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Collective excitations in fluids of soft interacting particles

Khrapak, Sergey (2018) Collective excitations in fluids of soft interacting particles. 16th International Conference on the Physics of Non-Ideal Plasma, 24-28 September 2018, Saint-Malo, France. (Unpublished)

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The purpose of this presentation is to introduce very simple practical analytical expressions, which describe dispersion relations of collective modes in fluids composed of soft interacting particles, including strongly coupled plasmas. The expressions are derived within the framework of the quasi-crystalline approximation (QCA) also known as the quasi-localized charge approximation (QLCA),combined with a simple excluded-volume-based approximation for the radial distribution function. Fully analytical expressions without free parameters have been derived for strongly coupled Yukawa and Coulomb (one-component plasma) systems in three dimensions, as well as one-component plasma fluids with Coulomb and logarithmic interactions in two-dimensions. The accuracy of these expressions will be demonstrated using the comparison with the results from numerical simulations (available numerical results have been complemented by new simulations). The approach appears to be particularly useful for soft long-ranged interactions operating in plasma-related systems, but is not limited to the plasma-related context. As an example, its application to dipole-like interactions in two-dimensions will be demonstrated. Possible applications of the obtained results will be briefly discussed.

Item URL in elib:https://elib.dlr.de/122004/
Document Type:Conference or Workshop Item (Speech)
Title:Collective excitations in fluids of soft interacting particles
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:collective modes in fluids, waves in plasmas, dispersion relations in soft matter, dynamics of one-component plasma, dynamics of Yukawa systems, complex (dusty) plasmas
Event Title:16th International Conference on the Physics of Non-Ideal Plasma
Event Location:Saint-Malo, France
Event Type:international Conference
Event Dates:24-28 September 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Komplexe Plasmen / Theory, Simulation (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Khrapak, Sergey
Deposited On:05 Oct 2018 12:43
Last Modified:28 Mar 2019 09:06

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