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KAM for the nonlinear beam equation
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In this paper we prove a KAM theorem for small-amplitude solutions of the non linear beam equation on the d-dimensional torus$$u_{tt}+\Delta^2 u+m u + \partial_u G(x,u)=0, \quad t \in {\mathbb{R}}, x \in {\mathbb{T}^d}, \quad (*)$$where \({G(x,u)=u^4+ O(u^5)}\). Namely, we show that, for generic m, many of the small amplitude invariant finite dimensional tori of the linear equation \({(*)_{G=0}}\), written as the system$$u_t=-v,\quad v_t=\Delta^2 u+mu,$$persist as invariant tori of the nonlinear equation \({(*)}\), re-written similarly. The persisted tori are filled in with time-quasiperiodic solutions of \({(*)}\). If \({d\ge2}\), then not all the persisted tori are linearly stable, and we construct explicit examples of partially hyperbolic invariant tori. The unstable invariant tori, situated in the vicinity of the origin, create around them some local instabilities, in agreement with the popular belief in the nonlinear physics that small-amplitude solutions of space-multidimensional Hamiltonian PDEs behave in a chaotic way.Keywords and phrasesBeam equationKAM theoryHamiltonian systemsReferencesArn06.V.I. Arnold. Mathematical Methods in Classical Mechanics, 3rd edn. Springer, Berlin (2006).Bam03.Bambusi D.: Birkhoff normal form for some nonlinear PDEs. Communications in Mathematical Physics 234, 253–283 (2003)MathSciNetCrossRefMATHGoogle ScholarBG06.Bambusi D., Grébert B.: Birkhoff normal form for PDE’s with tame modulus. Duke Mathematical Journal 135(3), 507–567 (2006)MathSciNetCrossRefMATHGoogle ScholarBB12.Berti M., Bolle P.: Sobolev quasi periodic solutions of multidimensional wave equations with a multiplicative potential. 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