  In this work we investigate the possibility that a simple extension of the
Standard Model (SM) can be the dark matter of the universe. We postulate the
existence of a scalar field singlet like the Higgs as an extra term in the SM
Lagrangian. We find that from the astrophysical point of view a very small mass
and self-interaction is more convenient to agree with observations and from
particle detectors observations we do not see any essential constrain to this
settings. Thus, we conclude that a scalar field singlet with a small mass and
self-interaction is a good candidate to be the nature of the dark matter.
