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arXiv 2303.02501nlin.CDmath-phmath.MP
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阶数 0 < alpha < 1 的广义分数阶映射中的分岔与通向混沌的转变

Bifurcations and transition to chaos in generalized fractional maps of the orders 0 < alpha < 1

Mark Edelman, Avigayil B. Helman, Rasa Smidtaite

AI总结:

本文研究阶数 0<alpha<1 的广义分数阶映射,推导分岔点代数方程,数值模拟表明其通向混沌的分岔级联与正则映射相似,且广义 Feigenbaum 常数与正则常数相同。

摘要:

阶数 0 < alpha < 1 的广义分数阶映射是卷积型的 Volterra 差分方程,其核的差分绝对可和,但核的级数发散。应用中常用的分数阶映射(具有幂律核)和分数阶差分映射(具有下降阶乘核),其阶数 0 < alpha < 1,都属于此类映射。我们推导了代数方程,使得能够计算广义分数阶映射的分岔点。我们计算了分岔点,并绘制了分数阶和分数阶差分 logistic 映射的分岔图。尽管在分数阶映射中,单个轨迹上通向混沌的转变可能以分岔级联类型行为和零 Lyapunov 指数为特征,但我们的数值模拟结果使我们能够推测:广义分数阶映射和正则映射中通向混沌的分岔级联情景是相似的,并且广义分数阶 Feigenbaum 常数 df 的值与正则 Feigenbaum 常数 delta = 4.669... 的值相同。

英文摘要:

Generalized fractional maps of the orders 0 < alpha < 1 are Volterra difference equations of convolution type with kernels, which differences are absolutely summable, but the series of kernels are diverging. Commonly used in applications fractional (with the power-law kernels) and fractional difference (with the falling factorial kernels) maps of the orders 0 < alpha < 1 belong to this class of maps. We derived the algebraic equations which allow the calculation of bifurcation points of generalized fractional maps. We calculated the bifurcation points and drew bifurcation diagrams for the fractional and fractional difference logistic maps. Although the transition to chaos on individual trajectories in fractional maps may be characterized by the cascade of bifurcations type behavior and zero Lyapunov exponents, the results of our numerical simulations allow us to make a conjecture that the cascade of bifurcations scenarios of transition to chaos in generalized fractional maps and regular maps are similar, and the value of the generalized fractional Feigenbaum constant df is the same as the value of the regular Feigenbaum constant delta = 4.669....

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