16-31 Gianni Arioli, Hans Koch
Families of periodic solutions for some Hamiltonian PDEs (1077K, pdf) Apr 11, 16
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Abstract. We consider the nonlinear wave equation $u_{tt}-u_{xx}=\pm u^3$ and the beam equation $u_{tt}+u_{xxxx}=\pm u^3$ on an interval. Numerical observations indicate that time-periodic solutions for these equations are organized into structures that resemble branches and seem to undergo bifurcations. Besides describing our observations, we prove the existence of time-periodic solutions for various periods (a set of positive measure in the case of the beam equation) along the main nontrivial "branch".

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