Life under a black sun
Abstract
Life is dependent on the income of energy with low entropy and the disposal of energy with high entropy. On Earth, the low-entropy energy is provided by solar radiation and the high-entropy energy is disposed as infrared radiation emitted into the cold space. Here we turn the situation around and assume cosmic background radiation as the low-entropy source of energy for a planet orbiting a black hole into which the high-entropy energy is disposed. We estimate the power that can be produced by thermodynamic processes on such a planet, with a particular interest in planets orbiting a fast rotating Kerr black hole as in the science fiction movie {\em Interstellar}. We also briefly discuss a reverse Dyson sphere absorbing cosmic background radiation from the outside and dumping waste energy to a black hole inside.
Cite
@article{arxiv.1601.02897,
title = {Life under a black sun},
author = {Tomáš Opatrný and Lukáš Richterek and Pavel Bakala},
journal= {arXiv preprint arXiv:1601.02897},
year = {2017}
}
Comments
8 pages, 6 figures. Replaced with the version published in Am. J. Phys