Quasinormal modes (QNM) are the solutions of a source-free (usually partial) differential equation describing a dynamical system which does not conserve energy; this can happen if the system incorporates absorbing elements or allows for energy leakage. As such, they differ from normal modes in that the natural frequencies or resonant frequencies characteristic of these solutions are complex, exhibiting a decay of their amplitude in time.
Quasinormal modes (QNM) are the solutions of a source-free (usually partial) differential equation describing a dynamical system which does not conserve energy; this can happen if the system incorporates absorbing elements or allows for energy leakage. As such, they differ from normal modes in that the natural frequencies or resonant frequencies characteristic of these solutions are complex, exhibiting a decay of their amplitude in time.
Source: Wikipedia "Quasinormal mode" · CC BY-SA 4.0
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