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Title: Action principles for relativistic extended magnetohydrodynamics: A unified theory of magnetofluid models

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4975013· OSTI ID:1535295
 [1]; ORCiD logo [2]; ORCiD logo [2]
  1. Univ. of Tokyo, Kashiwa, Chiba (Japan). Graduate School of Frontier Sciences; Univ. of Oxford, Oxford (United Kingdom). Rudolf Peierles Centre for Theoretical Phyiscs
  2. 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
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (4)

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

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