Chandrasekhar Dynamical Friction
A perturber moves through a Maxwellian background of test particles. Gravitational focusing builds an overdense wake behind it; the back-reaction is Chandrasekhar dynamical friction, $a_{fric} \propto \rho \ln(\Lambda) f(X)$ with $X = V / (\sqrt{2}\sigma)$. The perturber visibly decelerates.
WHAT TO TRY
- Vary each control and watch the rail readouts respond.
- Compare the diagnostic plot against the live scene.