Journal of Physics A: Mathematical, Nuclear and General

Whitham's theory of nonlinear water waves is applied to a classical field with the lagrangian density L=1/2((( delta mu phi )( delta mu phi )-m2 phi 2)/(1+ lambda phi 2)). This is the isoscalar analogue of a chiral invariant SU(2)(X)SU(2) lagrangian with symmetry breaking term included. The corresponding field equation admits simple harmonic plane-wave solutions. The author found that the important field quantities of these waves, namely the wavenumber k and amplitude A obey a system of first… Expand