Radio Flare Studies at 4 CM.

Papagiannis, Michael D.; Wefer, Fred L.

doi:10.21236/ada052360

Cited by 6 publications

(7 citation statements)

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“…Of course, it may well be the case that an interstellar probe is in the outer solar system, and we have not yet found it (Papagiannis, 1978;Freitas, 1983). While this is indeed plausible, the possible places for an interstellar probe to hide continues to decrease (see also Haqq-Misra & Kopparapu, 2012).…”

Section: Introductionmentioning

confidence: 76%

Predator-prey behaviour in self-replicating interstellar probes

Forgan

2019

International Journal of Astrobiology

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The concept of a rapid spread of self-replicating interstellar probes (SRPs) throughout the Milky Way adds considerable strength to Fermi's Paradox. A single civilisation creating a single SRP is sufficient for a fleet of SRPs to grow and explore the entire Galaxy on timescales much shorter than the age of the Earth -so why do we see no signs of such probes? One solution to this Paradox suggests that self-replicating probes eventually undergo replication errors and evolve into predator-prey populations, reducing the total number of probes and removing them from our view.I apply Lotka-Volterra models of predator-prey competition to interstellar probes navigating a network of stars in the Galactic Habitable Zone to investigate this scenario. I find that depending on the local growth mode of both populations and the flow of predators/prey between stars, there are many stable solutions with relatively large numbers of prey probes inhabiting the Milky Way. The solutions can exhibit the classic oscillatory pattern of Lotka-Volterra systems, but this depends sensitively on the input parameters. Typically, local and global equilibria are established, with prey sometimes outnumbering the predators. Accordingly, we find this solution to Fermi's Paradox does not reduce the probe population sufficiently to be viable.

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Section: Introductionmentioning

confidence: 76%

Predator-prey behaviour in self-replicating interstellar probes

Forgan

2019

International Journal of Astrobiology

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“…Others argued that the galactic colonization has either not occurred because it is too expensive to be of any use [28], or that it has not yet been completed because it is a very slow process [29]. Others, on the other hand, have argued that extraterrestrials might have colonized our own Solar System, living probably in far away space colonies, but for certain reasons [30], [31] they have chosen not to make their presence known.…”

Section: Discussion On Strategiesmentioning

confidence: 99%

Commission 51: Search for Extraterrestrial Life

Papagiannis¹,

Drake²,

Kardashëv³

et al. 1985

Trans. Int. Astron. Union

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The possibility that life, primitive or advanced, might exist in other places of the Universe has occupied the minds of scientists and lay-people for thousands of years. It is only in the last 25 years, however, that we have finally begun to search for answers to this profound question using experimental techniques. The goal of Astronomy is to understand the origin and evolution of planets, stars, galaxies and of the Universe as a whole. The appearance of life is an integral part of this whole process and our picture of the Universe will never be complete until we will comprehend also the significance of life in the process of Cosmic Evolution.

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“…The postulation of alien probes inside the solar system is interesting, but more is required to narrow down the most likely locations. Generic "Lurkers" have been proposed to be located on nearby co-orbital objects (Steel 1995(Steel , 1998Benford 2019) for surveillance, near the Earthmoon Lagrangian points (Freitas & Valdes 1980;Valdes & Freitas 1983), in geocentric, selenocentric, Earth-Moon libration, and Earth-Moon halo orbits (Freitas 1983), in a tight orbit around the Sun (Gertz 2018), in the asteroid belt (Papagiannis 1978;Forgan & Elvis 2011), the Kuiper belt (Loeb & Turner 2012), on the surface of the moon (Davies & Wagner 2013;Wagner et al 2017), on Earth (Davies 2012) or anywhere in the solar system (Gertz 2016a(Gertz , 2017.…”

Section: The Importance Of Making Assumptionsmentioning

confidence: 99%

Interstellar Communication Network. I. Overview and Assumptions

Hippke¹

2020

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It has recently been suggested in this journal by Benford (2019) that "Lurkers" in the form of interstellar exploration probes could be present in the solar system. Similarly, extraterrestrial intelligence could send long-lived probes to many other stellar systems, to report back science and surveillance. If probes and planets with technological species exist in more than a handful of systems in our galaxy, it is beneficial to use a coordinated communication scheme. Due to the inverse square law, data rates decrease strongly for direct connections over long distances. The network bandwidth could be increased by orders of magnitude if repeater stations (nodes) are used in an optimized fashion. This introduction to a series of papers makes the assumptions of the communication scheme explicit. Subsequent papers will discuss technical aspects such as transmitters, repeaters, wavelengths, and power levels. The overall purpose is to gain insight into the physical characteristics of an interstellar communication network, allowing us to describe the most likely sizes and locations of nodes and probes.

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Radio Flare Studies at 4 CM.

Cited by 6 publications

References 0 publications

Predator-prey behaviour in self-replicating interstellar probes

Predator-prey behaviour in self-replicating interstellar probes

Commission 51: Search for Extraterrestrial Life

Interstellar Communication Network. I. Overview and Assumptions

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