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Expansion into the vacuum of stochastic gases with long-range interactions

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arxiv 2412.14875 v2 pith:GA6FUJNY submitted 2024-12-19 cond-mat.stat-mech math-phmath.MP

classification cond-mat.stat-mechmath-phmath.MP
keywords expansiongasesinteractionsparticlesbrowniancasecausedconcentrated
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abstract

We study the evolution of a system of many point particles initially concentrated in a small region in $d$ dimensions. Particles undergo overdamped motion caused by pairwise interactions through the long-ranged repulsive $r^{-s}$ potential; each particle is also subject to Brownian noise. When $s<d$, the expansion is governed by non-local hydrodynamic equations. In the one-dimensional case, we deduce self-similar solutions for all $s\in (-2,1)$. The expansion of Coulomb gases remains well-defined in the infinite-particle limit: The density is spatially uniform and inversely proportional to time independent of the spatial dimension.

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Cited by 1 Pith paper

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  1. Dynamical Spreading and Memory Retention Under Power Law Potential

    cond-mat.soft 2025-02 conditional novelty 6.0 of 10

    Overdamped repulsive power-law particles spread self-similarly with radius growing as t^{1/(k+2)}, and for k<d-2 the system retains a long-lived memory of its initial pattern.

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