  A possible connection between the cosmological baryon asymmetry, dark matter
and vector-like fermions is investigated. In this scenario an asymmetry
generated through baryogenesis or leptogenesis (in the vector-like matter
sector) connects the baryon asymmetry to the dark matter density. We present
explicit renormalizable models where this connection occurs. These models have
asymmetric dark matter and a significant invisible Higgs decay width to dark
matter particles is possible. We refer to this type of scenario as the
vector-like portal. In some asymmetric dark matter models there are potential
naturalness issues for the low energy effective theory. We address that issue
in the models we consider by starting with a Lagrangian that is the most
general renormalizable one consistent with the gauge (and discrete) symmetries
and showing the low energy effective theory automatically has the required form
as a consequence of the symmetries of the full theory. We show that the mass of
the dark matter candidate is predicted in these scenarios.
