Scalar Split WIMPs in the Future Direct Detection Experiments
  We consider a simple renormalizable dark matter model consisting of two real
scalars with a mass splitting $\delta$, interacting with the SM particles
through the Higgs portal. We find a viable parameter space respecting all the
bounds imposed by invisible Higgs decay experiments at the LHC, the direct
detection experiments by XENON100 and LUX and the dark matter relic abundance
provided by WMAP and Planck. Despite the singlet scalar dark matter model that
is fragile against the future direct detection experiments, the scalar split
model introduced here survives such forthcoming bounds. We emphasize on the
role of the co-annihilation processes and the mixing effects in this feature.
For $m_{\text{DM}} \sim 63$ GeV in this model we can explain as well the
observed gamma-ray excess in the analyses of the Fermi-LAT data at Galactic
latitudes $2^{\circ} \leq |b| \leq 20^{\circ}$ and Galactic longitudes $|l| <
20^{\circ}$.
