A new multi-component stability parameter Q_delta = 5/3 maps disc swing amplification more consistently than older Q definitions and requires gas Q to be rescaled close to Q^(5/3).
@doi [ ] 10.1086/165880, https://ui.adsabs.harvard.edu/abs/1988ApJ...324...60B 324
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Redefining $Q$ for multi-component discs of stars and gas
A new multi-component stability parameter Q_delta = 5/3 maps disc swing amplification more consistently than older Q definitions and requires gas Q to be rescaled close to Q^(5/3).