• Corpus ID: 233025167

The Edges of Our Universe

@inproceedings{Ord2021TheEO,
  title={The Edges of Our Universe},
  author={Toby Ord},
  year={2021}
}
  • Toby Ord
  • Published 2 April 2021
  • Philosophy, Physics
This paper explores the fundamental causal limits on how much of the universe we can observe or affect. It distinguishes four principal regions: the affectable universe, the observable universe, the eventually observable universe, and the ultimately observable universe. It then shows how these (and other) causal limits set physical bounds on what spacefaring civilisations could achieve over the longterm future. 
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References

SHOWING 1-10 OF 22 REFERENCES
Time without end: Physics and biology in an open universe
TLDR
The general conclusion of the analysis is that an open universe need not evolve into a state of permanent quiescence and life and communication can continue for ever, utilizing a finite store of energy, if the assumed scaling laws are valid.
The Cosmic Energy Inventory
We present an inventory of the cosmic mean densities of energy associated with all the known states of matter and radiation at the present epoch. The observational and theoretical bases for the
Comment on ‘The Aestivation Hypothesis for Resolving Fermi’s Paradox’
In their article, ‘That is not dead which can eternal lie: the aestivation hypothesis for resolving Fermi’s paradox’, Sandberg et al. try to explain the Fermi paradox (we see no aliens) by claiming
Misconceptions about the big bang.
TLDR
The article discusses common misconceptions about the Big Bang theory and the expansion of the universe and the key to avoiding the misunderstandings is not to take the term "big bang" too literally.
Long-term implications of observing an expanding cosmological civilization
  • S. J. Olson
  • Physics
    International Journal of Astrobiology
  • 2017
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
That is not dead which can eternal lie: the aestivation hypothesis for resolving Fermi's paradox
TLDR
This paper analyzes the assumptions going into the "aestivation hypothesis" and how physical law and observational evidence constrain the motivations of aliens compatible with the hypothesis.
Estimates for the number of visible galaxy-spanning civilizations and the cosmological expansion of life
  • S. J. Olson
  • Physics
    International Journal of Astrobiology
  • 2016
Abstract If advanced civilizations appear in the universe with an ability and desire to expand, the entire universe can become saturated with life on a short timescale, even if such expanders appear
On the visible size and geometry of aggressively expanding civilizations at cosmological distances
If a subset of advanced civilizations in the universe choose to rapidly expand into unoccupied space, these civilizations would have the opportunity to grow to a cosmological scale over the course of
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