CP Violation in Dual Dark Matter
  In this paper we study the consequences of extending dual symmetry (DuSy) to include a generic $C_\mu$ vector field as a dual partner of the photon $A_\mu$. A new combined field, the complex $Z^\prime_\mu$, is obtained from $C_\mu$ and $A_\mu$. The promotion of dual symmetry to a local symmetry for $Z^\prime_\mu$ implies in the inclusion of an extra complex vector field $W_\mu$ with a complex gauge transformation. A dual dark matter (DM) Lagrangian ${\cal L}_{\rm DDM}$ is obtained from the general DuSy invariant Lagrangian ${\cal L}_{\rm DuSy}$. Our tentative conjecture is to interpret $W_\mu$ as the actual weak interaction charged gauge boson $W^{\pm}_\mu$, which leads us to speculate about a possible extra CP violation scenarios for future calculations. 
C. A. Z. Vasconcellos, D. Hadjimichef
hep-ph