Non-thermal Dark Matter in String Compactifications
  Non-thermal cosmological histories are capable of greatly increasing the
available parameter space of different particle physics dark matter (DM) models
and are well-motivated by the ubiquity of late-decaying gravitationally coupled
scalars in UV theories like string theory. A non-thermal DM model is presented
in the context of LARGE Volume Scenarios in type IIB string theory. The model
is capable of addressing both the moduli-induced gravitino problem as well as
the problem of overproduction of axionic dark radiation and/or DM. We show that
the right abundance of neutralino DM can be obtained in both thermal under and
overproduction cases for DM masses between O(GeV) to O(TeV). In the latter case
the contribution of the QCD axion to the relic density is totally negligible,
while in the former case it can be comparable to that of the neutralino thus
resulting in a multi-component DM scenario.
