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arXiv · 2611.06037

Thermodynamic signatures of the period-doubling route to chemical chaos

Kyota Tamano·Keiji Saito
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Abstract

Chemical reaction networks can evolve from stable oscillations to chaos through successive period doublings. We investigate general properties of entropy-production fluctuations near the onset of chaos and within the chaotic regime in reversible, well-mixed reaction networks. Near an isolated supercritical period-doubling bifurcation, we find a one-sided divergence of the diffusion constant with exponent one. For chaotic attractors satisfying the stated conditions, the entropy variance per unit volume grows exponentially when the macroscopic limit is taken first. Its exponential growth rate is $2λ_{\max}$, where $λ_{\max}$ is the largest Lyapunov exponent, implying a divergent diffusion constant. We also discuss the volume dependence of the fluctuations and the underlying physical mechanisms.

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Kyota Tamano, Keiji Saito. 2026-11-04. Thermodynamic signatures of the period-doubling route to chemical chaos. https://arxiv.org/abs/2611.06037

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