Bosonic-Seesaw Portal Dark Matter
  We discuss a new type of Higgs-portal dark matter (DM)-production mechanism,
called bosonic-seesaw portal (BSP) scenario. The BS provides the dynamical
origin of the electroweak symmetry breaking, triggered by mixing between the
elementary Higgs and a composite Higgs generated by a new-color strong
dynamics, hypercolor (HC). At the HC strong coupling scale, the classical-scale
invariance assumed in the model is dynamically broken as well as the "chiral"
symmetry present in the HC sector. In addition to the composite Higgs, HC
baryons emerge to potentially be stable because of the unbroken HC baryon
number symmetry. Hence the lightest HC baryon can be a DM candidate. Of
interest in the present scenario is that HC pions can be as heavy as the HC
baryon due to the possibly enhanced-explicit "chiral"-breaking effect triggered
after the BS mechanism, so the HC baryon pair cannot annihilate into HC pions.
As in the standard setup of freeze-in scenario, it is assumed that the DM was
never in the thermal equilibrium, which ends up with no thermal abundance. It
is then the non-thermal BSP process that crucially comes into the game below
the HC scale: the HC baryon significantly couples to the standard-model Higgs
via the BS mechanism, and can non-thermally be produced from the thermal plasma
below the HC scale, which turns out to allow the TeV mass scale for the
composite baryonic DM, much smaller than the generic bound placed in the
conventional thermal freeze-out scenario, to account for the observed relic
abundance. Thus the DM can closely be related to the mechanism of the
electroweak symmetry breaking.
