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- W2003253334 abstract "This paper considers the collisional relaxation of an electrostatic plasma and a gravitationally interacting system in the context of a homogeneous expanding universe. For an electrostatic plasma, one anticipates, in the absence of an expansion, a relaxation towards a Maxwellian distribution of velocities on a time scale ${t}_{R}$. If, however, one allows for an expansion, working in the average comoving frame, one anticipates instead deviations from a Maxwellian distribution. Provided that the Debye time scale ${t}_{D}$ is small compared with the expansion time ${t}_{E}$, one anticipates that these deviations will be manifest on a time scale ${t}_{S}ensuremath{sim}(frac{{t}_{E}}{{t}_{D}}) mathrm{ln} (frac{{t}_{D}}{{t}_{C}}){t}_{R}ensuremath{gg}{t}_{R}$, where ${t}_{C}ensuremath{ll}{t}_{D}$ is the characteristic time scale associated with close encounters, in which a linear-trajectory approximation fails. For the case of gravitational interactions, which are themselves responsible for the overall expansion, there again exist time scales ${t}_{S}$ and ${t}_{R}$. In this case, however, ${t}_{S}ensuremath{sim}mathrm{ln}(frac{{t}_{*}}{{t}_{C}}){t}_{R}$, where ${t}_{*}ensuremath{equiv}mathrm{min}({t}_{E},{t}_{R})$." @default.
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- W2003253334 date "1984-11-15" @default.
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- W2003253334 title "Role of Maxwellian distribution in an expanding universe" @default.
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- W2003253334 doi "https://doi.org/10.1103/physrevd.30.2067" @default.
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