Calculations of the stopping power of a medium lead to divergent integrals in gravitational theory as they do in the analogous electromagnetic problem. In the latter case, one usually introduces the Debye length as a cutoff at large distances to remove the divergence. The question of what to do in the Newtonian gravitational analogue can be answered by including the self-gravity of the medium. Then the Jeans length appears naturally as a cutoff. Despite the different sign of the coupling constant from the case of the electric plasma, the same sort of theory works in both cases and removes the need of introducing ad hoc cutoffs from both of them.
KeywordsImpact Parameter Debye Length Cosmological Term Gravitational Instability Fourier Inversion
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