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복잡계 이론물리 연구단
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Measuring α-FPUT Cores and Tails

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Title
Measuring α-FPUT Cores and Tails
Author(s)
Flach Sergej
Publication Date
2021-12
Journal
Physics, v.3, no.4, pp.879 - 887
Publisher
MDPI AG
Abstract
Almost 70 years ago, the Fermi–Pasta–Ulam–Tsingou (FPUT) paradox was formulated in, observed in, and reported using normal modes of a nonlinear, one-dimensional, non-integrable string. Let us recap the paradox. One normal mode is excited, which drives three or four more normal modes in the core. Then, that is it for quite a long time. So why are many normal modes staying weakly excited in the tail? Furthermore, how many? A quantitative, analytical answer to the latter question is given here using resonances and secular avalanches A comparison with the previous numerical data is made and extremely good agreement is found.
URI
https://pr.ibs.re.kr/handle/8788114/12080
DOI
10.3390/physics3040054
ISSN
2624-8174
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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