Volume 42, Issue 3 pp. 1039-1054
RESEARCH ARTICLE

Linear stability for a free boundary tumor model with a periodic supply of external nutrients

Yaodan Huang

Yaodan Huang

School of Mathematics and Statistics, Xi'an Jiaotong University, Xi'an, PR China

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Zhengce Zhang

Corresponding Author

Zhengce Zhang

School of Mathematics and Statistics, Xi'an Jiaotong University, Xi'an, PR China

Correspondence

Zhengce Zhang, School of Mathematics and Statistics, Xi'an Jiaotong University, Xi'an 710049, PR China.

Email: [email protected]

Communicated by: S. Wise

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Bei Hu

Bei Hu

Department of Applied Computational Mathematics and Statistics, University of Notre Dame, Notre Dame, Indiana

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First published: 06 December 2018
Citations: 18

Abstract

In this paper, we consider a free boundary tumor model with a periodic supply of external nutrients, so that the nutrient concentration σ satisfies σ = ϕ(t) on the boundary, where ϕ(t) is a positive periodic function with period T. A parameter μ in the model is proportional to the “aggressiveness” of the tumor. If urn:x-wiley:mma:media:mma5412:mma5412-math-0001, where urn:x-wiley:mma:media:mma5412:mma5412-math-0002 is a threshold concentration for proliferation, Bai and Xu [Pac J Appl Math. 2013;5;217-223] proved that there exists a unique radially symmetric T-periodic positive solution (σ(r,t),p(r,t),R(t)), which is stable for any μ > 0 with respect to all radially symmetric perturbations.17 We prove that under nonradially symmetric perturbations, there exists a number μ such that if 0 < μ < μ, then the T-periodic solution is linearly stable, whereas if μ > μ, then the T-periodic solution is linearly unstable.

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