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Master's Dissertation
DOI
https://doi.org/10.11606/D.55.2008.tde-12052008-095753
Document
Author
Full name
Juliano Ribeiro de Oliveira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2008
Supervisor
Committee
Frasson, Miguel Vinicius Santini (President)
Azevedo, Katia Andreia Gonçalves de
Cruz, José Hilário da
Title in Portuguese
Comportamento assintótico para soluções de certas equações diferenciais funcionais periódicas
Keywords in Portuguese
Comportamento assintótico
Dominância de autovalores
Equações diferenciais funcionais periódicas
Teoria espectral
Abstract in Portuguese
Estamos interessados em estudar o comportamento assintótico das soluções de uma classe de Equações Diferenciais Funcionais (EDF) lineares e autônomas do tipo neutro, onde os coeficientes, na parte não neutra, são funções periódicas de período comum w! e os retardamentos são múltiplos de w. Para isto, utilizamo-nos da teoria espectral de operadores aplicada ao chamado operador monodrômico 'PI' : C 'SETA' C, cuja ação é evoluir um dado estado um passo de tamanho w. Calculamos o resolvente deste operador, donde inferimos todas as propriedades espectrais que nos permitem determinar o comportamento assintótico das soluções. Mostramos a importância de se determinar autovalores dominantes para a obtenção das estimativas, e mostramos resultados neste sentido. Estudamos em detalhe três exemplos que ilustram a teoria e demonstram sua aplicabilidade
Title in English
Asymptotic behavior of solutions to certain periodic functional differential equations
Keywords in English
Asymptotic behavior
Dominance of eigenvalues
Functional differential equations
Periodic equations
Spectral theory
Abstract in English
We are interested in the study of the asymptotic behavior of the solutions of a class of linear autonomous Functional Differential Equations (FDE) of neutral type, where the coeficients of the non neutral part are periodic functions with common period w and the time delays are multiples of w. We employ the spectral theory for linear operators applied to the so called monodromic operator 'PI' : C 'ARROW'! C, whose action is to evolve a given state one step of size w. We compute the resolvent of this operator, from where we infer the spectral properties that allows us to determine the asymptotic behavior of the solutions. We show the importance to determine whether an eigenvalue is dominant, in order to obtain the estimates for the correspondet solution, and we show results in this direction. Finally we study in detail three examples that illustrate the theory and demonstrate its applicability
 
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Publishing Date
2008-05-12
 
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