Dust-acoustic waves in a self-gravitating nonextensive dusty plasma

Dust-acoustic waves (DAWs) are examined in an electrostatic self-gravitating dusty plasma whose electrons and ions are modeled by nonextensive q-distribution function while massive dust particles are Maxwellian distributed. A Vlasov-Poisson's set of equations is used for the derivation of plasma dispersion relation and growth rate of instability. The real wave frequency and instability growth rates are obtained for two situations; a) super-extensivity (q < 1) and b) sub-extensivity (q > 1). Significant modifications concerning the real wave frequencies and growth rates are presented with respect to self-gravitation parameter, nonextensive parameter, dust concentration and streaming speed. It is observed that parametric variation significantly modifies the threshold conditions and associated growth rates of instability of DAWs. The applicability of the present results in interstellar dust clouds is discussed.

Automated summary

In this study, Dust-acoustic waves (DAWs) are investigated in an electrostatic self-gravitating dusty plasma. The electrons and ions are modeled using a nonextensive q-distribution function, while the dust particles follow a Maxwellian distribution. The plasma dispersion relation and instability growth rate are derived using a Vlasov-Poisson set of equations. The effects of various parameters, such as self-gravitation, nonextensivity, dust concentration, and streaming speed, on the wave frequency and growth rate are examined. The applicability of the results in interstellar dust clouds is also discussed.