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Matter and Electromagnetic Fields in Strong Gravity

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Energy Extraction of Rotating Black Hole by Magnetic Reconnection

Shinji Koide

Kumamoto University, Japan


Abstract:   We review mechanisms of energy extraction from a rotating black hole in terms of negative energy-at-infinity. Especially, we examine energy extraction from a black hole caused by magnetic reconnection in the ergosphere. The reconnection redistributes the angular momentum efficiently to induce the negative energy-at-infinity like particle fission of the Penrose process. We derive a condition for the process to operate in a simple situation, where the plasma is incompressible and the magnetic energy is converted completely to the plasma kinetic energy locally. It shows that relativistic magnetic reconnection is required to induce the negative energy-at-infinity. To calculate the relativistic magnetic reconnection, we have to use resistive relativistic MHD (resistive RMHD), because the magnetic reconnection is caused by local electric resistivity at a X-point. We also show the causality problem of the standard resistive RMHD and propose a set of generalized RMHD to fix it.

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