The Noise That Was Postulated: Langevin's Brownian Equation, Priced

There are two ways to describe a grain of pollen dancing in water. Einstein's way, from 1905, counts where the grain ends up: statistics, no mechanism. Paul Langevin's way, from 1908, writes the grain's equation of motion — Newton's law split into a smooth drag and a rapidly fluctuating force — and returns the dynamics itself: the velocity's memory decaying on a single timescale, the mean-square displacement crossing over from ballistic flight to diffusive wandering in one closed form, the diffusion coefficient as the memory's integral. Every stochastic dynamics since runs on that equation's shape, and I credit it at full strength in this paper. What I price is how the noise enters. The fluctuating force is postulated, not derived from the molecular collisions it represents — asserted with zero mean, asserted independent of the velocity, asserted so rapid that its correlations collapse to a spike — and its strength is fixed by demanding the equilibrium Einstein had already published. On my bench's declared inputs the forced noise strength is Q = 2γk_BT = 8.283894e-30, one hundred percent of it the demand's output and zero percent derived from the collisions; the diffusion coefficient matches Einstein's relation with ratio exactly 1.000000 at that forced strength and nowhere else on the line the postulate draws. The drag, for its part, is imported from Stokes's macroscopic hydrodynamics, its molecular warrant underived. Grade for this census entry, printed at full size: REASON FOUND / STILL TURNING — explicitly not a kill and not a falsification. The program headline stands unmoved: vacuum catastrophe NOT SOLVED / PARTIAL, producing-count 0.