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A uniform ergodic theorem for degenerate flows on the annulus
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A uniform ergodic theorem for degenerate flows on the annulus
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Paper
A uniform ergodic theorem for degenerate flows on the annulus
2023
Overview
Motivated by the well-known phase-space portrait of the nonlinear pendulum, the purpose of this paper is to obtain convergence rates in the ergodic theorem for flows in the plane that have arbitrarily slow trajectories. Considering bounded periodic trajectories near the heteroclinic orbits, it is shown that despite lacking a spectral gap, there exists a functional space (which is a strict subset of \\(L^2\\)) on which time averages converge uniformly to spatial averages (with an explicit rate). The main ingredient of the proof is an estimate of the density of the spectrum of the generator of the flow near zero.
Publisher
Cornell University Library, arXiv.org
Subject
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