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A dispersive Landau-fluid model is used to study the decay and modulational instabilities of circularly- polarized Alfven waves in a collisionless plasma, as well as their nonlinear developments. Comparisons are presented with the drift-kinetic approximation for the dispersionless regime and with hybrid simulations in more general condi- tions. The effect of the nature of the instability on particle heating is discussed, together with the formation of coherent structures or the development of an inverse cascade.

Landau-fluid simulations of Alfvén-wave instabilities in a warm collisionless plasma