Feed-forward networks, center manifolds, and forcing

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August 2012, 32(8): 2913-2935. doi: 10.3934/dcds.2012.32.2913

Feed-forward networks, center manifolds, and forcing

Martin Golubitsky ^1, and Claire Postlethwaite ^2,

1.	Mathematical Biosciences Institute, The Ohio State University, Columbus, OH 43215, United States
2.	Department of Mathematics, University of Auckland, Auckland 1142, New Zealand

Received June 2011 Revised August 2011 Published March 2012

Abstract
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This paper discusses feed-forward chains near points of synchrony-breaking Hopf bifurcation. We show that at synchrony-breaking bifurcations the center manifold inherits a feed-forward structure and use this structure to provide a simplified proof of the theorem of Elmhirst and Golubitsky that there is a branch of periodic solutions in such bifurcations whose amplitudes grow at the rate of $\lambda^{\frac{1}{6}}$. We also use this center manifold structure to provide a method for classifying the bifurcation diagrams of the forced feed-forward chain where the amplitudes of the periodic responses are plotted as a function of the forcing frequency. The bifurcation diagrams depend on the amplitude of the forcing, the deviation of the system from Hopf bifurcation, and the ratio $\gamma$ of the imaginary part of the cubic term in the normal form of Hopf bifurcation to the real part. These calculations generalize the results of Zhang on the forcing of systems near Hopf bifurcations to three-cell feed-forward chains.

Keywords: feed-forward networks, Hopf bifurcation., Center manifolds.

Mathematics Subject Classification: Primary: 34C25; Secondary: 37G1.

Citation: Martin Golubitsky, Claire Postlethwaite. Feed-forward networks, center manifolds, and forcing. Discrete & Continuous Dynamical Systems - A, 2012, 32 (8) : 2913-2935. doi: 10.3934/dcds.2012.32.2913

References:

[1]	N. N. Bogoliubov and Y. A. Mitropolsky, "Asymptotic Methods in the Theory of Non-linear Oscillations,", Translated from the second revised Russian edition, (1961).
[2]	J. Carr, "Applications of Centre Manifold Theory,", Applied Mathematical Sciences, 35 (1981).
[3]	T. Elmhirst and M. Golubitsky, Nilpotent Hopf bifurcations in coupled cell systems,, SIAM J. Appl. Dynam. Sys., 5 (2006), 205. doi: 10.1137/050635559.
[4]	J.-M. Gambaudo, Perturbation of a Hopf bifurcation by an external time-periodic forcing,, J. Diff. Eqns., 57 (1985), 172. doi: 10.1016/0022-0396(85)90076-2.
[5]	M. Golubitsky, M. Nicol and I. Stewart, Some curious phenomena in coupled cell networks,, J. Nonlinear Sci., 14 (2004), 207. doi: 10.1007/s00332-003-0593-6.
[6]	M. Golubitsky, C. Postlethwaite, L.-J. Shiau and Y. Zhang, The feed-forward chain as a filter amplifier motif,, in, 3 (2009), 95.
[7]	M. Golubitsky and D. G. Schaeffer, "Singularities and Groups in Bifurcation Theory,", Vol. I, 51 (1985).
[8]	M. Golubitsky, I. N. Stewart and D. G. Schaeffer, "Singularities and Groups in Bifurcation Theory,", Vol. II, 69 (1988).
[9]	N. J. McCullen, T. Mullin and M. Golubitsky, Sensitive signal detection using a feed-forward oscillator network,, Phys. Rev. Lett., 98 (2007). doi: 10.1103/PhysRevLett.98.254101.
[10]	Y. Zhang, "Periodic Forcing of a System Near a Hopf Bifurcation Point,", Ph.D Thesis, (2010).
[11]	Y. Zhang and M. Golubitsky, Periodically forced Hopf bifurcation,, SIAM J. Appl. Dynam. Sys., ().

show all references

References:

[1]	N. N. Bogoliubov and Y. A. Mitropolsky, "Asymptotic Methods in the Theory of Non-linear Oscillations,", Translated from the second revised Russian edition, (1961).
[2]	J. Carr, "Applications of Centre Manifold Theory,", Applied Mathematical Sciences, 35 (1981).
[3]	T. Elmhirst and M. Golubitsky, Nilpotent Hopf bifurcations in coupled cell systems,, SIAM J. Appl. Dynam. Sys., 5 (2006), 205. doi: 10.1137/050635559.
[4]	J.-M. Gambaudo, Perturbation of a Hopf bifurcation by an external time-periodic forcing,, J. Diff. Eqns., 57 (1985), 172. doi: 10.1016/0022-0396(85)90076-2.
[5]	M. Golubitsky, M. Nicol and I. Stewart, Some curious phenomena in coupled cell networks,, J. Nonlinear Sci., 14 (2004), 207. doi: 10.1007/s00332-003-0593-6.
[6]	M. Golubitsky, C. Postlethwaite, L.-J. Shiau and Y. Zhang, The feed-forward chain as a filter amplifier motif,, in, 3 (2009), 95.
[7]	M. Golubitsky and D. G. Schaeffer, "Singularities and Groups in Bifurcation Theory,", Vol. I, 51 (1985).
[8]	M. Golubitsky, I. N. Stewart and D. G. Schaeffer, "Singularities and Groups in Bifurcation Theory,", Vol. II, 69 (1988).
[9]	N. J. McCullen, T. Mullin and M. Golubitsky, Sensitive signal detection using a feed-forward oscillator network,, Phys. Rev. Lett., 98 (2007). doi: 10.1103/PhysRevLett.98.254101.
[10]	Y. Zhang, "Periodic Forcing of a System Near a Hopf Bifurcation Point,", Ph.D Thesis, (2010).
[11]	Y. Zhang and M. Golubitsky, Periodically forced Hopf bifurcation,, SIAM J. Appl. Dynam. Sys., ().

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