What is stable disc assymmetry?

Stable disc asymmetry refers to a condition in which the distribution of mass in a celestial disc, such as a galaxy or a protoplanetary disc, is uneven or lopsided yet maintains a consistent configuration over time. This asymmetry can arise from various processes, including gravitational interactions, collisions, or the influence of nearby structures. Unlike transient asymmetries that change rapidly, stable disc asymmetry persists, affecting the dynamics and evolution of the disc system and potentially influencing star formation and the overall morphology of the galaxy or disc.