Interfaces and coarsening in chiral active matter*

Chirality is ubiquitous in the living world. We study ordering and phase separation in chiral active matter in the framework of pseudo-scalar active field theories. For the two-dimensional case we then extract the 1+1-dimensional dynamical equation for the height field of an interface. Our predictions include unidirectional interface waves -- a hallmark of parity breaking. We elucidate active chiral effects on coarsening and on instabilities of strips, derive the coarse-grained equation from a microscopic model, and investigate forces and torques between inclusions in a chiral active medium.