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Zbl 1067.34076
Song, Yongli; Wei, Junjie
Local Hopf bifurcation and global periodic solutions in a delayed predator--prey system. (English)
[J] J. Math. Anal. Appl. 301, No. 1, 1-21 (2005). ISSN 0022-247X

The article considers a delayed predator-prey system of the form $$\align\dot x(t)&=x(t)[r_1-a_{11}x(t-\tau)-a_{12}y(t)],\\ \dot y(t)&=y(t)[-r_2+a_{21}x(t)-a_{22}y(t)],\endalign$$ where all constants are positive. First, the authors discuss the existence of local Hopf bifurcations, deriving explicit formulas for the stability and direction of the branch of periodic solutions emerging from the Hopf bifurcation. This is achieved using normal form theory and center manifold theory. Next, the authors consider the global existence of periodic solutions bifurcating from the Hopf bifurcation. Using a result from {\it J. Wu} [Trans. Am. Math. Soc. 350, No. 12, 4799--4838 (1998; Zbl 0905.34034)], they prove that, for delays greater than a critical value, there always exist periodic solutions. Finally, several numerical simulations supporting the theoretical analysis are given.
[Jan Sieber (Bristol)]

MSC 2000:: *34K18 Bifurcation theory of functional differential equations
34K13 Periodic solutions of functional differential equations

Keywords: time delay; Hopf bifurcation; global Hopf bifurcation; periodic solutions

Citations: Zbl 0905.34034

Cited in: Zbl 1090.92052

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