Accelerating Cycle Expansions by Dynamical Conjugacy |
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Authors: | Ang?Gao Jianbo?Xie Email author" target="_blank">Yueheng?LanEmail author |
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Institution: | 1.The Department of Physics,Tsinghua University,Beijing,China;2.The Department of Physics,UC Berkeley,Berkeley,USA |
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Abstract: | Periodic orbit theory provides two important functions—the dynamical zeta function and the spectral determinant for the calculation
of dynamical averages in a nonlinear system. Their cycle expansions converge rapidly when the system is uniformly hyperbolic
but greatly slow down in the presence of non-hyperbolicity. We find that the slow convergence can be attributed to singularities
in the natural measure. A properly designed coordinate transformation may remove these singularities and results in a dynamically
conjugate system where fast convergence is restored. The technique is successfully demonstrated on several examples of one-dimensional
maps and some remaining challenges are discussed. |
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Keywords: | |
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