  Radiative heat transfer between two far-field-separated nanoparticles placed
close to a perfectly conducting nanowire decays logarithmically slow with the
interparticle distance. This makes a cylinder an excellent waveguide which can
transfer thermal electromagnetic energy to arbitrary large distances with
almost no loss. It leads to a dramatic increase of the heat transfer, so that,
for almost any (large) separation, the transferred energy can be as large as
for isolated particles separated by a few hundred nanometers. A
phenomenologically found analytical formula accurately describes the numerical
results over a wide range of parameters.
