Today’s Sunday Funny is funny mostly because of the title of the paper. It’s a perfectly serious paper about physics, but it’s got Sausages, and Kinks. And Jeans.
Phys Rev Lett. 2011 May 13;106(19):191103. Epub 2011 May 13.
Sausage and kink oscillations in astrophysical disk configurations.
Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel. email@example.com
The development of hydrodynamic oscillations in various rotating astrophysical disks ranging from planetary rings to galaxies is studied analytically. The dispersion relation of wave propagation is derived. Modes of oscillation are examined from this dispersion relation that are suitable for obtaining information not just on oscillations but also on some instability properties of the disk-shaped structure. It is shown that unstable oscillations of different types, sausage compression and kink bending, may be excited effectively due to the Jeans gravitational instability and the kink transverse instability, respectively. The obtained results for the sausage oscillations may be applicable for such phenomena as the appearance of the in-plane spiral and circular structures, while the case for the kink mode is more relevant for the systematic vertical corrugations of astrophysical disks.
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