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浙江大学学报(理学版)  2024, Vol. 51 Issue (2): 205-211    DOI: 10.3785/j.issn.1008-9497.2024.02.009
物理学     
Lévy噪声和高斯白噪声驱动的非对称三稳系统的相转移问题研究
刘倩茹,郭永峰()
天津工业大学 数学科学学院,天津 300387
Phase transitions driven by Lévy noise and Gaussian white noise in an asymmetric tristable system
Qianru LIU,Yongfeng GUO()
School of Mathematics Sciences,Tiangong University,Tianjin 300387,China
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摘要:

讨论了非对称三稳系统在Lévy噪声和高斯白噪声共同驱动下的相转移问题。采用四阶Runge-Kutta算法,计算了系统的稳态概率密度函数,通过改变系统参数和噪声参数观察其稳态概率密度函数曲线形态的变化情况。研究发现,非对称参数、加性噪声强度、乘性噪声强度、稳定性指标、偏斜参数均可诱导系统相转移,当分别改变加性噪声强度和乘性噪声强度时,概率密度函数的峰数与高度的变化情况相反。此外,在相同的非对称参数下,随着偏斜参数正负取值的变化,概率密度曲线图中峰的结构亦呈现不同的现象。

关键词: 非对称三稳系统Lévy噪声稳态概率密度噪声诱导相变    
Abstract:

In this paper, the phenomenon of phase transition is studied in an asymmetric tristable model driven by Lévy noise and Gaussian white noise. First, the fourth-order Runge-Kutta algorithm is used to simulate the stationary probability density of the system. Then we observe the shape of the stationary probability density curve by adjusting the system parameters and noise parameters. It has been found that asymmetric parameter, additive noise intensity, multiplicative noise intensity, the stability index, and the skewness parameter can all induce phase transition. Moreover, the influence of additive noise intensity and multiplicative noise intensity on the number and height of stationary probability density peaks is opposite. We also found that under the same asymmetric parameters, the influence of positive and negative skewness parameters on the stationary probability density is different.

Key words: asymmetric tristable system    Lévy noise    stationary probability density noise    noise induced phase transition
收稿日期: 2021-12-13 出版日期: 2024-03-08
CLC:  O 414.2  
基金资助: 国家自然科学基金资助项目(11672207);天津市自然科学基金项目(17JCYBJC15700)
通讯作者: 郭永峰     E-mail: sdjnwsgyf@163.com
作者简介: 刘倩茹(1998—),ORCID:https://orcid.org/0009-0008-2293-3983,女,硕士研究生,主要从事应用概率统计研究.
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引用本文:

刘倩茹,郭永峰. Lévy噪声和高斯白噪声驱动的非对称三稳系统的相转移问题研究[J]. 浙江大学学报(理学版), 2024, 51(2): 205-211.

Qianru LIU,Yongfeng GUO. Phase transitions driven by Lévy noise and Gaussian white noise in an asymmetric tristable system. Journal of Zhejiang University (Science Edition), 2024, 51(2): 205-211.

链接本文:

https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2024.02.009        https://www.zjujournals.com/sci/CN/Y2024/V51/I2/205

图1  不同非对称参数下的势函数k1=2,k2=0.8,k3=0.06
图2  三稳系统的响应解α=1.1,D=0.1,Q=0.5,r=0
图3  非对称参数r取不同值时Pst(x)的变化曲线D=0.1,Q=0.5,α=1.4,β=0
图4  乘性噪声强度D取不同值时Pst(x)的变化曲线Q=0.5,α=1.4,β=0,r=0.2
图5  加性噪声强度Q取不同值时Pst(x)的变化曲线D=0.1,α=1.4,β=0,r=0.2
图6  稳定性指标α取不同值时Pst(x)的变化曲线D=0.1,Q=0.5,β=0,r=0.2
图7  偏斜参数β取不同值时Pst(x)的变化曲线
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