论文标题
对于具有综合非本地电位的等速度问题的大质量最小化器
Large mass minimizers for isoperimetric problems with integrable nonlocal potentials
论文作者
论文摘要
本文与原子核的Gamow液滴模型得出的体积约束最小化问题有关,涉及周边项和排斥性非本地电位的竞争。我们考虑了一般径向非负核给出的大量潜力,这些核可以在$ \ mathbb {r}^n $上集成,例如贝塞尔电位,并研究了大群众(即体积)问题的行为。与小质量案例相反,与周长相比,非局部术语可忽略不计,与之相比,非本地术语爆炸。但是,使用这些内核的集成性,我们将问题重写为经典周长和非局部周边之间的差异的最小化,后者会收敛到经典周围的倍数,因为质量是无限的。将固定体积重归于固定体积,我们表明,如果内核的第一刻小于明确的阈值,则该问题将使任意大质量的最小化剂量接收,这与通常的Riesz电位相反。此外,我们证明,随着质量变为无穷大,任何最小化器序列都会收敛到球。最后,我们研究球的稳定性,并表明我们在内核的第一时刻的阈值在大球从稳定到不稳定的意义上是锋利的。大球超过此阈值的直接后果是存在非平凡的紧凑型核,这些问题允许这些问题允许不是球的最小化器,也就是说,对称性破裂发生。
This paper is concerned with volume-constrained minimization problems derived from Gamow's liquid drop model for the atomic nucleus, involving the competition of a perimeter term and repulsive nonlocal potentials. We consider a large class of potentials, given by general radial nonnegative kernels which are integrable on $\mathbb{R}^n$, such as Bessel potentials, and study the behavior of the problem for large masses (i.e., volumes). Contrarily to the small mass case, where the nonlocal term becomes negligible compared to the perimeter, here the nonlocal term explodes compared to it. However, using the integrability of those kernels, we rewrite the problem as the minimization of the difference between the classical perimeter and a nonlocal perimeter, which converges to a multiple of the classical perimeter as the mass goes to infinity. Renormalizing to a fixed volume, we show that, if the first moment of the kernels is smaller than an explicit threshold, the problem admits minimizers of arbitrarily large mass, which contrasts with the usual case of Riesz potentials. In addition, we prove that, any sequence of minimizers converges to the ball as the mass goes to infinity. Finally, we study the stability of the ball, and show that our threshold on the first moment of the kernels is sharp in the sense that large balls go from stable to unstable. A direct consequence of the instability of large balls above this threshold is that there exist nontrivial compactly supported kernels for which the problems admit minimizers which are not balls, that is, symmetry breaking occurs.