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arXiv · 2512.23339

Small-time global controllability of a class of bilinear fourth-order parabolic equations

Subrata Majumdar·Debanjit Mondal
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Abstract

In this work, we address the small-time global controllability properties of a class of fourth-order nonlinear parabolic equations driven by bilinear controls posed on the one-dimensional torus. The controls depend only on time and act through a prescribed family of spatial profiles. Our first result establishes the small-time global approximate controllability of the system using three scalar controls, between states that share the same sign. This property is obtained by adapting the geometric control approach to the fourth-order setting, using a finite family of frequency-localized controls. We then study the small-time global exact controllability to non-zero constant states for the concerned system. This second result is achieved by analyzing the null controllability of an appropriate linearized fourth-order system and by deducing the controllability of the nonlinear model through a fixed-point argument together with the small-time global approximate control property. To the best of our knowledge, this work provides the first contribution toward the study of controllability properties of fourth-order parabolic equations by means of bilinear controls.

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Subrata Majumdar, Debanjit Mondal. 2025-12-29. Small-time global controllability of a class of bilinear fourth-order parabolic equations. https://arxiv.org/abs/2512.23339

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