Linear analysis of the Kelvin–Helmholtz instability in relativistic magnetized symmetric flows
Linear analysis of the Kelvin–Helmholtz instability in relativistic magnetized symmetric flows
复制标题
相对论磁化对称流中开尔文亥姆霍兹不稳定性的线性分析
DOI:
10.1093/mnras/stad1833
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发表时间:
2023
影响因子:
4.8
通讯作者:
Narayan, Ramesh
中科院分区:
文献类型:
--
作者:
Chow, Anthony;Rowan, Michael E.;Sironi, Lorenzo;Davelaar, Jordy;Bodo, Gianluigi;Narayan, Ramesh
We study the linear stability of a planar interface separating two fluids in relative motion, focusing on the symmetric configuration where the two fluids have the same properties (density, temperature, magnetic field strength, and direction). We consider the most general case with arbitrary sound speedcs, Alfvén speedvA, and magnetic field orientation. For the instability associated with the fast mode, we find that the lower bound of unstable shear velocities is set by the requirement that the projection of the velocity on to the fluid-frame wavevector is larger than the projection of the Alfvén speed on to the same direction, i.e. shear should overcome the effect of magnetic tension. In the frame where the two fluids move in opposite directions with equal speedv, the upper bound of unstable velocities corresponds to an effective relativistic Mach number $M_{\rm re}\equiv v/v_{\rm {f}\perp }\sqrt{(1-v_{\rm {f}\perp }^2)/(1-v^2)} \cos \theta =\sqrt{2}$, whereis the fast speed assuming a magnetic field perpendicular to the wavevector (here, all velocities are in units of the speed of light), and θ is the laboratory-frame angle between the flow velocity and the wavevector projection on to the shear interface. Our results have implications for shear flows in the magnetospheres of neutron stars and black holes – both for single objects and for merging binaries – where the Alfvén speed may approach the speed of light.
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影响因子:
4.8
作者:
B. Turland;P. Scheuer
通讯作者:
P. Scheuer
DOI:
10.1051/0004-6361:200809605
发表时间:
2008
期刊:
arXiv: Astrophysics
影响因子:
--
作者:
Z. Osmanov;A. Mignone;S. Massaglia;G. Bodo;A. Ferrari
通讯作者:
A. Ferrari
DOI:
10.1093/mnras/stx2592
发表时间:
2017
期刊:
arXiv: High Energy Astrophysical Phenomena
影响因子:
--
作者:
E. Sobacchi;Y. Lyubarsky
通讯作者:
Y. Lyubarsky
DOI:
10.1086/163981
发表时间:
1986
期刊:
The Astrophysical Journal
影响因子:
--
作者:
S. Roychoudhury;R. Lovelace
通讯作者:
R. Lovelace
影响因子:
4.8
作者:
R. Blandford;J. Pringle
通讯作者:
J. Pringle