Diversity of traveling wave solutions in FitzHugh-Nagumo type equations

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題名:	Diversity of traveling wave solutions in FitzHugh-Nagumo type equations
作者:	Hsu,CH;Yang,TH;Yang,CR
貢獻者:	數學研究所
關鍵詞:	TRACKING INVARIANT-MANIFOLDS;TURNING-POINTS;STABILITY;SYSTEM
日期:	2009
上傳時間:	2010-06-29 19:38:34 (UTC+8)
出版者:	中央大學
摘要:	In this work we consider the diversity of traveling wave solutions of the FitzHugh-Nagumo type equations u(t) = u(xx) + f (u, w), w(t) = epsilon g(u, w), where f(u, w) = u(u - a(w))(1 - u) for some smooth function a(w) and g(u, w) = u - w. When a(w) crosses zero and one, the corresponding profile equation possesses special turning points which result in very rich dynamics. In [W. Liu, E. Van Vleck, Turning points and traveling waves in FitzHugh-Nagumo type equations. J. Differential Equations 225 (2006) 381-410], Liu and Van Vleck examined traveling waves whose slow orbits lie only on two portions of the slow manifold, and obtained the existence results by using the geometric singular perturbation theory. Based on the ideas of their work, we study the co-existence of different traveling waves whose slow orbits could involve all portions of the slow manifold. There are more complicated and richer dynamics of traveling waves than those of [W. Liu, E. Van Vleck, Turning points and traveling waves in FitzHugh-Nagumo type equations, J. Differential Equations 225 (2006) 381-410]. We give a complete classification of all different fronts of traveling waves, and provide an example to support our theoretical analysis. (C) 2009 Elsevier Inc. All rights reserved.
關聯:	JOURNAL OF DIFFERENTIAL EQUATIONS
顯示於類別:	[數學研究所] 期刊論文

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