The possible existence of axion-like particles could lead to a new type of long distance communication. In this work, basic antenna concepts are defined and a Friis-like equation is derived to facilitate long-distance link calculations. An example calculation is presented showing that communication over distances of 1000 km or more may be possible for $m_{ a}< 3.5$ meV and $g_{ a\gamma \gamma} > 5 \times 10^{ - 8} { \text{ GeV}}^{ - 1}$.
Categories: hep-ph astro-ph hep-th