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Long-term implications of observing an expanding cosmological civilization

Published online by Cambridge University Press:  17 May 2017

S. Jay Olson
S. Jay Olson*
Affiliation:
Department of Physics Boise State University 1910 University Drive Boise, Idaho 83725-1570, USA
*
e-mail: [email protected]
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Abstract

Suppose that advanced civilizations, separated by a cosmological distance and time, wish to maximize their access to cosmic resources by rapidly expanding into the universe. How does the presence of one limit the expansionistic ambitions of another, and what sort of boundary forms between their expanding domains? We describe a general scenario for any expansion speed, separation distance and time. We then specialize to a question of particular interest: What are the future prospects for a young and ambitious civilization if they can observe the presence of another at a cosmological distance? We treat cases involving the observation of one or two expanding domains. In the single-observation case, we find that almost any plausible detection will limit one's future cosmic expansion to some extent. Also, practical technological limits to expansion speed (well below the speed of light) play an interesting role. If a domain is visible at the time one embarks on cosmic expansion, higher practical limits to expansion speed are beneficial only up to a certain point. Beyond this point, a higher speed limit means that gains in the ability to expand are more than offset by the first-mover advantage of the observed domain. In the case of two visible domains, it is possible to be ‘trapped’ by them if the practical speed limit is high enough and their angular separation in the sky is large enough, i.e. one's expansion in any direction will terminate at a boundary with the two visible civilizations. Detection at an extreme cosmological distance has surprisingly little mitigating effect on our conclusions.

Keywords

extragalctic SETIdetectionexpansion
Type
Research Article
Information
International Journal of Astrobiology , Volume 17 , Issue 1 , January 2018 , pp. 87 - 95
Copyright
Copyright © Cambridge University Press 2017 

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References

Annis, J. (1999). Placing a limit on star-fed kardashev type iii civilisations. J. Br. Interplanet. Soc. 52, 33–36.Google Scholar
Armstrong, S. & Sandberg, A. (2013). Eternity in six hours: intergalactic spreading of intelligent life and sharpening the fermi paradox. Acta Astronaut. 89, 1–13.Google Scholar
Ball, J.A. (1973). The zoo hypothesis. Icarus 190(3), 347–349.Google Scholar
Bostrom, N. (2012). The superintelligent will: motivation and instrumental rationality in advanced artificial agents. Minds Mach. 220(2), 71–85.Google Scholar
Bostrom, N. (2014). Superintelligence: Paths, Dangers, Strategies. Oxford University Press, Oxford.Google Scholar
Croton, D.J., Springel, V., White, S.D., De Lucia, G., Frenk, C.S., Gao, L., Jenkins, A., Kauffmann, G., Navarro, J. & Yoshida, N. (2006). The many lives of active galactic nuclei: cooling flows, black holes and the luminosities and colours of galaxies. Mon. Not. R. Astron. Soc. 3650(1), 11–28.Google Scholar
Fogg, M. (1988). Feasibility of intergalactic colonisation and its relevance to SETI. J. Br. Interplanet. Soc. 41, 491–496.Google Scholar
Gertz, J. (2016). Reviewing meti: a critical analysis of the arguments. arXiv preprint arXiv:1605.05663.Google Scholar
Griffith, R., Wright, J., Maldonado, J., Povich, M.S., Sigurdjsson, S. & Mullan, B. (2015). The $\hat {\rm g}$ infrared search for extraterrestrial civilizations with large energy supplies. iii. the reddest extended sources in wise. Astrophys. J. Suppl. Ser. 2170(2), 25.Google Scholar
Hart, M.H. (1975). Explanation for the absence of extraterrestrials on earth. Q. J. R. Astron. Soc. 16, 128.Google Scholar
Jones, E.M. (1976). Colonization of the galaxy. Icarus 280(3), 421–422.Google Scholar
Kardashev, N.S. (1964). Transmission of information by extraterrestrial civilizations. Sov. Astron. 8, 217.Google Scholar
Lacki, B.C. (2016). Type iii societies (apparently) do not exist. arXiv preprint arXiv:1604.07844.Google Scholar
Merali, Z. (2016). Shooting for a star. Science 3520(6289), 1040–1041.Google Scholar
Olson, S.J. (2015). Homogeneous cosmology with aggressively expanding civilizations. Class. Quantum Gravity 320(21), 215025. URL http://arxiv.org/abs/1411.4359.Google Scholar
Olson, S.J. (2016a). Estimates for the number of visible galaxy-spanning civilizations and the cosmological expansion of life. Int. J. Astrobiol., FirstView: 1–9, 4. ISSN 1475-3006. doi: 10.1017/S1473550416000082.Google Scholar
Olson, S.J. (2016b). On the visible size and geometry of aggressively expanding civilizations at cosmological distances. J. Cosmol. Astropart. Phys. 20160(4), 021.Google Scholar
Omohundro, S.M. (2008). The basic ai drives. In Artificial General Intelligence 2008: Proceedings of the First AGI Conference, ed. Wang, P., Goertzel, B. & Franklin, S., pp. 483–492. Frontiersin Artificial Intelligence and Applications 171. IOS, Amsterdam.Google Scholar
Sagan, C. & Newman, W.I. (1983). The solipsist approach to extraterrestrial intelligence. Q. J. R. Astron. Soc. 24, 113.Google Scholar
Springel, V. et al. (2005). Simulations of the formation, evolution and clustering of galaxies and quasars. Nature 4350(7042), 629–636.Google Scholar
Tipler, F.J. (1980). Extraterrestrial intelligent beings do not exist. Q. J. R. Astron. Soc. 21, 267–281.Google Scholar
Valdes, F. & Freitas, R. (1980). Comparison of reproducing and nonreproducing starprobe strategies for galactic exploration. Br. Interplanet. Soc. J.(Interstellar Studies) 33, 402–406.Google Scholar
Villarroel, B., Imaz, I. & Bergstedt, J. (2016). Our sky now and then –searches for lost stars and impossible effects as probes of advanced extra-terrestrial civilisations. Astron. J., In press.Google Scholar
Wright, J., Griffith, R., Sigurdsson, S., Povich, M. & Mullan, B. (2014). The g infrared search for extraterrestrial civilizations with large energy supplies. ii. framework, strategy, and first result. Astrophys. J. 7920(1), 27.Google Scholar
Zackrisson, E., Calissendorff, P., Asadi, S. & Nyholm, A. (2015). Extragalactic seti: the tully–fisher relation as a probe of dysonian astroengineering in disk galaxies. Astrophys. J. 8100(1), 23.Google Scholar