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|Type:||Artigo de evento|
|Title:||Soliton And Double Layer Solutions For Four Component Dusty Plasmas|
|Abstract:||In dusty plasmas with warm electrons, warm positive ions, and negative and positively charged cold dust grains which are simultaneously present, it is shown that stationary solutions of the fluid equations combined with Poisson's equation can be expressed in terms of the energy integral of a classical particle with a modified Sagdeev potential. We found that in four component dusty plasma there are changes in the nonlinear properties of the DAW. Compressive dust-acoustic solitons exist only when there is at least a trace of positively charged dust grains. The four fluid dusty plasma system, with both the negatively and positively charged dust grains, provides the ambient to excite double layers. These are analyzed both analytically and numerically. The parametric regions of solitons, cavitons and double layers are given, and their profiles are displayed graphically. At the end, we have analysed the case in which the dust charge is introduced self-consistently, using a simple charging model. The result of this analysis is that for small k-values large damping occurs, but as k-values become large the damping factor goes to zero, so, the soliton and double layers analysis maintain valid. © 2005 American Institute of Physics.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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