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.
Nonlinear equations invariant under Poincaré, similitude and conformal group in three-dimensional spacetime
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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.