Summary
In this paper the coefficients of the diffusion equation for a unidimensional mechanical system are calculated up toO(1/β7), in terms of the frictional constant β. This procedure is a variant of the one used previously, which is based on splitting the velocity into a deterministic plus a rapidly fluctuating part. This splitting was adjusted so as to make the memory integral, which appears in the expression for the diffusion coefficient, vanish. Consequently, the deterministic part of the velocity results to satisfy a modified Hamilton-Jacobi dissipative equation in configuration space. Here, a new expansion of the response function is introduced, so as to make calculations more expeditious.
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Battezzati, M. The expansion of the configurational diffusion equation in inverse powers of the frictional constant: Further progress in the calculation of coefficients by functional integral methods. Nuov Cim B 110, 1287–1306 (1995). https://doi.org/10.1007/BF02723113
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DOI: https://doi.org/10.1007/BF02723113