Possibility of a coordinated signaling scheme in the Galaxy and SETI experiments

Abstract

We discuss a Galaxy-wide coordinated signaling scheme with which a SETI observer needs to examine a tiny fraction of the sky. The target sky direction is determined as a function of time, based on high-precision measurements of a progenitor of a conspicuous astronomical event such as a coalescence of a double neutron star binary. In various respects, such a coordinated scheme would be advantageous for both transmitters and receivers, and might be widely prevailing as a tacit adjustment. For this scheme, the planned space gravitational-wave detector LISA and its follow-on missions have a potential to narrow down the target sky area by a factor of $10^{3\text{-}4}$, and could have a large impact on future SETI experiments.

arXiv comment4 pages, 3 figures, accepted for publication in ApJL

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• Astrometric study of Gaia DR2 stars for interstellar communication