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Jeans instability; inhomogeneous plasma; polarization field

The dynamics of a self-gravitating unmagnetized, inhomogeneous, streaming dusty plasma is studied in the present work. The presence of the shear flow causes the coupling between gravitational and electrostatic forces. In the absence of self-gravity, the fluctuations in the plasma may grow at the expense of the density inhomogeneity and for certain wavelengths, such an unstable mode may dominate the usual streaming instability. However, in the presence of self-gravity, the plasma inhomogeneity causes an overlap between Jeans and streaming modes and collapse of the grain will continue at all wavelengths.

B P Pandey¹ B Van Der Holst^{1 2} J Vranješ^{1 2} S Poedts^{1 2}

1. Computational Plasma Dynamics Laboratory, Kettering University, Flint, MI - 48504, USA
2. Center for Plasma Astrophysics, K.U. Leuven, Celestijnenlaan 200B, Leuven - 3001, Belgium

Published

July 2003

Manuscript received

26 October 2002

Manuscript revised

21 February 2003