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arXiv 2403.09282math.AP
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活性粒子非局部平流-扩散模型的正则性与平衡态趋近

Regularity and trend to equilibrium for a non-local advection-diffusion model of active particles

Luca Alasio, Jessica Guerand, Simon Schulz

AI总结:

本研究针对活性粒子非局部平流-扩散模型,证明了弱解的正则性与瞬时光滑化,并在漂移项小性假设下建立了向稳态的收敛性。

摘要:

我们建立了具有非线性非局部漂移项的抛物型方程弱解的正则性,并在适当假设下证明了其向稳态的收敛性;该方程源自先前工作中对具有排斥相互作用的活性布朗粒子的建模,该模型在粒子位置和取向两个维度上均包含了平流-扩散过程。我们应用De Giorgi方法,并对方程关于时间变量进行迭代求导,以证明弱解在初始时刻之后变得光滑。这一策略要求我们获得改进的可积性估计,以处理非局部漂移项的存在。弱解所观察到的瞬时光滑化效应也被证明对于由分布型初始数据产生的极弱解同样成立;该结果的证明依赖于一个针对低正则性解的M. Pierre风格唯一性定理。在漂移项满足小性假设的条件下,我们证明了向稳态的收敛性。

英文摘要:

We establish regularity and, under suitable assumptions, convergence to stationary states for weak solutions of a parabolic equation with a non-linear non-local drift term; this equation was derived from a model of active Brownian particles with repulsive interactions in a previous work, which incorporates advection-diffusion processes both in particle position and orientation. We apply De Giorgi's method and differentiate the equation with respect to the time variable iteratively to show that weak solutions become smooth away from the initial time. This strategy requires that we obtain improved integrability estimates in order to cater for the presence of the non-local drift. The instantaneous smoothing effect observed for weak solutions is shown to also hold for very weak solutions arising from distributional initial data; the proof of this result relies on a uniqueness theorem in the style of M.~Pierre for low-regularity solutions. The convergence to stationary states is proved under a smallness assumption on the drift term.

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