P. Basarabhorwath et al., AMPLITUDE-PHASE REPRESENTATION FOR SOLUTIONS OF NONLINEAR DALEMBERT EQUATIONS, Journal of physics. A, mathematical and general, 28(21), 1995, pp. 6193-6201
We consider the nonlinear complex d'Alembert equation square Psi = F(\
Psi\)Psi with Psi, represented in terms of amplitude and phase, in (1
+ n)-dimensional Minkowski space. We exploit a compatible d'Alembert-H
amilton system to construct new types of exact solutions for some nonl
inearities.