Confinement and multi-flux vortices in dual QCD

The screening effects in a chromodynamic vacuum which acts as a dual superconductor in the background of the magnetic condensation play crucial role in explaining the mechanism of quark confinement. Recently, the colour charge and colour electric flux screening mechanism is investigated in detail and these screening effects are shown to be responsible for the quark (colour) confinement in dual QCD. In this work, it is shown that in addition to such screening effects, there exist n-vortex solutions with Bogomol'nyi-Prasad-Sommerfeld (BPS) conditions with the transition from the type-II to type-I in dual QCD vacuum at strong coupling constant