A computer-assisted proof of dynamo growth in the stretch-fold-shear map
A computer-assisted proof of dynamo growth in the stretch-fold-shear map
复制标题
拉伸-折叠-剪切图中发电机增长的计算机辅助证明
DOI:
10.1080/14689367.2022.2139224
复制
发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Pramy F
中科院分区:
文献类型:
--
作者:
Pramy F
The Stretch-Fold-Shear (SFS) operatoris a functional linear operator acting on complex-valued functions of a real variablexon some domain containinginIt arises from a stylized model in kinematic dynamo theory where magnetic field growth corresponds to an eigenvalue of modulus greater than 1. When the shear parameterαis zero, the spectrum ofcan be determined exactly, and the eigenfunctions corresponding to non-zero eigenvalues are related to the Bernoulli polynomials. The spectrum forhas not been rigorously determined although the spectrum has been approximated numerically. In this paper, a computer-assisted proof is presented to provide rigorous bounds on the leading eigenvalue for, showinginter aliathathas an eigenvalue of modulus greater than 1 for allαsatisfying, thereby partially confirming an outstanding conjecture on the SFS operator.
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DOI:
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