  In the absence of any hints of new physics in LHC, TeV dark matter candidates
interacting through electroweak force (EWDM) are still highly motivated. We
extend the Standard Model by adding an arbitrary SU(2) DM multiplet in
non-chiral representation. In addition to the well-known real representation
which has no coupling to the nuclei at tree level, the complex representation
can lead to a new DM candidate providing that one includes a higher dimensional
mass-splitting operator, which survives the current direct detection bounds.
Since the masses of gauge mediators are light compared to the dark particles,
Sommerfeld effect is dominant and affects the value of annihilation
cross-section in both the early universe and current time. We computed the
relic abundance through freeze-out mechanism in order to determine DM mass.
Gamma ray fluxes in our galaxy and dwarf satellites provide a promising tool to
probe EWDM theory. We confronted the four fermionic representations of the
model with the latest astrophysical observations. It can be concluded that the
model passes the current experimental constraints successfully, and it is
accessible to future observations.
