Black Hole Dyson Spheres: Harvesting Disk and Jet Energy Toward Beyond-Type II Civilizations

To the point

A Dyson bubble around a black hole could harvest energy from the accretion disk and jets to power a civilization beyond Type II or even Type III, with the absorbed energy re-emitted as infrared waste heat that telescopes could detect, as shown by Tiger Yu-Yang Hsiao and Tomotsugu Goto in models of spinning and non-spinning black holes.

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Harvesting Black Holes to power a civilization
astrobites.org

Harvesting Black Holes to power a civilization

Like humanity, alien civilizations need to harvest energy. But how to power your civilization, if the energy of a star is not enough? Todays authors discuss a fascinating prospect: Harvesting the energy of black holes with Dyson spheres.