Collision rates in nearly Keplerian or harmonic stellar potentials match the standard nSigma v estimate in most astrophysical environments, with order-of-magnitude exceptions near intermediate-mass black holes and for the largest debris-disk planetesimals.
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The unreasonable effectiveness of the $n \Sigma v$ approximation
Collision rates in nearly Keplerian or harmonic stellar potentials match the standard nSigma v estimate in most astrophysical environments, with order-of-magnitude exceptions near intermediate-mass black holes and for the largest debris-disk planetesimals.