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<Jerry A. Sellwood> studies the <dynamics> of <galactic disks>, including the origin and evolution of <spiral density waves>. His review with <Karen L. Masters> compares observations, dynamical theory and simulations of recurring spiral patterns.

The review emphasizes a physical feedback: transient spiral activity increases random stellar <motion>, which can make further spiral activity harder to sustain. A dissipative <gas> component can alter that evolution. This connects the visible shape of a <spiral galaxy> to the changing dynamical state of its <stars> and <gas>, rather than treating the arms as a permanently fixed decoration.<Spirals in Galaxies by Jerry A. Sellwood and Karen L. Masters>[Abstract: self-excited patterns, random motion and the role of dissipative gas]{ref}

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 Jerry A. Sellwood (source code)