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Gravitational Machines
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Gravitational Machines
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A gravitational machine is defined as an arrangement of gravitating masses from which useful energy can be extracted. It is shown that such machines may exist if the masses are of normal astronomical size. A simple example of a gravitational machine, consisting of a double star with smaller masses orbiting around it, is described. It is shown that an efficient gravitational machine will also be an emitter of gravitational radiation. The emitted radiation sets a limit on the possible performance of gravitational machines, and also provides us with a possible means for detecting such machines if they exist.
Forward citations
Cited by 3 Pith papers
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Nonlinear Dynamics near the Threshold of Gravitational Collapse
Perturbation theory around flat space fails before black hole formation once peak luminosity exceeds ~10^-2 L_Planck; near criticality the spectrum flattens to 1/ω, matching the prediction from discrete self-similarity.
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The weight of light: colliding pulses of radiation in General Relativity
Focused pulses of electromagnetic radiation can self-gravitate into black holes and, just below the collapse threshold, into ultracompact horizonless states whose measured compactness exceeds the hoop-conjecture value.
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The Dyson Minds 2025 Workshop: SETI around Black Holes
A workshop report recommends anomaly detection on existing telescope data to search for technosignatures from advanced minds powered by supermassive black holes.
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