Non-thermal Higgsino Dark Matter: Cosmological Motivations and
  Implications for a 125 GeV Higgs
  If the lightest supersymmetric particle (LSP) is Higgsino-like, the thermal
relic density is lower than the observed dark matter content for a LSP mass in
the sub-TeV region. We outline constraints arising from the Fermi Gamma-Ray
Telescope data and LSP production from gravitino decay that must be satisfied
by a successful non-thermal Higgsino scenario. We show that in a generic class
of models where anomaly and modulus mediated contributions to supersymmetry
breaking are of comparable size, Higgsino arises as the only viable sub-TeV
dark matter candidate if gravitinos are heavy enough to decay before the onset
of big bang nucleosynthesis (BBN). The correct relic density can be obtained
via modulus decay in these models. As an explicit example, we consider a
modulus sector in effective field theory ($D=4, N=1$ supergravitiy arising from
type IIB KKLT compactification). Within this class of mirage mediation models,
heaviness of the gravitino forces a sub-TeV Higgsino LSP and gives a Higgs mass
around 125 GeV. In this example, the constraints from direct detection
experiments are also satisfied.
