Abstract
The chapter proposes a systematic method for fixed point bifurcation analysis in circadian cells and similar biological models using interval polynomials theory. The stages for performing fixed point bifurcation analysis in such biological systems comprise (i) the computation of fixed points as functions of the bifurcation parameter and (ii) the evaluation of the type of stability for each fixed point through the computation of the eigenvalues of the Jacobian matrix that is associated with the system’s nonlinear dynamics model. Stage (ii) requires the computation of the roots of the characteristic polynomial of the Jacobian matrix. This problem is nontrivial since the coefficients of the characteristic polynomial are functions of the bifurcation parameter and the latter varies within intervals. To obtain a clear view about the values of the roots of the characteristic polynomial and about the stability features they provide to the system, the use of interval polynomials theory and particularly of Kharitonov’s stability theorem is proposed. In this approach the study of the stability of a characteristic polynomial with coefficients that vary in intervals is equivalent to the study of the stability of four polynomials with crisp coefficients computed from the boundaries of the aforementioned intervals. The efficiency of the proposed approach for the analysis of fixed points bifurcations in nonlinear models of biological neurons is tested through numerical and simulation experiments.
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Rigatos, G.G. (2015). Bifurcations and Limit Cycles in Models of Biological Systems. In: Advanced Models of Neural Networks. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-43764-3_3
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DOI: https://doi.org/10.1007/978-3-662-43764-3_3
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