English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We investigate mechanisms of energy extraction from a rotating black hole interms of negative energy-at-infinity. In addition to the Penrose processthrough particle fission, the Blandford-Znajek mechanism by magnetic tension,and the magnetohydrodynamic Penrose process, we examine energy extraction froma black hole caused by magnetic reconnection in the ergosphere. Thereconnection redistributes the angular momentum efficiently to yield thenegative energy-atinfinity. We derive a condition for the process to operate ina simple situation, where the plasma is incompressible and the magnetic energyis converted completely to the plasma kinetic energy locally. Astrophysicalsituations of magnetic reconnection around the black holes are also discussed.

Energy Extraction from a Rotating Black Hole by Magnetic Reconnection in Ergosphere