Abstract
We consider the nonlinear string equation with Dirichlet boundary conditions u tt −u xx =ϕ(u), with ϕ(u)=Φu3+O(u5) odd and analytic, Φ≠0, and we construct small amplitude periodic solutions with frequency ω for a large Lebesgue measure set of ω close to 1. This extends previous results where only a zero-measure set of frequencies could be treated (the ones for which no small divisors appear). The proof is based on combining the Lyapunov-Schmidt decomposition, which leads to two separate sets of equations dealing with the resonant and non-resonant Fourier components, respectively the Q and the P equations, with resummation techniques of divergent powers series, allowing us to control the small divisors problem. The main difficulty with respect to the nonlinear wave equations u tt −u xx +Mu=ϕ(u), M≠0, is that not only the P equation but also the Q equation is infinite-dimensional.
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Gentile, G., Mastropietro, V. & Procesi, M. Periodic Solutions for Completely Resonant Nonlinear Wave Equations with Dirichlet Boundary Conditions. Commun. Math. Phys. 256, 437–490 (2005). https://doi.org/10.1007/s00220-004-1255-8
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DOI: https://doi.org/10.1007/s00220-004-1255-8