  We study the production of ultra-light dark photons from a network of
near-global, Abelian-Higgs cosmic strings. We find that dark photons produced
in this way are nonrelativistic today and can make up all of the dark matter
for dark photon masses as small as $m_A \sim 10^{-22} \, \mathrm{eV}$.

High Energy Physics - Phenomenology