Spiral structure as a recurrent instability

A long-standing controversy in studies of spiral structure has concerned th e lifetimes of individual spiral patterns. Much theoretical work has sought quasi-stationary spiral modes while N-body simulations have consistently d isplayed recurrent, short-lived patterns. The simulations manifest a recurr ent cycle of true instabilities related to small-scale features in the angu lar momentum distribution of particles, with the decay of each instability seeding the growth of the next. Data from the recent Hipparcos mission seem to offer support for the recurrent transient picture.