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Mathematics > Dynamical Systems

arXiv:1402.4554 (math)
[Submitted on 19 Feb 2014]

Title:Curvature dependence of propagating velocity for a simplified calcium model

Authors:Wenjun Zhang, James Sneyd, Je-Chiang Tsai
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Abstract:It is known that curvature relation plays a key role in the propagation of two-dimensional waves in an excitable model. Such a relation is believed to obey the eikonal equation for typical excitable models (e.g., the FitzHugh-Nagumo (FHN) model), which states that the relation between the normal velocity and the local curvature is approximately linear. In this paper, we show that for a simplified model of intracellular calcium dynamics, although its temporal dynamics can be investigated by analogy with the FHN model, the curvature relation does not obey the eikonal equation. Further, the inconsistency with the eikonal equation for the calcium model is because of the dispersion relation between wave speed $s$ and volume-ratio parameter $\gamma$ in the closed-cell version of the model, not because of the separation of the fast and the slow variables as in the FHN model. Hence this simplified calcium model may be an unexpected excitable system, whose wave propagation properties cannot be always understood by analogy with the FHN model.
Subjects: Dynamical Systems (math.DS)
Cite as: arXiv:1402.4554 [math.DS]
  (or arXiv:1402.4554v1 [math.DS] for this version)
  https://doi.org/10.48550/arXiv.1402.4554

Submission history

From: Wenjun Zhang [view email]
[v1] Wed, 19 Feb 2014 03:34:03 UTC (2,376 KB)
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