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Observations of the Blandford-Znajek and the MHD Penrose processes in computer simulations of black hole magnetospheres

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arxiv astro-ph/0501599 v1 pith:OR6OYSTI submitted 2005-01-27 astro-ph

S. S. Komissarov This is my paper · ORCID
classification astro-ph
keywords blackholemagneticrelativisticsimulationsenergyergospherefield
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In this paper we report the results of axisymmetric relativistic MHD simulations for the problem of Kerr black hole immersed into a rarefied plasma with ''uniform'' magnetic field. The long term solution shows properties which are significantly different from those of the initial transient phase studied recently by Koide(2003). The topology of magnetic field lines within the ergosphere is similar to that of the split-monopole model with a strong current sheet in the equatorial plane. Closer inspection reveals a system of isolated magnetic islands inside the sheet and ongoing magnetic reconnection. No regions of negative hydrodynamic ''energy at infinity'' are seen inside the ergosphere and the so-called MHD Penrose process does not operate. Yet, the rotational energy of the black hole continues to be extracted via purely electromagnetic mechanism of Blandford and Znajek(1977). However, this is not followed by development of strong relativistic outflows from the black hole. Combined with results of other recent simulations this signals a potential problem for the standard MHD model of relativistic astrophysical jets should they still be observed at distances as small as few tens of gravitational radii from the central black hole.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Universality of the Blandford-Znajek emission in stationary and axisymmetric spacetimes

    gr-qc 2026-02 conditional novelty 7.0 of 10

    The Blandford-Znajek jet luminosity is universal (∝Ω_h²) at leading order across parametric black-hole spacetimes and spacetime-dependent at next order, breaking the low-spin degeneracy for rapidly rotating holes.

  2. Magnetic Field Configurations in Binary Neutron Star Mergers II: Inspiral, Merger and Ejecta

    astro-ph.HE 2025-08 conditional novelty 6.0 of 10

    Initial magnetic field topology, especially anti-aligned poloidal fields, strongly controls post-merger field amplification and ejecta magnetisation in neutron star merger simulations.

  3. Distinct Near-Horizon Trend of Synchrotron Polarization in Kerr Spacetime

    gr-qc 2026-06 unverdicted novelty 5.0 of 10

    Near-horizon synchrotron polarization in Kerr spacetime admits a distinct analytic form where the leading-order pattern depends only on spin and polar angle under stationary axisymmetric degenerate EM field assumptions.

  4. Energy extraction from NED-deformed rotating black holes via the Comisso-Asenjo reconnection process

    gr-qc 2026-05 unverdicted novelty 5.0 of 10

    Derives spin-dependent bounds on NED deformation g/M from Sgr A* shadow, eikonal QNMs, and Comisso-Asenjo reconnection power in rotating geometries.

  5. Neutrino pair annihilation driven jets from black-hole torus systems

    astro-ph.HE 2025-06 conditional novelty 5.0 of 10

    Neutrino pair annihilation in black hole-torus systems launches relativistic fireballs with isotropic energies up to about 10^51 erg and durations around 0.1 s, which can account for faint short GRBs and GRB precursors.

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