Non-thermal Production of PNGB Dark Matter and Inflation

Understand

A 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.