  Observations of diffuse Galactic gamma ray emission (DGE) by the Fermi Large
Area Telescope (LAT) allow a detailed study of cosmic rays and the interstellar
medium. However, diffuse emission models of the inner Galaxy underpredict the
Fermi-LAT data at energies above a few GeV and hint at possible
non-astrophysical sources including dark matter (DM) annihilations or decays.
We present a study of the possible emission components from DM using the
high-resolution Via Lactea II N-body simulation of a Milky Way-sized DM halo.
We generate full-sky maps of DM annihilation and decay signals that include
modeling of the adiabatic contraction of the host density profile, Sommerfeld
enhanced DM annihilations, $p$-wave annihilations, and decaying DM. We compare
our results with the DGE models produced by the Fermi-LAT team over different
sky regions, including the Galactic center, high Galactic latitudes, and the
Galactic anti-center. This work provides possible templates to fit the
observational data that includes the contribution of the subhalo population to
DM gamma-ray emission, with the significance depending on the
annihilation/decay channels and the Galactic regions being considered.
