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arXiv · 2604.09530

Slow-moving pattern interfaces in general directions for a two-dimensional Swift-Hohenberg-type equation

Bastian Hilder·Jonas Jansen
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Abstract

We rigorously prove the bifurcation of slow-moving pattern interfaces with general direction in a two-dimensional Swift-Hohenberg-type model close to a Turing instability for a large class of nonlinearities. These interfaces describe the invasion of stripe and hexagonal patterns into the spatially homogeneous state and model a possible mechanism for pattern formation, as observed in a wide range of real-world applications. For this, we develop a rigorous framework to establish the existence of such solutions using spatial dynamics and non-standard centre manifold theory. Our approach exploits geometric and algebraic structures generic to $\mathrm{O}(2)$-symmetric pattern-forming systems near a Turing instability, and addresses fundamental technical challenges due to a non-uniform spectral gap around the imaginary axis, quadratic resonances induced by the hexagonal structure, and the high-dimensional phase space of the reduced equations.

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Bastian Hilder, Jonas Jansen. 2026-04-10. Slow-moving pattern interfaces in general directions for a two-dimensional Swift-Hohenberg-type equation. https://arxiv.org/abs/2604.09530

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