Speaker
Sergey A. Khrapak
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.3001.pdf
Simple description of collective modes in strongly coupled plasma fluids
Sergey Khrapak
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR),
82234 Weßling, Germany; Aix-Marseille University, CNRS, PIIM, 13397 Marseille, France;
Joint Institute for High Temperatures, Russian Academy of Sciences, 125412 Moscow, Russia
Collective dynamics in strongly coupled plasmas is an important research topic with interdis-
ciplinary relations (e.g. to collective motion in other condensed matter systems). The purpose
of this presentation is to introduce a simple analytical approach to the description of collective
modes in strongly coupled plasma-related fluids. The approach is based on the quasi-crystalline
or quasi-localized charge approximation, which relates wave dispersion relations to the pair-
wise interaction potential and the equilibrium radial distribution function (RDF), characterizing
the fluid structural properties. It turns out that for soft long-ranged interactions occurring in the
plasma-related context a simplest model RDF, which takes into account the excluded volume
(correlational hole) effect, can be very useful. It allows to obtain simple and elegant analytical
expressions for the dispersion relations, which demonstrate good accuracy at long wavelengths.
Several examples will be presented, including one-component plasmas in two and three di-
mensions and weakly screened Yukawa systems (dusty plasmas) in three dimensions. Detailed
comparison with the results from numerical simulations will be given. Applications to other
systems with soft pairwise interactions will be briefly discussed.
This work was supported by the A*MIDEX project (Nr. ANR-11-IDEX-0001-02) funded by
the French Government “Investissements d’Avenir” program managed by the French National
Research Agency (ANR).
