By Edward Nelson

These notes are in response to a process lectures given by means of Professor Nelson at Princeton throughout the spring time period of 1966. the topic of Brownian movement has lengthy been of curiosity in mathematical likelihood. In those lectures, Professor Nelson lines the historical past of prior paintings in Brownian movement, either the mathematical thought, and the normal phenomenon with its actual interpretations. He maintains via contemporary dynamical theories of Brownian movement, and concludes with a dialogue of the relevance of those theories to quantum box conception and quantum statistical mechanics.

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Fig. 2a is the highly overdamped case, a Markov process. Fig. 2b is the underdamped case, not a Markov process. Fig. 2c illustrates a case that does not occur. ) One has the feeling with some of Kappler’s curves that one can occasionally see where an exceptionally energetic gas molecule gave the mirror a kick. This is not true. Even at the lowest pressure used, an enormous number of collisions takes place per period, and the irregularities in the curves are due to chance fluctuations in the sum of enormous numbers of individually negligible events.

1) of the Ornstein-Uhlenbeck theory. Let w be a Wiener process with diffusion coefficient D (variance parameter 2D) as in the Einstein-Smoluchowski theory. Then if we set B = βw the process B has the correct variance parameter 2β 2 D for the OrnsteinUhlenbeck theory. The idea of the Smoluchowski approximation is that the relaxation time β −1 is negligibly small but that the diffusion coefficient D = kT /mβ and the velocity K/β are of significant size. 1) as β → ∞ with b and D fixed. 1) become dx(t) = v(t)dt dv(t) = −βv(t)dt + βb x(t), t dt + βdw(t).

In statistical mechanics the Gaussian distribution is called “Maxwellian”. Another name for it is “normal”. A Gaussian measure on ❘ is a measure that is the transform of the measure with density 1 1 2 e− 2 |x| /2 (2π) under an affine transformation. It is called singular in case the affine transformation is singular, which is the case if and only if it is singular with respect to Lebesgue measure. A set of random variables is called Gaussian in case the distribution of each finite subset is Gaussian.