no. 4
On microlocal analyticity of solutions of first-order nonlinear PDE
Berhanu, Shif1
1 Temple University Department of Mathematics Philadelphia, PA 19122 (USA)
Annales de l'Institut Fourier, Volume 59 (2009) no. 4, pp. 1267-1290.

We study the microlocal analyticity of solutions u of the nonlinear equation

ut=f(x,t,u,ux)

where f(x,t,ζ 0 ,ζ) is complex-valued, real analytic in all its arguments and holomorphic in (ζ 0 ,ζ). We show that if the function u is a C 2 solution, σ∈CharL u and 1 iσ([L u ,L u ¯])<0 or if u is a C 3 solution, σ∈CharL u , σ([L u ,L u ¯])=0, and σ([L u ,[L u ,L u ¯]])≠0, then σ∉WF a u. Here WF a u denotes the analytic wave-front set of u and CharL u is the characteristic set of the linearized operator. When m=1, we prove a more general result involving the repeated brackets of L u and L u ¯ of any order.

Nous étudions l’analyticité microlocale des solutions de l’équation non linéaire

ut=f(x,t,u,ux)

où f(x,t,ζ 0 ,ζ) est une fonction analytique réelle, à valeurs complexes, et holomorphe en (ζ 0 ,ζ). Nous montrons que si u est une solution de classe C 2 , σ∈ Char L u et 1 iσ([L u ,L u ¯])<0, ou si u est une solution de classe C 3 , σ∈ Char L u , σ([L u ,L u ¯])=0 et σ([L u ,[L u ,L u ¯]])≠0, alors σ∉WF a (u). Ici, WF a (u) désigne le front d’onde analytique de u et Char L u l’ensemble caractéristique de l’opérateur linéarisé. Quand m=1, nous démontrons un résultat plus général faisant intervenir les crochets des opérateurs L u et L u ¯ de tout ordre.

DOI: 10.5802/aif.2463
Classification: 35A18, 35B65, 35F20
Keywords: Analytic wave-front set, linearized operator
Berhanu, Shif 1

1 Temple University Department of Mathematics Philadelphia, PA 19122 (USA) 
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Berhanu, Shif. On microlocal analyticity of solutions of first-order nonlinear PDE. Annales de l'Institut Fourier, Volume 59 (2009) no. 4, pp. 1267-1290. doi : 10.5802/aif.2463. https://aif.centre-mersenne.org/articles/10.5802/aif.2463/

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