Thermal feedback as a kinetic control mechanism in reaction-diffusion pattern formation

Sudip Dutta; Pushpita Ghosh

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arXiv · 2606.14330

Thermal feedback as a kinetic control mechanism in reaction-diffusion pattern formation

Sudip Dutta·Pushpita Ghosh

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Abstract

Pattern formation in reaction-diffusion systems is traditionally analyzed under isothermal assumptions, overlooking the dynamical role of temperature in systems where reactions generate and dissipate heat. Here, we investigate non-isothermal reaction-diffusion dynamics by coupling activator-inhibitor kinetics to a dynamically evolving temperature field that modulates reaction rates through Arrhenius-type dependencies. This coupling introduces an additional feedback mechanism that influences stability and pattern selection. Through analytical and numerical analysis of the Cholrine dioxide-Iodine-Malonic acid (CDIMA) and Schnakenberg models, we demonstrate that thermal feedback modifies dispersion relations by enhancing instability growth rates and shifting pattern selection toward shorter wavelengths. Beyond these intrinsic effects, we identify a boundary-mediated mechanism in which thermal constraints qualitatively alter global dynamics. In particular, fixed-temperature boundaries induce nonstationary behavior in the CDIMA system, whereas the Schnakenberg model exhibits robust stationary patterns. These results establish thermal-kinetic coupling as a general mechanism for controlling pattern formation and highlight the role of boundary-mediated heat exchange as a tunable parameter for spatiotemporal organization.

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Sudip Dutta, Pushpita Ghosh. 2026-06-12. Thermal feedback as a kinetic control mechanism in reaction-diffusion pattern formation. https://arxiv.org/abs/2606.14330

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