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EP: Fachverband Extraterrestrische Physik

EP 4: Numerische Modellierung

EP 4.9: Vortrag

Dienstag, 13. März 2012, 19:00–19:15, V55.02

Adaptive phase space simulation of relativistic QED plasma — •Nina Elkina — LMU, Munich

Kinetic modeling of relativistic plasma with proper accounting for quantum effects is a challenging task which arises in astrophysics. Collective effects in such plasma are governing high energy processes around highly magnetized compact rotating stars, merging black holes, jets from active galactic nuclei. As laser intensities increase, quantum electrodynamic effects in plasma pair production will become increasingly important and ultimately dominant in laboratory conditions.

A central problem simulating of relativistic plasma with essential QED effects is the need for a proper model for radiation, which would simultaneously account for both classical radiation responsible for collective emission and noncoherent hard photons. In order to solve on the computer the kinetic equations for QED plasma we adopt the particles-in-cell method coupled with Monte-Carlo procedure for quantum effects. This method requires huge computational power and memory due to high dimensionality of the problem and sometimes simply not feasible within a brute force approach. In order to circumvent this barrier we use an adaptive phase space refinement technique to keep a number of numerical quasi-particles per cell approximately constant while a number of real particles can increase or decrease rapidly due to QED effects. Adaptive refinement in phase space brings a new capability to represent the subtle dynamics in the phase space which a critical issue for study of gamma and X radiation sources sources in laboratory as well as in astrophysical conditions.