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복잡계 이론물리 연구단
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Intermittent many-body dynamics at equilibrium

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Title
Intermittent many-body dynamics at equilibrium
Author(s)
Carlo Danieli; D.K. Campbell; Sergej Flach
Publication Date
2017-06
Journal
PHYSICAL REVIEW E, v.95, no.6, pp.060202 -
Publisher
American Physical Society
Abstract
The equilibrium value of an observable denes a manifold in the phase space of an ergodic and equipartitioned many-body system. A typical trajectory pierces that manifold innitely often as time goes to innity. We use these piercings to measure both the relaxation time of the lowest frequency eigenmode of the Fermi-Pasta-Ulam chain (FPU), as well as the uctuations of the subsequent dynamics in equilibrium. The dynamics in equilibrium is characterized by a power-law distribution of excursion times far o equilibrium, with diverging variance. Long excursions arise from sticky dynamics close to q-breathers localized in normal mode space. Measuring the exponent allows to predict the transition into nonergodic dynamics. We generalize our method to Klein-Gordon lattices (KG) where the sticky dynamics is due to discrete breathers localized in real space. (c) 2017 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/3618
DOI
10.1103/PhysRevE.95.060202
ISSN
1539-3755
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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