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• W4382061498 abstract "In this paper, we use geometric singular perturbation theory and blowup as our main technical tool to study the mixed-mode oscillations (MMOs) that occur in two coupled FitzHugh–Nagumo units with symmetric and repulsive coupling. In particular, we demonstrate that the MMOs in this model are not due to generic folded singularities, but rather due to singularities at a cusp – not a fold – of the critical manifold. Using blowup, we determine the number of small-amplitude oscillations (SAOs) analytically, showing–-as for the folded nodes–-that they are determined by the Weber equation and the ratio of eigenvalues. We also show that the model undergoes a saddle-node bifurcation in the desingularized reduced problem, which–-although resembling a folded saddle-node (type II) at this level–-also occurs on a cusp, and not a fold. We demonstrate that this bifurcation is associated with the emergence of an invariant cylinder, the onset of SAOs, as well as SAOs of increasing amplitude. We relate our findings with numerical computations and find excellent agreement." @default.
• W4382061498 created "2023-06-27" @default.
• W4382061498 creator A5012378349 @default.
• W4382061498 creator A5030956192 @default.
• W4382061498 date "2023-06-26" @default.
• W4382061498 modified "2023-10-02" @default.
• W4382061498 title "Mixed-Mode Oscillations in Coupled FitzHugh–Nagumo Oscillators: Blow-Up Analysis of Cusped Singularities" @default.
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• W4382061498 doi "https://doi.org/10.1137/22m1480495" @default.
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