Singular optimal control of a 1-D parabolic-hyperbolic degenerate equation
1 Departamento de Matematica, Universidad Tecnica Federico
Santa Maria, Casilla 110-V, Valparaiso, Chile.
2 CEREMADE, UMR 7534, Université Paris-Dauphine & CNRS, Place du Maréchal de Lattre de Tassigny, 75775 Paris cedex 16, France.
Accepted: 7 June 2016
In this paper, we consider the controllability of a strongly degenerate parabolic equation with a degenerate one-order transport term. Despite the strong degeneracy, we prove a result of well-posedness and null controllability with a Dirichlet boundary control that acts on the degenerate part of the boundary. Then, we study the uniform controllability in the vanishing viscosity limit and prove that the cost of the control explodes exponentially fast in small time and converges exponentially fast in large time in some adapted weighted norm. The main tools used are a spectral decomposition involving Bessel functions and their zeros, some usual results on admissibility of scalar controls for diagonal semigroups, and the moment method of Fattorini and Russell.
Mathematics Subject Classification: 35K65 / 93B05 / 30E05
Key words: Degenerate parabolic equation / cost of the control / uniform controllability / Bessel functions
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