Abstract
In this manuscript, we prove the existence of slow and fast traveling wave solutions in the original Gatenby–Gawlinski model. We prove the existence of a slow traveling wave solution with an interstitial gap. This interstitial gap has previously been observed experimentally, and here we derive its origin from a mathematical perspective. We give a geometric interpretation of the formal asymptotic analysis of the interstitial gap and show that it is determined by the distance between a layer transition of the tumor and a dynamical transcritical bifurcation of two components of the critical manifold. This distance depends, in a nonlinear fashion, on the destructive influence of the acid and the rate at which the acid is being pumped.
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Notes
The cases \(\alpha =1\) and \(\alpha =2\) are the border values for which the characteristics of the slow TW solution change, see Fig. 3. Therefore, they are excluded from Theorem 1.2 as, for instance, for \(\alpha =2\) the layer transition now occurs at the same time as the transcritical bifurcation. This loss of normal hyperbolicity of the critical manifold at the layer transition complicates the proof of the theorem and is hence omitted, see Sect. 4 for more details. That being said, we fully anticipate that the result also holds for \(\alpha =1\) and \(\alpha =2\). That is, for \(\alpha =1\) we expect that \(U=0\) only in the limit \(x \rightarrow -\infty \), while for \(\alpha =2\) the normal cell density is expected to start to grow at the tumor front.
Note that the slow and fast in slow-fast system is not related to the slow and fast in slow TW solution and fast TW solution. This terminology is standard in the GSPT literature and we decided not to change it.
Recall that the slow in slow formulation is not related to the slow in slow TW solution, that is, (12) is the slow formulation of the ODEs associated to both the slow TW solutions with \(p=1/2\) and the fast TW solutions with \(p=0\).
We rearranged the order of the equations in (15) to emphasize the slow-fast structure of the problem.
\(\varepsilon ^{1/4} \ll \varepsilon ^{-(3/8-1/2)}\).
This does not come as a surprise since the V-component of the original PDE (1), in the fast variable y and for \(U=1-\frac{1}{2} \alpha \), is the Fisher–KPP equation \(V_\tau = \beta V (1 - V) + \frac{\alpha }{2} V_{yy}.\)
The expression for \(c_{min}\) also arose from the formal analysis of [4].
The first “2” originates from the number of eigenvalues (22) on \(S_{\mathrm{S}}^2\) with negative real part (i.e the number of fast stable eigenvalues), while the second “2” comes from the number of slow variables.
Here, slow-fast refers to the difference in asymptotic scaling of the (nonlinear) diffusion coefficient of (1).
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Acknowledgements
PD and PvH acknowledge support under the Australian Research Council’s Discovery Early Career Researcher Award Funding Scheme DE140100741. PD acknowledges the support of the Grant No. 20-11027X financed by Czech Science Foundation (GAČR). PvH and RM acknowledge support under the Australian Research Council’s Discovery Project DP200102130. The authors would like to thank Martin Wechselberger, Hinke Osinga, and Bernd Krauskopf for their insightful and productive discussions. PvH and RM would also like to thank the University of Wollongong for their hospitality. This research was initiated during the first Joint Australia-Japan Workshop on Dynamical Systems with Applications in Life Sciences at Queensland University of Technology.
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Davis, P.N., van Heijster, P., Marangell, R. et al. Traveling Wave Solutions in a Model for Tumor Invasion with the Acid-Mediation Hypothesis. J Dyn Diff Equat 34, 1325–1347 (2022). https://doi.org/10.1007/s10884-021-10003-7
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DOI: https://doi.org/10.1007/s10884-021-10003-7