Bonn 2000 – wissenschaftliches Programm
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P: Plasmaphysik
P 6: Theorie/Dichte Plasmen III
P 6.6: Vortrag
Dienstag, 4. April 2000, 18:00–18:15, HS III
Pair Distribution Function of Dense Quantum Plasmas — •V.S. Filinov1, M. Bonitz1, D. Kremp1, and V.E. Fortov2 — 1Universität Rostock, Fachbereich Physik, 18051 Rostock — 2High Energy Density Research Center, Moscow
Using a novel path integral representation of the many-particle density operator, we calculate the pair distribution function of dense Fermi systems fully including quantum and spin effects. Until now, path integral simulations for fermions encountered essential difficulties due to the so-called sign problem, i.e. the appearance of differences of large numbers, resulting from the Fermi statistics. As a consequence, previous simulations had to use a number of additional assumptions on the density operator, such as fixed nodes or the restricted path approximation. In contrast, our apprach allows to compute macroscopic properties without additional approximations on the density operator [1,2]. We present numerical results for the pair distribution functions for a mixture of quantum electrons and classical protons, which is of high current interest in many fields of plasma physics.
[1] V.S. Filinov, P.R. Levashov, V.E. Fortov, and M. Bonitz, in “Progress in Nonequilibrium Green’s functions”, M. Bonitz (Ed.), World Scientific Publ. New York/Singapore 2000
[2] V.S. Filinov, V.E. Fortov, M. Bonitz, and D. Kremp submitted to Europhys. Lett.