The interpretation for Galactic Center Excess and Electroweak Phase Transition in the NMSSM

Understand

The gamma-ray excess observed by the Fermi-LAT in the Galactic Center can be interpreted by the dark matter annihilation to $b\bar{b}$ via a light pseudoscalar in the NMSSM.

• It is interesting to note that the corresponding singlet scalar is useful to achieve a strongly first order phase transition required by the electroweak baryogenesis.
• In this paper, we investigate the possibility that the NMSSM model can simultaneously accommodate these two issues.
• The phase transition strength can be characterized by the vacua energy gap at zero temperature and be sufficiently enhanced by the tree-level effect in the NMSSM.