外星文明发展通讯技术的比例上限
Upper limit on the fraction of alien civilizations that develop communication technology
摘要：
我们重新审视了外星文明发展通信技术的可能性，其基础是其他地方的生命可能具有非碳化学基础的一般假设。我们特别讨论了氮溶剂中复杂的硅基生物化学，并详细说明了这种化学可行的环境，如果是这样，在什么尺度上。更具体地说，我们确定了宜居带以外的区域，这些生物可以生长和繁荣，之后，我们研究我们的研究结果如何影响最近得出的上限的一部分，生活的智能物种，发展通信技术$\langle ξ_{\rm biotec} \rangle$。我们还比较了这种新的限制$\langle ξ_{\rm biotec} \rangle$与扩展的宜居带，以适应地下外生命，起源于行星与地下（水）海洋。
英文摘要：
We re-examine the likelihood for alien civilizations to develop communication technology on the basis of the general assumption that life elsewhere could have a non-carbon chemical foundation. We particularized the discussion to a complex silicon-based biochemistry in a nitrogen solvent, and elaborate on the environment in which such a chemistry is feasible, and if so, on what scales. More concretely, we determine the region outside the habitable zone where such organisms can grow and flourish and after that we study how our findings impact the recently derived upper limit on the fraction of living intelligent species that develop communication technology $\langle ξ_{\rm biotec} \rangle$. We also compare this new restriction on $\langle ξ_{\rm biotec} \rangle$ with that resulting from the extension of the habitable zone to accommodate subsurface exolife, originating in planets with subsurface (water) oceans.
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