Very Light Asymmetric Dark Matter
  Very light dark matter is usually taken to consist of uncharged bosons such
as axion-like particles or dark photons. Here, we consider the prospect of very
light, possibly even sub-eV dark matter carrying a net charge that is
(approximately) conserved. By making use of the Affleck-Dine mechanism for its
production, we show that a sizable fraction of the energy density can be stored
in the asymmetric component. We furthermore argue that there exist regions of
parameter space where the energy density contained in symmetric
particle-antiparticle pairs without net charge can to some degree be depleted
by considering couplings to additional fields. Finally, we make an initial
foray into the phenomenology of this scenario by considering the possibility
that dark matter is coupled to the visible sector via the Higgs portal.
