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arXiv 1709.00737math.AP
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奇异摄动有限维梯度流的时滞失稳

Delayed loss of stability in singularly perturbed finite-dimensional gradient flows

Giovanni Scilla, Francesco Solombrino

摘要:

本文研究了有限维希尔伯特空间中梯度流的奇异消失粘性极限,主要讨论了定态解的延迟失稳问题.我们找到了一类含时的能量泛函和初始条件,我们可以明确地计算第一个不连续时间的极限$t^*$。对于我们的泛函类,$t^*$与线性化系统的解在平衡点附近的爆破时间一致,并且特别严格地大于关于驱动能量的严格局部极小值丢失的时间$t_c$。此外,我们表明,在右邻域的$t^*$,重标度的解决方案的奇摄动问题收敛到异宿解的梯度流。我们的结果补充了以前的Zanini,在那里我们考虑的情况被排除在假设所谓的横截性条件,和极限演化包括严格的本地极小的能量可忽略不计的一组时间。

英文摘要:

In this paper we study the singular vanishing-viscosity limit of a gradient flow in a finite dimensional Hilbert space, focusing on the so-called delayed loss of stability of stationary solutions. We find a class of time-dependent energy functionals and initial conditions for which we can explicitly calculate the first discontinuity time $t^*$ of the limit. For our class of functionals, $t^*$ coincides with the blow-up time of the solutions of the linearized system around the equilibrium, and is in particular strictly greater than the time $t_c$ where strict local minimality with respect to the driving energy gets lost. Moreover, we show that, in a right neighborhood of $t^*$, rescaled solutions of the singularly perturbed problem converge to heteroclinic solutions of the gradient flow. Our results complement the previous ones by Zanini, where the situation we consider was excluded by assuming the so-called transversality conditions, and the limit evolution consisted of strict local minimizers of the energy up to a negligible set of times.

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