Including speculative silicon-based life in nitrogen lakes can tighten the upper limit on the fraction of intelligent species that develop communication technology by up to a factor of six.
A joint analysis of the Drake equation and the Fermi paradox
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abstract
I propose a unified framework for a joint analysis of the Drake equation and the Fermi paradox, which enables a simultaneous, quantitative study of both of them. The analysis is based on a simplified form of the Drake equation and on a fairly simple scheme for the colonization of the Milky Way. It appears that for sufficiently long-lived civilizations, colonization of the Galaxy is the only reasonable option to gain knowledge about other life forms. This argument allows one to define a region in the parameter space of the Drake equation where the Fermi paradox definitely holds (Strong Fermi paradox).
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Upper limit on the fraction of alien civilizations that develop communication technology
Including speculative silicon-based life in nitrogen lakes can tighten the upper limit on the fraction of intelligent species that develop communication technology by up to a factor of six.