Action principles for relativistic extended magnetohydrodynamics: A unified theory of magnetofluid models
- Univ. of Tokyo, Kashiwa, Chiba (Japan). Graduate School of Frontier Sciences; Univ. of Oxford, Oxford (United Kingdom). Rudolf Peierles Centre for Theoretical Phyiscs
- Univ. of Texas, Austin, TX (United States). Dept. of Physics and Inst. for Fusion Studies
Two types of Eulerian action principles for relativistic extended magnetohydrodynamics (MHD) are formulated. With the first, the action is extremized under the constraints of density, entropy, and Lagrangian label conservation, which leads to a Clebsch representation for a generalized momentum and a generalized vector potential. The second action arises upon transformation to physical field variables, giving rise to a covariant bracket action principle, i.e., a variational principle in which constrained variations are generated by a degenerate Poisson bracket. Upon taking appropriate limits, the action principles lead to relativistic Hall MHD and well-known relativistic ideal MHD. For the first time, the Hamiltonian formulation of relativistic Hall MHD with electron thermal inertia (akin to Comisso et al., Phys. Rev. Lett. 113, 045001 (2014) for the electron–positron plasma) is introduced. This thermal inertia effect allows for violation of the frozen-in magnetic flux condition in marked contrast to nonrelativistic Hall MHD that does satisfy the frozen-in condition. We also find the violation of the frozen-in condition is accompanied by freezing-in of an alternative flux determined by a generalized vector potential. Finally, we derive a more general 3 + 1 Poisson bracket for nonrelativistic extended MHD, one that does not assume smallness of the electron ion mass ratio.
- Research Organization:
- Univ. of Texas, Austin, TX (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- FG02-04ER54742; FG02-04ER-54742
- OSTI ID:
- 1535295
- Alternate ID(s):
- OSTI ID: 1349332
- Journal Information:
- Physics of Plasmas, Vol. 24, Issue 2; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Lorentz invariant ‘potential magnetic field’ and magnetic flux conservation in an ideal relativistic plasma
|
journal | August 2018 |
Structure and structure-preserving algorithms for plasma physics
|
journal | April 2017 |
Direction of cascades in a magnetofluid model with electron skin depth and ion sound Larmor radius scales
|
journal | July 2018 |
Relativistic Tearing Mode in Pair Plasmas and Application to Magnetic Giant Flares
|
journal | July 2019 |
Similar Records
Helically symmetric extended magnetohydrodynamics: Hamiltonian formulation and equilibrium variational principles
The kinetic origin of the fluid helicity—A symmetry in the kinetic phase space