Collapsing domain walls beyond $Z_2$

Understand

Discrete symmetries are widely imposed in particle theories.

• It is well-known that the spontaneous breaking of discrete symmetries leads to domain walls.
• Current studies of domain walls have focused on those from the spontaneous breaking of a $Z_2$ symmetry.
• Larger discrete symmetries have multiple degenerate vacua, leading to the domain walls in principle different from the simplest $Z_2$ domain wall.