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We present the full classification of wave patterns evolving from an initial step-like discontinuity for arbitrary choice of boundary conditions at the discontinuity location in the DNLS equation theory. In this non-convex dispersive hydrodynamics problem, solutions of the Whitham modulation equations are mapped to parameters of a modulated wave by two-valued functions what makes situation much richer than that for a convex case of the NLS equation type. In particular, new types of simple-wave-like structures appear as building elements of the whole wave pattern. The developed here theory can find applications to propagation of light pulses in fibers and to the theory of Alfv\'en dispersive shock waves.

Evolution of initial discontinuities in the DNLS equation theory