Spatial asymmetries of resonant oscillations in periodically forced heterogeneous media

PHYSICA D-NONLINEAR PHENOMENA

卷:410

Article

Edri, Yuval^1,3  Meron, Ehud^1,2  Yochelis, Arik^1,2 

[1] Ben Gurion Univ Negev, Dept Solar Energy & Environm Phys, Swiss Inst Dryland Environm & Energy Res, Blaustein Inst Desert Res, Sede Boger Campus, IL-8499000 Midreshet Ben Gurion, Israel

[2] Ben Gurion Univ Negev, Dept Phys, IL-8410501 Beer Sheva, Israel

[3] Rockefeller Univ, Lab Sensory Neurosci, New York, NY 10065 USA

关键词: Coupled oscillations;    Resonance;    Bistability;    Front dynamics;    Pattern formation;   

DOI  :  10.1016/j.physd.2020.132501

来源: Elsevier

【 摘 要 】

Spatially localized oscillations in periodically forced systems are intriguing phenomena. They may occur in spatially homogeneous media (oscillons), but quite often emerge in heterogeneous media, such as the auditory system, where localized oscillations are believed to play an important role in frequency discrimination of incoming sound waves. In this paper, we use an amplitude-equation approach to study the spatial profile of the oscillations and the factors that affect it. More specifically, we use a variant of the forced complex Ginzburg-Landau (FCGL) equation to describe an oscillatory system below the Hopf bifurcation with space-dependent Hopf frequency, subject to both parametric and additive forcing. We show that spatial heterogeneity, combined with bistability of system states, results in spatial asymmetry of the localized oscillations. We further identify parameters that control that asymmetry, and characterize the spatial profile of the oscillations in terms of maximum amplitude, location, width and asymmetry. Our results bear qualitative similarities to empirical observation trends that have found in the auditory system. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

Free