Life versus dark energy: How an advanced civilization could resist the accelerating expansion of the universe
We present that the presence of dark energy in our universe is causing space to expand at an accelerating rate. As a result, over the next approximately 100 billion years, all stars residing beyond the Local Group will fall beyond the cosmic horizon and become not only unobservable, but entirely inaccessible, thus limiting how much energy could one day be extracted from them. Here, we consider the likely response of a highly advanced civilization to this situation. In particular, we argue that in order to maximize its access to useable energy, a sufficiently advanced civilization would chose to expand rapidly outward, build Dyson Spheres or similar structures around encountered stars, and use the energy that is harnessed to accelerate those stars away from the approaching horizon and toward the center of the civilization. We find that such efforts will be most effective for stars with masses in the range of $$M\sim (0.2-1) M_{\odot}$$, and could lead to the harvesting of stars within a region extending out to several tens of Mpc in radius, potentially increasing the total amount of energy that is available to a future civilization by a factor of several thousand. Lastly, we also discuss the observable signatures of a civilization elsewhere in the universe that is currently in this state of stellar harvesting.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Grant/Contract Number:
- AC02-07CH11359; FG02-13ER41958; SC0009924
- OSTI ID:
- 1462730
- Alternate ID(s):
- OSTI ID: 1637151
- Report Number(s):
- arXiv:1806.05203; FERMILAB-PUB-18-254-A; 1677930; TRN: US1902209
- Journal Information:
- Physics of the Dark Universe, Vol. 22, Issue C; ISSN 2212-6864
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Habitable Zones around Almost Extremely Spinning Black Holes (Black Sun Revisited)
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journal | January 2020 |
| Habitable zones around almost extremely spinning black holes (black sun revisited) | text | January 2020 |
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