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20192021
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math.DS2021

Process-Oriented Geometric Singular Perturbation Theory and Calcium Dynamics

Samuel Jelbart, Nathan Pages, Vivien Kirk +2

Phenomena in chemistry, biology and neuroscience are often modelled using ordinary differential equations (ODEs) in which the right-hand-side is comprised of terms which correspond…

math.DS2021

Singularly Perturbed Boundary-Equilibrium Bifurcations

Samuel Jelbart, Kristian Uldall Kristiansen, Martin Wechselberger

Boundary equilibria bifurcation (BEB) arises in piecewise-smooth systems when an equilibrium collides with a discontinuity set under parameter variation. Singularly perturbed BEB r…

math.DS2020

Singularly Perturbed Boundary-Focus Bifurcations

Samuel Jelbart, Kristian Uldall Kristiansen, Martin Wechselberger

We consider smooth systems limiting as to piecewise-smooth (PWS) systems with a boundary-focus (BF) bifurcation. After deriving a suitable local normal form, we study the…

math.DS2019

Singularly Perturbed Oscillators with Exponential Nonlinearities

Samuel Jelbart, Kristian Uldall Kristiansen, Peter Szmolyan +1

Singular exponential nonlinearities of the form with small occur in many different applications. These terms have essential singularities for leading t…

math.DS2019

Two-Stroke Relaxation Oscillators

Samuel Jelbart, Martin Wechselberger

Two-stroke relaxation oscillations consist of two distinct phases per cycle - one slow and one fast - which distinguishes them from the well-known van der Pol-type 'four-stroke' re…