Erlangen 2026 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 15: High Energy Density Physics II

P 15.4: Vortrag

Donnerstag, 19. März 2026, 12:00–12:15, KH 01.020

Collective modes of dense hydrogen plasmas from semi-classical molecular dynamics simulations — •Hanno Kählert and Daniels Krimans — Christian-Albrechts-Universität zu Kiel, ITAP, Germany

Dense hydrogen occurs in the interior of giant planets and during laser-driven fusion. Its properties, such as the equation of state or transport coefficients, are of high interest for modeling applications. The dynamic structure factor (DSF) is related to many thermodynamic and transport coefficients. Here, the DSF is computed from semi-classical molecular dynamics (MD) simulations [1] using the improved Kelbg potential [2]. It is shown that the structural properties are in good agreement with first-principle quantum Monte Carlo simulations. The DSF is compared with wave-packet MD simulations [3]. While the electron-electron DSF from the two methods agrees qualitatively, excellent agreement is found for the ion sound speed extracted from the ion-ion DSF. The latter can be reproduced accurately with a Yukawa one-component plasma (YOCP) model. A method to determine the screening and coupling parameters of a YOCP solely from structural properties is discussed [4].
[1] H. Kählert, submitted (2025).
[2] A. V. Filinov, V. O. Golubnychiy, M. Bonitz, W. Ebeling, and J. W. Dufty, Phys. Rev. E 70, 046411 (2004).
[3] P. Svensson, Y. Aziz, T. Dornheim, S. Azadi, P. Hollebon, A. Skelt, S. M. Vinko, and G. Gregori, Phys. Rev. E 110, 055205 (2024).
[4] D. Krimans and H. Kählert, submitted (2025).

Keywords: hydrogen; strong coupling; dense plasma; waves