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• W1971240108 abstract "To obtain further insight on possible power law generalizations of Boltzmann equilibrium concepts, a stochastic collision model is investigated. We consider the dynamics of a tracer particle of mass $M$, undergoing elastic collisions with ideal gas particles of mass $m$, in the Rayleigh limit $m<<M$. The probability density function (PDF) of the gas particle velocity is $f(tilde{v}_m)$. Assuming a uniform collision rate and molecular chaos, we obtain the equilibrium distribution for the velocity of the tracer particle $W_{eq}(V_M)$. Depending on asymptotic properties of $f(tilde{v}_m)$ we find that $W_{eq}(V_M)$ is either the Maxwell velocity distribution or a L'evy distribution. In particular our results yield a generalized Maxwell distribution based on L'evy statistics using two approaches. In the first a thermodynamic argument is used, imposing on the dynamics the condition that equilibrium properties of the heavy tracer particle be independent of the coupling $epsilon=m/M$ to the gas particles, similar to what is found for a Brownian particle in a fluid. This approach leads to a generalized temperature concept. In the second approach it is assumed that bath particles velocity PDF scales with an energy scale, i.e. the (nearly) ordinary temperature, as found in standard statistical mechanics. The two approaches yield different types of L'evy equilibrium which merge into a unique solution only for the Maxwell--Boltzmann case. Thus, relation between thermodynamics and statistical mechanics becomes non-trivial for the power law case. Finally, the relation of the kinetic model to fractional Fokker--Planck equations is discussed." @default.
• W1971240108 created "2016-06-24" @default.
• W1971240108 creator A5075146702 @default.
• W1971240108 date "2004-06-01" @default.
• W1971240108 modified "2023-10-16" @default.
• W1971240108 title "Stable Equilibrium Based on Lévy Statistics:A Linear Boltzmann Equation Approach" @default.
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• W1971240108 doi "https://doi.org/10.1023/b:joss.0000028068.93241.3a" @default.
• W1971240108 hasPublicationYear "2004" @default.
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