%A Bing Zhang %T A quantitative assessment of communicating extra-terrestrial intelligent civilizations in the galaxy and the case of FRB-like signals %0 Journal Article %D 2020 %J Front. Phys. %J Frontiers of Physics %@ 2095-0462 %R 10.1007/s11467-020-0973-5 %P 54502-${article.jieShuYe} %V 15 %N 5 %U {https://journal.hep.com.cn/fop/EN/10.1007/s11467-020-0973-5 %8 2020-10-15 %X

A formula is proposed to quantitatively estimate the signal emission rate of Communicating Extra-Terrestrial Intelligent civilizations (CETIs) in the Galaxy. I suggest that one possible type of CETI signal would be brief radio bursts similar to fast radio bursts (FRBs). A dedicated search for FRB–like artificial signals in the Galaxy for decades may pose a meaningful upper limit on the emission rate of these signals by CETIs. The Fermi-Hart paradox is answered in terms of not having enough observing times for this and other types of signals. Whether humans should send FRB-like signals in the far future is briefly discussed.