 Bogomol'nyi–Prasad–Sommerfield bound

The Bogomol'nyi–Prasad–Sommerfield (BPS) bound is a concept in theoretical physics, particularly in the context of supersymmetry and solitons in field theories. It refers to a bound on the mass of certain solitonic solutions (like monopoles or other topological defects) in terms of their charge and other physical parameters.