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arXiv 2103.07727nlin.CDcond-mat.mtrl-sciphysics.bio-ph
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具有双稳态势的二维离散参数映射的通向混沌之路

Route to chaos in two-dimensional discrete parametric maps with bistable potentials

Alain M. Dikande

AI总结:

本文研究了具有可变形双阱势的二维离散参数映射,发现尽管映射保面积,但通向混沌的路径表现出不同的分岔级联特征,揭示了 Feigenbaum 数序列的非普适性。

摘要:

本文研究了描述相互作用振子晶格的二维离散映射的相空间纹理和分岔图,这些振子被限制在具有可变形双阱形状的 onsite 势中。考虑的两种双阱势属于 Dikandé 和 Kofané(A. M. Dikandé 和 T. C. Kofané, Solid State Commun. vol. 89, p. 559, 1994)提出的一个势族,其形状可以被独特地调节:一种具有可变的势垒高度,另一种具有可变的极小值位置。然而,这两种参数化的双阱势都可简化为 $ϕ^4$ 基底,这在中心对称晶体的结构相变研究或生物物理学中的双稳态过程中是常见的。结果表明,尽管参数映射是保面积的,但它们通向混沌的路径显示出不同的特征:第一个映射在势幅值方面表现出倍周期分岔级联,但在形状可变形性参数方面表现出周期减半分岔。另一方面,第二个映射的首次分岔总是与 $ϕ^4$ 映射的首次叉式分岔重合。然而,可变形性参数的增加缩小了连续倍周期分岔之间的区域。表征第一个映射的两个相反的分岔级联,以及表征第二个映射的连续分岔级联之间区域的缩小,表明与这两个离散参数化双阱映射相关的 Feigenbaum 数序列具有非普适性特征。

英文摘要:

The texture of phase space and bifurcation diagrams of two-dimensional discrete maps describing a lattice of interacting oscillators, confined in on-site potentials with deformable double-well shapes, are examined. The two double-well potentials considered belong to a family proposed by Dikandé and Kofané (A. M. Dikandé and T. C. Kofané, Solid State Commun. vol. 89, p. 559, 1994), whose shapes can be tuned distinctively: one has a variable barrier height and the other has variable minima positions. However the two parametrized double-well potentials reduce to the $ϕ^4$ substrate, familiar in the studies of structural phase transitions in centro-symmetric crystals or bistable processes in biophysics. It is shown that although the parametric maps are area preserving their routes to chaos display different characteristic features: the first map exhibits a cascade of period-doubling bifurcations with respect to the potential amplitude, but period-halving bifurcations with respect to the shape deformability parameter. On the other hand the first bifurcation of the second map always coincides with the first pitchfork bifurcation of the $ϕ^4$ map. However, an increase of the deformability parameter shrinks the region between successive period-doubling bifurcations. The two opposite bifurcation cascades characterizing the first map, and the shrinkage of regions between successive bifurcation cascades which is characteristic of the second map, suggest a non-universal character of the Feigenbaum-number sequences associate with the two discrete parametric double-well maps.

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