Noether symmetries of time-dependent damped nonlinear multidimensional wave equations produce conservation of linear and angular momentum, with the algebra enlarging to a conformal subalgebra for particular damping and nonlinearity forms.
Lie Symmetry Structure of Nonlinear Wave Equations in $$(n+1)$$-Dimensional Space-time
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Noether symmetries and conservation laws of a class of time-dependent multidimensional nonlinear wave equations
Noether symmetries of time-dependent damped nonlinear multidimensional wave equations produce conservation of linear and angular momentum, with the algebra enlarging to a conformal subalgebra for particular damping and nonlinearity forms.