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arXiv 2210.06162math.AP
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具有非局部相互作用的二阶两种群系统:存在性和大阻尼极限

Second order two-species systems with nonlocal interactions: existence and large damping limits

Marco Di Francesco, Simone Fagioli, Valeria Iorio

摘要:

我们研究的数学理论的二阶系统的两个物种,所产生的动力学相互作用的粒子受到线性阻尼,非局部力和外部的,并导致到一个非局部版本的可压缩的欧拉系统与线性阻尼。我们的结果是有限的$1$空间维的情况下,但允许初始数据中采取的Wasserstein空间的概率测度。我们首先考虑光滑的非局部相互作用势的情况下,不受任何对称性条件,并证明存在性和唯一性。解决方案的概念依赖于在碰撞的情况下的粘性条件,在文献中以前的作品的精神。结果使用的概念从经典的希尔伯特空间理论的梯度流(参见。[7]和[4]中使用的技巧。然后,我们考虑一个大的时间和大阻尼缩放版本,我们的系统和证明收敛到相应的一阶系统的解决方案。最后,我们考虑的情况下,牛顿位势-交叉相互作用势的对称性-和外部凸势。在[4]的精神下,在粘性粒子框架中证明了存在性之后,我们证明了两种密度的Dirac delta解的大时间收敛性。所有的结果共享一个共同的技术框架,在该解决方案被认为是在拉格朗日框架,它允许通过$L^2$估计的伪逆变量对应的两个密度估计的解决方案的行为。特别是,由于这种技术,大阻尼的结果保持在一个相当弱的条件下的初始数据,这不需要精心准备的初始速度。我们补充的结果与数值模拟。

英文摘要:

We study the mathematical theory of second order systems with two species, arising in the dynamics of interacting particles subject to linear damping, to nonlocal forces and to external ones, and resulting into a nonlocal version of the compressible Euler system with linear damping. Our results are limited to the $1$ space dimensional case but allow for initial data taken in a Wasserstein space of probability measures. We first consider the case of smooth nonlocal interaction potentials, not subject to any symmetry condition, and prove existence and uniqueness. The concept of solutions relies on a stickiness condition in case of collisions, in the spirit of previous works in the literature. The result uses concepts from classical Hilbert space theory of gradient flows (cf. Brezis [7]) and a trick used in [4]. We then consider a large-time and large-damping scaled version of our system and prove convergence to solutions to the corresponding first order system. Finally, we consider the case of Newtonian potentials -- subject to symmetry of the cross-interaction potentials -- and external convex potentials. After showing existence in the sticky particles framework in the spirit of [4], we prove convergence for large times towards Dirac delta solutions for the two densities. All the results share a common technical framework in that solutions are considered in a Lagrangian framework, which allows to estimate the behavior of solutions via $L^2$ estimates of the pseudo-inverse variables corresponding to the two densities. In particular, due to this technique, the large-damping result holds under a rather weak condition on the initial data, which does not require well-prepared initial velocities. We complement the results with numerical simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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