Phononic rogue waves

被引:14
|
作者
Charalampidis, E. G. [1 ]
Lee, J. [1 ]
Kevrekidis, P. G. [1 ]
Chong, C. [2 ]
机构
[1] Univ Massachusetts, Dept Math & Stat, Amherst, MA 01003 USA
[2] Bowdoin Coll, Dept Math, Brunswick, ME 04011 USA
基金
美国国家科学基金会;
关键词
NONLINEAR RESONANCES; PEREGRINE SOLITON; BREATHERS; LATTICES; MODES;
D O I
10.1103/PhysRevE.98.032903
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
We present a theoretical study of extreme events occurring in phononic lattices. In particular, we focus on the formation of rogue or freak waves, which are characterized by their localization in both spatial and temporal domains. We consider two examples. The first one is the prototypical nonlinear mass-spring system in the form of a homogeneous Fermi-Pasta-Ulam-Tsingou (FPUT) lattice with a polynomial potential. By deriving an approximation based on the nonlinear Schrodinger (NLS) equation, we are able to initialize the FPUT model using a suitably transformed Peregrine soliton solution of the NLS equation, obtaining dynamics that resembles a rogue wave on the FPUT lattice. We also show that Gaussian initial data can lead to dynamics featuring a rogue wave for sufficiently wide Gaussians. The second example is a diatomic granular crystal exhibiting rogue-wave-like dynamics, which we also obtain through an NLS reduction and numerical simulations. The granular crystal (a chain of particles that interact elastically) is a widely studied system that lends itself to experimental studies. This study serves to illustrate the potential of such dynamical lattices towards the experimental observation of acoustic rogue waves.
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页数:10
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