一般FPU型链的作用极小化前沿
Action minimizing fronts in general FPU-type chains
摘要:
我们研究了具有非线性近邻相互作用的原子链,证明了波前(具有常数渐近态的异宿行波)的存在性。推广最近的结果Herrmann和Rademacher,我们允许非凸的相互作用势和非单调的配置文件找到前线。这些前线最小化的作用积分,只有当渐近状态满足宏观约束,如果相互作用势满足几何图形条件,才能存在。最后,我们通过数值模拟来说明我们的发现。
英文摘要:
We study atomic chains with nonlinear nearest neighbour interactions and prove the existence of fronts (heteroclinic travelling waves with constant asymptotic states). Generalizing recent results of Herrmann and Rademacher we allow for non-convex interaction potentials and find fronts with non-monotone profile. These fronts minimize an action integral and can only exists if the asymptotic states fulfil the macroscopic constraints and if the interaction potential satisfies a geometric graph condition. Finally, we illustrate our findings by numerical simulations.
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