Collective dynamics of dense disordered polar active matter

Considering only leading interactions, as excluded volume effects and a minimal alignment rule, we show that polar order displays the typical features of second-order phase transitions in a two-dimensional disordered active system. Besides causing collective motion, the alignment interaction drives the fluidification of the active glass and the dynamical slowing down of the polar phase. Finally, we observe that the polar order destroys active phase separation, producing homogeneous, disordered moving configurations