利用历史超新星寻找银河文明
Search for Galactic Civilizations Using Historical Supernovae
摘要：
我们研究了最初由Seto（2019）提出的星际信令方案，该方案通过引人注目的天文突发有效地将有意发射机与ETI搜索者联系起来，而无需事先通信。基于几何和博弈论的观点，该方案可以被改进，使得可以在观察到参考突发之后发送和接收有意的信号，与原始提议（在观察突发之前）相反。鉴于这种颠倒的时间结构，在过去2000年中记录的银河系超新星可以被视为ETI搜索的有趣路标。虽然SN 393的最佳使用期大概在100年前就已经过了$\sim$，但一些历史上的超新星可能使我们能够将ETI的调查区域压缩到不到一个$\sim$的存在，大约在天空中的两个环周围。
英文摘要：
We study an interstellar signaling scheme which was originally proposed by Seto (2019) and efficiently links intentional transmitters to ETI searchers through a conspicuous astronomical burst, without prior communication. Based on the geometrical and game theoretic viewpoints, the scheme can be refined so that intentional signals can be sent and received after observing a reference burst, in contrast to the original proposal (before observing a burst). Given this inverted temporal structure, Galactic supernovae recorded in the past 2000 years can be regarded as interesting guideposts for an ETI search. While the best use period of SN 393 has presumably passed $\sim$100 years ago, some of the historical supernovae might allow us to compactify the ETI survey regions down to less than one present of $4π$, around two rings in the sky.
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