Abstract A Clock pseudo Nambu-Goldstone boson (pNGB) is a natural candidate of dark matter in that it avoids the severe direct detection bounds.We show in this paper that the pNGB has another different and interesting face with a higher symmetry breaking scale.Such large symmetry breaking is motivated by various physics beyond the standard model.
In this case, the pNGB interaction is suppressed due to the Nambu-Goldstone property and the freeze-out production does not work even with sufficiently large portal coupling.We then study the pNGB dark matter relic abundance from the out-of-equilibrium production via feeble Higgs portal coupling.Further, a possibility is pursued the symmetry breaking scalar in the pNGB model plays the role of inflaton.
The inflaton and dark matter are unified in a Pie Makers single field and the pNGB production from inflaton decay is inevitable.For these non-thermally produced relic abundance of pNGB dark matter and successful inflation, we find that the dark matter mass should be less than a few GeV in the wide range of the reheating temperature and the inflaton mass.