A Newtonian self-gravitating polytropic fluid in this configuration is the subject of the Lane-Emden equation.
The collapse of a wavefunction of this type into linear tracks in a cloud chamber is the subject of the Mott problem. A model of ferromagnets with this configuration can be solved exactly in the presence of an external field and has critical exponents independent of geometry when the dimension is greater than four; that model is sometimes named for Berlin and Kac. When using the WKB approximation on a system with this configuration, a constant of one-fourth is added to L times L plus 1 terms; that trick is named for Langer. Any solution to the Einstein Field Equations with this configuration must be static and asymptotically flat according to (*) Birkhoff's theorem. A Newtonian self-gravitating polytropic fluid in this configuration is the subject of the Lane-Emden equation. A magnetized surface of this shape is the only one that doesn't produce non-dipole components, and the plane wave expansion expresses plane waves as sums of waves with this configuration. A Schmidt corrector is often used with mirrors with this shape, and a capacitor of this shape has capacitance equal to its radius. For 10 points, name this shape, which is also the shape of equipotential surfaces around an isolated point charge.
The collapse of a wavefunction of this type into linear tracks in a cloud chamber is the subject of the Mott problem.
spherical [or sphere or spherically symmetric or radially symmetric; prompt on “shell”]