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Viscoelastic description of Langmuir mode and its negative dispersion in one-component plasmas
Докладчик(и): Храпак Сергей Алексеевич (ОИВТ РАН) Дата, время проведения: 24 сентября 2026 года (четверг) в 11:00 Адрес: Семинар будет проходить в режиме удаленного доступа на базе сервера ZOOM Аннотация. A viscoelastic approach that describes the long-wavelength dispersion of the Langmuir mode in the classical one-component plasma (OCP) is presented. The main objective of this simple approach is to correctly capture the onset of negative dispersion at the crossover between ideal plasma (gas-like regime) and strongly coupled plasma (liquid-like regime) dynamics. In this regime, known as Frenkel crossover, the bulk and shear relaxation times are comparable with the oscillation period, and neither purely viscous nor elastic responses are appropriate. The proposed viscoelastic approach predicts the onset of negative dispersion with remarkable precision. Its accuracy in weak- and strong coupling regimes, advantage over previous approaches, and potential relevance to other fluids are briefly discussed. Семинар будет проходить в режиме удаленного доступа на базе сервера ZOOM Ссылка на подключение к Zoom конференции: https://us06web.zoom.us/j/3853805150?pwd=VERsRXkzcW5IVEgyU2ZpVWlra0hwdz09&omn=88092974365 Идентификатор конференции: 385 380 5150 Код доступа: BibermanLM |