Broadcasting but not receiving: density dependence considerations for SETI signals

Details Broadcasting but not receiving: density dependence considerations for SETI signals Broadcasting but not receiving: density dependence considerations for SETI signals

2009-01-24

arxiv.org/abs/0901.3863v3

International Journal of Astrobiology, volume 8, issue 02, pp. 101-105 (2009)

Physics

General Physics

11 pages, 2 figures; note revised 2/6/2010 to correct minor mathematical errors. The conclusions and final numbers of the pape

Scientific paper

10.1017/S1473550409990097

This paper develops a detailed quantitative model which uses the Drake equation and an assumption of an average maximum radio broadcasting distance by an communicative civilization to derive a minimum civilization density for contact between two civilizations to be probable in a given volume of space under certain conditions, the amount of time it would take for a first contact, and whether reciprocal contact is possible. Results show that under certain assumptions, a galaxy can be teeming with civilizations yet not have a guarantee of communication between any of them given either short lifetimes or small maximum distances for communication.

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