Gaussian estimates for a heat equation on a network

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March 2007, 2(1): 55-79. doi: 10.3934/nhm.2007.2.55

Gaussian estimates for a heat equation on a network

1.	Abteilung Angewandte Analysis der Universität, Helmholtzstraße 18, D-89081, Ulm, Germany

Received February 2006 Revised December 2006 Published December 2006

Abstract
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We consider a diffusion problem on a network on whose nodes we impose Dirichlet and generalized, non-local Kirchhoff-type conditions. We prove well-posedness of the associated initial value problem, and we exploit the theory of sub-Markovian and ultracontractive semigroups in order to obtain upper Gaussian estimates for the integral kernel. We conclude that the same diffusion problem is governed by an analytic semigroup acting on all $L^p$-type spaces as well as on suitable spaces of continuous functions. Stability and spectral issues are also discussed. As an application we discuss a system of semilinear equations on a network related to potential transmission problems arising in neurobiology.

Keywords: Evolution equations on networks; Ultracontractive semigroups of operators; Gaussian estimates.

Mathematics Subject Classification: Primary: 47D06, 47A07; Secondary 90B1.

Citation: Delio Mugnolo. Gaussian estimates for a heat equation on a network. Networks & Heterogeneous Media, 2007, 2 (1) : 55-79. doi: 10.3934/nhm.2007.2.55

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