Nonlinearly determined wavefronts of the Nicholson's diffusive equation: when small delays are not harmless
| Autor: | Jana Kopfová, Sergei Trofimchuk, Karel Hasik, Petra Nábělková, Zuzana Chladná |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Applied Mathematics
Mathematical analysis Scalar (physics) Function (mathematics) Derivative Delay differential equation Type (model theory) Stability (probability) Monotone polygon Mathematics - Classical Analysis and ODEs 34K12 35K57 92D25 Classical Analysis and ODEs (math.CA) FOS: Mathematics Order (group theory) Analysis Mathematics |
| Popis: | By proving the existence of non-monotone and non-oscillating wavefronts for the Nicholson's blowflies diffusive equation (the NDE), we answer an open question raised in [16]. Surprisingly, these wavefronts can be observed only for sufficiently small delays. Similarly to the pushed fronts, obtained waves are not linearly determined. In contrast, a broader family of eventually monotone wavefronts for the NDE is indeed determined by properties of the spectra of the linearized equations. Our proofs use essentially several specific characteristics of the blowflies birth function (its unimodal form and the negativity of its Schwarz derivative, among others). One of the key auxiliary results of the paper shows that the Mallet-Paret--Cao--Arino theory of super-exponential solutions for scalar equations can be extended for some classes of second order delay differential equations. For the new type of non-monotone waves to the NDE, our numerical simulations also confirm their stability properties established by Mei et al. 22 pages, 4 figure, submitted |
| Databáze: | OpenAIRE |
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