The solution manifold of the equation in Minkowski space is studied from the standpoint of the establishment of differential-geometric structures therein. It is shown that there is an almost Kähler structure globally defined on that is Poincaré invariant. In the vanishing curvature case the structure obtained coincides with the complex Hilbert structure in the solution manifold of the real wave equation. The proofs are based on the transfer of the equation to an ambient universal space-time.
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Irving E. Segal, Poincaré-Invariant Structures in the Solution Manifold of a Nonlinear Wave Equation. Rev. Mat. Iberoam. 2 (1986), no. 1, pp. 99–104DOI 10.4171/RMI/28