Abstract
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 $m_A \sim 10^{-22} \, \mathrm{eV}$.
Highlights
The evidence for a dark form of matter in the Universe is overwhelming, we still know next to nothing about its properties and interactions
This article discusses the production of dark photon dark matter from a network of cosmic strings
II, we present a simple model for a massive dark photon, we detail this model’s near-global cosmic string solution, and we discuss alternative models
Summary
The evidence for a dark form of matter in the Universe is overwhelming, we still know next to nothing about its properties and interactions. Producing the observed dark matter relic abundance in this way requires a dark photon mass of mA ≈ ð10−5 eVÞðHinf=1014 GeVÞ−4 [14], but since the inflationary Hubble scale is constrained to be Hinf ≲ 1014 GeV, this mechanism is inadequate for smaller dark photon masses. Another approach to the dark photon production problem involves first populating an auxiliary sector and transferring energy to the dark photon. This article discusses the production of dark photon dark matter from a network of cosmic strings.
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