On time periodic solutions to the conformal cubic wave equation on the Einstein cylinder

Abstract

We consider the conformal wave equation on the Einstein cylinder with a defocusing cubic non-linearity. Motivated by a method developed by Rostworowski-Maliborski on the existence of time periodic solutions to the spherically symmetric Einstein-Klein-Gordon system, we study perturbations around the zero solution as a formal series expansion and assume that the perturbations bifurcate from $1-$mode. In the center of this work stands a rigorous proof on how one can choose the initial data to cancel out all secular terms in the resonant system. Interestingly, our analysis reveals that the only possible choice for the existence of time periodic solutions is when the error terms in the expansion are all proportional to the dominant $1-$mode. Finally, we use techniques from ordinary differential equations and establish the existence of time periodic solutions for initial data proportional to the first mode of the linearized operator.

arXiv comment43 pages, 1 figure, We improved the presentation of the paper by splitting section 1.3 into two sections (now 1.2 and 1.3) and Theorem 1.1 into two Theorems (now 1.1 and 1.2), added more references and an acknowledgement section. All results are unchanged

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• Non-linear periodic waves on the Einstein cylinder