Theoretical and numerical study on magnetic field generation by rela- tivistic baroclinic effect

2016 Fiscal Year Final Research Report

• Project/Area Number: 26800279
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Plasma science
• Research Institution: The University of Tokyo
• Principal Investigator: Kawazura Yohei 東京大学, 大学院新領域創成科学研究科, 助教 (80725375)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 電磁流体力学 / 最小作用の原理 / リラベリング対称性 / 相対論

Outline of Final Research Achievements

We found the relativistic helicity, which is conserved in four-dimensional space time, is originated from the relabeling symmetry of a fluid element. Next we formulated the action principle for the extended relativistic magnetohydrodynamics (MHD). This action principle encompasses other magnetohydrodynamic models. The relativistic Hall MHD model, which is derived by this action principle, includes electron's thermal inertia; and thus it is possible to induce collision less magnetic reconnection with ion skin depth scale. Furthermore, in relativistic Hall MHD, since the fast magnetosonic wave reaches to the light limit, the fast wave group surface coalesce with that of the shear Alfven wave. We conducted a numerical simulation for ultra-high intensity laser experiment, and elucidated the plasma regime where the relativistic baroclinic effect is finite.

Free Research Field

プラズマ物理