Partial Differential Equations
An inequality for the Perron and Floquet eigenvalues of monotone differential systems and age structured equations
[Une inégalité pour les valeurs propres de Floquet et de Perron de systèmes différentiels monotones et d'équations structurées en âge]
Comptes Rendus. Mathématique, Tome 345 (2007) no. 10, pp. 549-554.

La (première) valeur propre de Floquet décrit le taux de croissance des systèmes différentiels linéaires monotones à coefficients périodiques. Nous définissons une moyenne arithmético-géométrique en temps des coefficients, qui nous permet de démontrer que la valeur propre de Perron pour le système ainsi moyenné est plus petite que celle de Floquet. La méthode s'applique aux Équations aux Dérivées Partielles et nous l'utilisons pour un système d'équations structurées en âge qui décrit le cycle cellulaire. Cette opposition entre valeurs propres de Floquet et de Perron modélise la perte de contrôle circadien pour le cycle cellulaire des cellules cancéreuses.

For monotone linear differential systems with periodic coefficients, the (first) Floquet eigenvalue measures the growth rate of the system. We define an appropriate arithmetico-geometric time average of the coefficients for which we can prove that the Perron eigenvalue is smaller than the Floquet eigenvalue. We apply this method to Partial Differential Equations, and we use it for an age-structured systems of equations for the cell cycle. This opposition between Floquet and Perron eigenvalues models the loss of circadian rhythms by cancer cells.

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DOI : 10.1016/j.crma.2007.10.001
Clairambault, Jean 1 ; Gaubert, Stéphane 2 ; Perthame, Benoît 1, 3

1 INRIA, projet BANG, domaine de Voluceau, BP 105, 78153 Le Chesnay cedex, France
2 INRIA, projet MAXPLUS, domaine de Voluceau, BP 105, 78153 Le Chesnay cedex, France
3 Département de mathématiques et applications, UMR 8553, École normale supérieure, 45, rue d'Ulm, 75230 Paris cedex 05, France
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     title = {An inequality for the {Perron} and {Floquet} eigenvalues of monotone differential systems and age structured equations},
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Clairambault, Jean; Gaubert, Stéphane; Perthame, Benoît. An inequality for the Perron and Floquet eigenvalues of monotone differential systems and age structured equations. Comptes Rendus. Mathématique, Tome 345 (2007) no. 10, pp. 549-554. doi : 10.1016/j.crma.2007.10.001. http://www.numdam.org/articles/10.1016/j.crma.2007.10.001/

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