Moduli Portal Dark Matter
  We show that moduli fields as mediators between the Standard Model and the
dark sector can naturally lead to the observed relic abundance. Indeed, even if
moduli are very massive, the nature of their couplings with matter and gauge
fields allows producing a sufficiently large amount of dark matter in the early
Universe through the freeze-in mechanism. Moreover, the complex nature of the
moduli fields whose real and imaginary part couple differently to the thermal
bath gives an interesting and unusual phenomenology compared to other freeze-in
models of that type.
