Time asymptotic behaviour for unbounded linear operator arising in growing cell populations |
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Authors: | Aref Jeribi |
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Institution: | Département de Mathématiques, Faculte des Sciences de Sfax, Route de Soukra, Km 3.5, BP 802, 3018 Sfax, Tunisia |
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Abstract: | This paper is concerned with the spectral analysis of a class of unbounded, linear operators, originally proposed by M. Rotenberg (J. Theor. Biol. 96 (1982) 495; J. Theor. Biol. 103 (1983) 181). After a detailed spectral analysis it is shown that the associated Cauchy problem is governed by a C0-semigroup. Next, we discuss the irreducibility of the transport semigroup. In particular, we show that the transport semigroup is irreducible if the boundary operator is strictly positive. Finally, a spectral decomposition of the solutions into an asymptotic term and a transient one which will be estimated for smooth initial data is given. |
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