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Comment on Black Holes as a cooling system for advanced civilisations?

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You're going to have some major practical trade-offs with this choice of cooling system. For one thing, any data you get out of this computer when you're positioned further away from the event horizon is going to be red-shifted down to a lower data rate.

For another thing, the electrical and magnetic fields generated by your computing and data transmitting hardware are going to induce a Lorentz force on the event horizon and torque it into rotation, which in turn produces both gravitational frame dragging and dissipation. Now it's a lot hotter than if it were just a Schwarzchild black hole emitting only Hawking radiation.

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