  By extending the scalar sector of the Standard Model (SM) by a U(1) singlet,
we show that the electroweak symmetry breaking enables the formation of a
stable, electrically neutral, colorless Q-ball which couples to the SM particle
spectrum solely through the Higgs boson. This Q-ball has mainly weak and
gravitational interactions, and behaves as a collection of weakly interacting
massive particles. Therefore, it can be a candidate for the dark matter in the
universe.
