On nonlinear partial differential equations with an infinite-dimensional conditional symmetry

Details On nonlinear partial differential equations with an infinite-dimensional conditional symmetry On nonlinear partial differential equations with an infinite-dimensional conditional symmetry

2004-02-22

arxiv.org/abs/math-ph/0402059v2

J. Math. Anal. Appl. 298, 487-500 (2004)

Physics

Mathematical Physics

Latex2e, 14 pages, no figures; final form

Scientific paper

10.1016/j.jmaa.2004.05.038

The invariance of nonlinear partial differential equations under a certain infinite-dimensional Lie algebra A_N(z) in N spatial dimensions is studied. The special case A_1(2) was introduced in J. Stat. Phys. {\bf 75}, 1023 (1994) and contains the Schr\"odinger Lie algebra sch_1 as a Lie subalgebra. It is shown that there is no second-order equation which is invariant under the massless realizations of A_N(z). However, a large class of strongly non-linear partial differential equations is found which are conditionally invariant with respect to the massless realization of A_N(z) such that the well-known Monge-Ampere equation is the required additional condition. New exact solutions are found for some representatives of this class.

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