<i>IRAS</i>-BASED WHOLE-SKY UPPER LIMIT ON DYSON SPHERES

Carrigan, Richard A.

doi:10.1088/0004-637x/698/2/2075

Cited by 75 publications

(55 citation statements)

References 26 publications

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“…Unfortunately, despite some searches, the results are negative (Jugaku, Noguchi, and Nishimura 1995;Carrigan Jr 2009;Wright et al 2014). We thus lack proof or even indication of ETI, a fundamental gap in our knowledge of the universe.…”

Section: -Introductionmentioning

confidence: 93%

Stellivore extraterrestrials? Binary stars as living systems

Vidal

2016

Acta Astronautica

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We lack signs of extraterrestrial intelligence (ETI) despite decades of observation in the whole electromagnetic spectrum. Could evidence be buried in existing data? To recognize ETI, we first propose criteria discerning life from non-life based on thermodynamics and living systems theory. Then we extrapolate civilizational development to both external and internal growth. Taken together, these two trends lead to an argument that some existing binary stars might actually be ETI. Since these hypothetical beings feed actively on stars, we call them "stellivores". We present an independent thermodynamic argument for their existence, with a metabolic interpretation of interacting binary stars. The jury is still out, but the hypothesis is empirically testable with existing astrophysical data.

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Section: -Introductionmentioning

confidence: 93%

Stellivore extraterrestrials? Binary stars as living systems

Vidal

2016

Acta Astronautica

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“…Waste Heat A mid-infrared map with sufficiently high sensitivity might allow one to conduct a waste heat search for civilizations (Dyson 1960;Carrigan 2009;Wright et al 2014a) by looking for industrial heat signatures on the planetary surface. For instance, Kuhn and Berdyugina (2015) suggested that a 70m telescope might be sufficient to detect the rotationally modulated localized output of industry on an Earth-like planet for a civilization with ∼ 25 times the energy supply of humanity (which is equal to about 1% of light the planet intercepts from its star).…”

Section: Technosignatures On Exoplanets and The Host Starsmentioning

confidence: 99%

Exoplanets and SETI

Wright

2018

Handbook of Exoplanets

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The discovery of exoplanets has both focused and expanded the search for extraterrestrial intelligence. The consideration of Earth as an exoplanet, the knowledge of the orbital parameters of individual exoplanets, and our new understanding of the prevalence of exoplanets throughout the galaxy have all altered the search strategies of communication SETI efforts, by inspiring new "Schelling points" (i.e. optimal search strategies for beacons). Future efforts to characterize individual planets photometrically and spectroscopically, with imaging and via transit, will also allow for searches for a variety of technosignatures on their surfaces, in their atmospheres, and in orbit around them. In the near-term, searches for new planetary systems might even turn up free-floating megastructures.

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“…Many of the past searches for Dyson Spheres have focused on detecting the presence of structures around individual stars within the Milky Way (for example, Refs. [5,21,22]).…”

Section: New Observational Signatures Of Advanced Civilizationsmentioning

confidence: 99%

Life versus dark energy: How an advanced civilization could resist the accelerating expansion of the universe

Hooper

2018

Physics of the Dark Universe

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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 ∼ (0.2 − 1)M , 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. We also discuss the observable signatures of a civilization elsewhere in the universe that is currently in this state of stellar harvesting.

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IRAS-BASED WHOLE-SKY UPPER LIMIT ON DYSON SPHERES

Cited by 75 publications

References 26 publications

Stellivore extraterrestrials? Binary stars as living systems

Stellivore extraterrestrials? Binary stars as living systems

Exoplanets and SETI

Life versus dark energy: How an advanced civilization could resist the accelerating expansion of the universe

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