Certain families of razor-thin disk surface densities based on beta distributions and relatives produce gravitational potentials equivalent to linear mass distributions, often via single quadratures or closed forms.
In other words, eitherΣ(R) is cusped forc≤1 orΣ(0) is constant forc>1, whereas3 2 c(R)→0 asR→0 ifc> 1 2
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Potentials of axisymmetric razor-thin disks
Certain families of razor-thin disk surface densities based on beta distributions and relatives produce gravitational potentials equivalent to linear mass distributions, often via single quadratures or closed forms.