A Dyson sphere around a black hole

Hsiao, Tiger Yu Yang and Goto, Tomotsugu and Hashimoto, Tetsuya and Santos, Daryl Joe D. and On, Alvina Y. L. and Kilerci Eser, Ece and Wong, Yi Hang Valerie and Kim, Seong Jin and Wu, Cossas K-W and Ho, Simon C-C and Lu, Ting-Yi (2021) A Dyson sphere around a black hole. Monthly Notices of the Royal Astronomical Society, 506 (2). pp. 1723-1732. ISSN 0035-8711 (Print) 1365-2966 (Online)

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The search for extraterrestrial intelligence (SETI) has been conducted for nearly 60 yr. A Dyson sphere, a spherical structure that surrounds a star and transports its radiative energy outwards as an energy source for an advanced civilization, is one of the main targets of SETI. In this study, we discuss whether building a Dyson sphere around a black hole is effective. We consider six energy sources: (i) the cosmic microwave background, (ii) the Hawking radiation, (iii) an accretion disc, (iv) Bondi accretion, (v) a corona, and (vi) relativistic jets. To develop future civilizations (for example, a Type II civilization), 4×1026W(1L⊙) is expected to be needed. Among (iii) to (vi), the largest luminosity can be collected from an accretion disc, reaching 105L⊙⁠, enough to maintain a Type II civilization. Moreover, if a Dyson sphere collects not only the electromagnetic radiation but also other types of energy (e.g. kinetic energy) from the jets, the total collected energy would be approximately 5 times larger. Considering the emission from a Dyson sphere, our results show that the Dyson sphere around a stellar-mass black hole in the Milky Way (⁠10kpc away from us) is detectable in the ultraviolet (10−400nm)⁠, optical (400−760nm)⁠, near-infrared (⁠760nm−5μm⁠), and mid-infrared (⁠5−40μm⁠) wavelengths via the waste heat radiation using current telescopes such as Galaxy Evolution Explorer Ultraviolet Sky Surveys. Performing model fitting to observed spectral energy distributions and measuring the variability of radial velocity may help us to identify these possible artificial structures.
Item Type: Article
Uncontrolled Keywords: extraterrestrial intelligence, accretion, accretion discs, space vehicles, stars black holes, quasars supermassive black holes.
Subjects: Q Science > QB Astronomy > QB460-466 Astrophysics
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Ece Kilerci
Date Deposited: 28 Aug 2021 14:10
Last Modified: 29 Aug 2022 21:27
URI: https://research.sabanciuniv.edu/id/eprint/42091

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