$\Psi$DM and the Bullet Cluster: Couple Inflaton to Higgs Field
  Electroweak theory is extended to $SU_L(2)\times U_Y(1)\times U_{\phi}(1)$, where $U_{\phi}(1)$ comes from the coupling of inflaton field to Higgs field. There arises an extremely light boson, $Y_{\mu}$. We resemble it as the wavelike dark matter, $\Psi$DM, through the dynamical analysis. The interactions of $Y_{\mu}$ may provide an explanation for the Bullet Cluster observations. Besides, a possible mechanism to produce $Y_{\mu}$ is discussed. 
Chia-Li Hsieh
hep-ph