Electron trapping in a finite amplitude Langmuir wave (LW) leads to a frequency shift, ∆ωTP < 0 , and reduced Landau damping. These may lead to modulational instability. Its growth rate and damping threshold, due to escape of trapped electrons at rate ν, are calculated for the first time in the short wavelength regime. If the background plasma is in thermal equilibrium, it is shown that this tr...

Modulational instability of ion-acoustic (IA) waves is investigated in an unmagnetized quantum plasma by adopting equation state for Fermi electron gas. To this end, a basic set one-dimensional hydrodynamic equations reduced to nonlinear Schrödinger using the reductive perturbation method. Quantum corrections are described nondimensional parameter H proportional diffraction parameter. Based on ...

We investigate the dynamics of two miscible superfluids experiencing fast counterflow in a narrow channel. The superfluids are formed by two distinguishable components of a trapped dilute-gas Bose-Einstein condensate (BEC). The onset of counterflow-induced modulational instability throughout the cloud is observed and shown to lead to the proliferation of dark-dark vector solitons. These soliton...

A specific, genuinely three-dimensional mechanism of rogue wave formation, in a late stage of the modulational instability of a perturbed Stokes deep-water wave, is recognized through numerical experiments. The simulations are based on fully nonlinear equations describing weakly three-dimensional potential flows of an ideal fluid with a free surface in terms of conformal variables. Spontaneous ...