Imbalanced Relativistic Force-free Magnetohydrodynamic Turbulence

Type Journal Article
Names Jungyeon Cho, A. Lazarian
Publication The Astrophysical Journal
Volume 780
Pages 30
Journal Abbreviation The Astrophysical Journal
Date January 1, 2014
DOI 10.1088/0004-637X/780/1/30
ISSN 0004-637X
Library Catalog
Abstract When magnetic energy density is much larger than that of matter, as in pulsar/black hole magnetospheres, the medium becomes force-free and we need relativity to describe it. As in non-relativistic magnetohydrodynamics (MHD), Alfvénic MHD turbulence in the relativistic limit can be described by interactions of counter-traveling wave packets. In this paper, we numerically study strong imbalanced MHD turbulence in such environments. Here, imbalanced turbulence means the waves traveling in one direction (dominant waves) have higher amplitudes than the opposite-traveling waves (sub-dominant waves). We find that (1) spectrum of the dominant waves is steeper than that of sub-dominant waves, (2) the anisotropy of the dominant waves is weaker than that of sub-dominant waves, and (3) the dependence of the ratio of magnetic energy densities of dominant and sub-dominant waves on the ratio of energy injection rates is steeper than quadratic (i.e., b_+^2/b_-^2 \propto (\epsilon _+/\epsilon _-)^n with n > 2). These results are consistent with those obtained for imbalanced non-relativistic Alfvénic turbulence. This corresponds well to the earlier reported similarity of the relativistic and non-relativistic balanced magnetic turbulence.
Tags Magnetohydrodynamics: MHD, relativistic processes, turbulence
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