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|Type:||Artigo de periódico|
|Title:||Localized non-linear solutions in multiply-charged dusty plasmas|
|Abstract:||Finite amplitude localized electrostatic solitons in a multi-component unmagnetized dusty plasma are presented. Assuming that the constituents of dusty plasmas are warm electrons, warm positive ions, and an admixture of cold dust grains with negative and positive charges, 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. The latter is analyzed both analytically and numerically to demonstrate the coexistence of rarefactive and compressive electric potential pulses which travel faster than the effective dust-acoustic velocity. Compressive dust-acoustic solitons exist only when there is a significant fraction of positively charged dust grains. Furthermore, the four-fluid dusty plasma system, with both negative and positively charged dust grains, also provides the possibility of double layers. Conditions under which solitons and double layers arise are given, and their profiles are displayed graphically. The results of investigation should be helpful in identifying the salient features of nonlinear structures in low-temperature space and laboratory dusty plasmas in which positive and negatively charged dust grains coexist. In particular, we have applied the theory in the laboratory plasma and we can predict that a double layer might be possible to be launched if a trace ions component is added.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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