讯作者:
B. Rodin
影响因子:
1.4
作者:
T. Iwaniec;Jani Onninen
通讯作者:
Jani Onninen
DOI:
10.1051/cocv/2015003
发表时间:
2016
期刊:
ESAIM: Control, Optimisation and Calculus of Variations
影响因子:
--
作者:
B. Benesová;M. Kružík
通讯作者:
M. Kružík
DOI:
10.1007/bf02825640
发表时间:
1952
期刊:
Journal d’Analyse Mathématique
影响因子:
--
作者:
P. Garabedian;M. Schiffer
通讯作者:
M. Schiffer