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Planck frequencies as Schelling points in SETI
International Journal of Astrobiology ( IF 1.7 ) Pub Date : 2020-11-19 , DOI: 10.1017/s1473550420000324
Jason T. Wright

In SETI, when searching for"beacons"-- transmissions intended for us and meant to get our attention -- one must guess the appropriate frequency to search by considering what frequencies would be universally obvious to other species. This is a well known concept in game theory, where such solutions to a non-communicative cooperative game (such as a mutual search) are called"Schelling points."It is noteworthy, therefore, that when developing his eponymous units, Planck called them"natural"because they"remain meaningful for all times and also for extraterrestrial and non-human cultures."Here, I apply Planck's suggestion in the context of Schelling points in SETI with a"Planck Frequency Comb,"constructed by multiplying the Planck energy by integer powers of the fine structure constant. This comb includes a small number of frequencies in regions of the electromagnetic spectrum where laser and radio SETI typically operates. Searches might proceed and individual teeth in the comb, or at many teeth at once, across the electromagnetic spectrum. Indeed, the latter strategy can be additionally justified by the transmitter's desire to signal at many frequencies at once, to improve the chances that the receiver will guess one of them correctly. There are many arbitrary and anthropocentric choices in this comb's construction, and indeed one can construct several different frequency combs with only minor and arbitrary modifications. This suggests that it may be fruitful to search for signals arriving in frequency combs of arbitrary spacing. And even though the frequencies suggested here are only debatably"better"than others proposed, the addition of the Planck Frequency Comb to the list of"magic frequencies"can only help searches for extraterrestrial beacons.

中文翻译:

普朗克频率作为 SETI 中的谢林点

在 SETI 中,当搜索“信标”——旨在引起我们注意的传输信号时——人们必须通过考虑其他物种普遍显而易见的频率来猜测合适的搜索频率。这是博弈论中的一个众所周知的概念,其中非通信合作博弈(例如相互搜索)的此类解决方案称为“谢林点”。因此,值得注意的是,在开发他的同名单元时,普朗克将它们称为“自然”,因为它们“对所有时代以及外星和非人类文化都具有意义。”在这里,我将普朗克的建议应用到 SETI 中的谢林点的上下文中,并带有“普朗克频率梳”,它是通过乘以普朗克能量构建的通过精细结构常数的整数次幂。这种梳子包括电磁频谱区域中的少量频率,激光和无线电 SETI 通常在这些区域工作。搜索可能会在整个电磁频谱中进行,梳子中的单个牙齿,或同时搜索多个牙齿。事实上,后一种策略还可以通过发射器同时在多个频率上发出信号的愿望来证明,以提高接收器正确猜测其中一个频率的机会。在这个梳子的构造中有许多任意的和以人类为中心的选择,事实上,一个人可以构造几个不同的频率梳,只需要很小的和任意的修改。这表明搜索到达任意间隔频率梳的信号可能是富有成效的。即使这里建议的频率只是有争议的“更好”
更新日期:2020-11-19
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