A heteroclinic orbit connecting traveling waves pertaining to different nonlinearities

关于半线性wave equation全局能控性的一个注记

A note on the global controllability of the semilinear wave equation

研究了半线性波动方程$$v_{tt}(x,t)-Δv(x,t) + f(x,v(x,t))= \Un_ω u(x,t)$$的内能控性，其中非线性项$f$能产生多个非平凡的定态.得到全局能控性的一个常用假设是假设$f(x,v)v\geq 0$。在这种情况下，稳定化项$u=γ(x)v_t$使任何解收敛到零。全局可控性，然后遵循一个定理的局部可控性和时间可逆的方程。本文将非线性项$f$推广到更一般的情形，使得阻尼方程的解可以收敛到另一个平衡点而不是$0$ .为了证明全局可控性，我们研究了紧吸引子内部的可控性，并证明了利用异宿轨道从一个平衡点到另一个平衡点是可能的。

Criteria for the (in)stability of planar interfaces in singularly perturbed 2-component reaction-diffusion equations

We consider a class of singularly perturbed 2-component reaction-diffusion equations which admit bistable traveling front solutions, manifesting as sharp, slow-fast-slow, interfaces between stable homogeneous rest states. In many example systems, such as models of desertification fronts in dryland ecosystems, such fronts can exhibit an instability by which the interface destabilizes into fingering patterns. Motivated by the appearance of such patterns, we propose two versions of a 2D stability criterion for (transversal) long wavelength perturbations along the interface of these traveling slow…