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Springer eBooks

The Decay Process: An Exactly Soluble Example and its Implications

Gastón García‐Calderón, G. Loyola, M. Moshińsky

Published Jan 1, 1992• 10 citations
Publisher
DOI
10.1007/978-3-642-77284-9_18

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In this paper it is shown that several cases of one-dimensional N-body problems are exactly soluble. The first case describes the motion of three one-dimensional particles of arbitrary mass which interact with one another via infinite-strength, repulsive delta-function potentials. It is found in this case that the stationary-state solution of the scattering of the three particles is analogous to an electro-magnetic diffraction problem which has already been solved. The solution to this analogous electro-magnetic problem is interpreted in terms of particles. Next it is shown that the problem of three particles of equal mass interacting with each other via finite- but equal-strength delta-function potentials is exactly soluble. This example exhibits rearrangement and bound-state effects, but no inelastic processes occur. Finally it is shown that the problem of N particles of equal mass all interacting with one another via finite- but equal-strength delta functions is exactly soluble. Again no inelastic processes occur, but various types of rearrangements and an N-particle bound state do occur. These rearrangements and the N-particle bound state are illustrated by means of a series of sample calculations.
We study the nonequilibrium dynamics of one-dimensional adsorption-desorption processes with diffusional relaxation. According to the relative values of the transition probability rates, these systems can be mapped onto a soluble problem of many fermions. The time development of pair correlations, interparticle distribution functions, macroscopic density, structure factor, and density fluctuations is obtained by combining and comparing both exact results with Monte Carlo simulations. Depending on the spectrum gap of the evolution operator associated with the stochastic dynamics, these quantities display either exponential decay or power-law relaxation. For vanishing gaps, the pair correlations exhibit a faster decay as opposed to the standard diffusive relaxation of the macroscopic density. (c) 1995 The American Physical Society