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Title: Collisionless magnetic reconnection in curved spacetime and the effect of black hole rotation

Abstract

Magnetic reconnection in curved spacetime is studied in this paper by adopting a general-relativistic magnetohydrodynamic model that retains collisionless effects for both electron-ion and pair plasmas. A simple generalization of the standard Sweet-Parker model allows us to obtain the first-order effects of the gravitational field of a rotating black hole. It is shown that the black hole rotation acts to increase the length of azimuthal reconnection layers, thus leading to a decrease of the reconnection rate. However, when coupled to collisionless thermal-inertial effects, the net reconnection rate is enhanced with respect to what would happen in a purely collisional plasma due to a broadening of the reconnection layer. Finally, these findings identify an underlying interaction between gravity and collisionless magnetic reconnection in the vicinity of compact objects.

Authors:
 [1];  [2]
  1. Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Adolfo Ibanez Univ., Santiago (Chile). Faculty of Engineering and Sciences
Publication Date:
Research Org.:
Adolfo Ibanez Univ., Santiago (Chile); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE; National Fund for Scientific and Technological Development (FONDECYT) (Chile)
OSTI Identifier:
1423783
Grant/Contract Number:  
11140025
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 4; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; general relativity; magnetic reconnection; accretion disk & black-hole plasma; classical black holes; plasma physics

Citation Formats

Comisso, Luca, and Asenjo, Felipe A. Collisionless magnetic reconnection in curved spacetime and the effect of black hole rotation. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.97.043007.
Comisso, Luca, & Asenjo, Felipe A. Collisionless magnetic reconnection in curved spacetime and the effect of black hole rotation. United States. doi:10.1103/PhysRevD.97.043007.
Comisso, Luca, and Asenjo, Felipe A. Mon . "Collisionless magnetic reconnection in curved spacetime and the effect of black hole rotation". United States. doi:10.1103/PhysRevD.97.043007. https://www.osti.gov/servlets/purl/1423783.
@article{osti_1423783,
title = {Collisionless magnetic reconnection in curved spacetime and the effect of black hole rotation},
author = {Comisso, Luca and Asenjo, Felipe A.},
abstractNote = {Magnetic reconnection in curved spacetime is studied in this paper by adopting a general-relativistic magnetohydrodynamic model that retains collisionless effects for both electron-ion and pair plasmas. A simple generalization of the standard Sweet-Parker model allows us to obtain the first-order effects of the gravitational field of a rotating black hole. It is shown that the black hole rotation acts to increase the length of azimuthal reconnection layers, thus leading to a decrease of the reconnection rate. However, when coupled to collisionless thermal-inertial effects, the net reconnection rate is enhanced with respect to what would happen in a purely collisional plasma due to a broadening of the reconnection layer. Finally, these findings identify an underlying interaction between gravity and collisionless magnetic reconnection in the vicinity of compact objects.},
doi = {10.1103/PhysRevD.97.043007},
journal = {Physical Review D},
number = 4,
volume = 97,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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Citation Metrics:
Cited by: 2 works
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Figures / Tables:

FIG. 1 FIG. 1: Sketch of a reconnection layer in the azimuthal direction around a rotating black hole. The shaded orange area represents a narrow ($\delta$ $\ll$ $L$) magnetic di usion region.

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