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arXiv 1801.02865nlin.CDcond-mat.stat-mech
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一维格点$ϕ^4$理论中的对称性、混沌和温度

Symmetry, chaos and temperature in the one-dimensional lattice $ϕ^4$ theory

Kenichiro Aoki

摘要:

系统地分析了格上极小$ϕ^4$理论的对称性。我们发现,对称性可以限制轨道的子空间,而他们的运动仍然是混沌的。讨论了自治Hamilton系统的混沌动力学,并与热力学定律相联系。本文研究了哈密顿系统中稳态时理想气体温度不相等的组态的可能性,并找到了系统内理想气体温度不相等的小系统的例子。(有限时间)李雅普诺夫指数进行了分析,并研究了它们对各种因素的依赖性,如系统的能量,初始条件的特性,和讨论我们发现,对于$ϕ^4$理论,更高的能量导致更快的配对时间。我们还发现对称性会阻碍局部李雅普诺夫指数的配对,以及李雅普诺夫指数的收敛。

英文摘要:

The symmetries of the minimal $ϕ^4$ theory on the lattice are systematically analyzed. We find that symmetry can restrict trajectories to subspaces, while their motions are still chaotic. The chaotic dynamics of autonomous Hamiltonian systems are discussed, in relation to the thermodynamic laws. Possibilities of configurations with non-equal ideal gas temperatures in the steady state, in Hamiltonian systems, are investigated, and examples of small systems in which the ideal gas temperatures are different within the system are found. The pairing of local (finite-time) Lyapunov exponents are analyzed, and their dependence on various factors, such as the energy of the system, the characteristics of the initial conditions are studied, and discussed. We find that for the $ϕ^4$ theory, higher energies lead to faster pairing times. We also find that symmetries can impede the pairing of local Lyapunov exponents, and the convergence of Lyapunov exponents.

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