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Equilibrium points of a singular cooperative system with free boundary

In this paper we initiate the study of maps minimising the energy∫D(|∇u|2+2|u|)dx, which, due to Lipschitz character of the integrand, gives rise to the singular Euler equationsΔu=u|u|χ{|u|>0},u=(u1,⋯,um). Our primary goal in this paper is to set up a road map for future developments of the theor...

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Bibliographic Details
Published in:Advances in mathematics (New York. 1965) 2015-08, Vol.280, p.743-771
Main Authors: Andersson, John, Shahgholian, Henrik, Uraltseva, Nina N., Weiss, Georg S.
Format: Article
Language:English
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Summary:In this paper we initiate the study of maps minimising the energy∫D(|∇u|2+2|u|)dx, which, due to Lipschitz character of the integrand, gives rise to the singular Euler equationsΔu=u|u|χ{|u|>0},u=(u1,⋯,um). Our primary goal in this paper is to set up a road map for future developments of the theory related to such energy minimising maps. Our results here concern regularity of the solution as well as that of the free boundary. They are achieved by using monotonicity formulas and epiperimetric inequalities, in combination with geometric analysis.
ISSN:0001-8708
1090-2082
1090-2082
DOI:10.1016/j.aim.2015.04.014