Abstract
We treat the two-dimensional Achucarro-Ortiz black hole (also known as a $1+1$ dilatonic black hole) as a Casimir-type system. The stress tensor of a massless scalar field satisfying Dirichlet boundary conditions on two one-dimensional ``walls'' (``Dirichlet walls'') is explicitly calculated in three different vacua. Without employing known regularization techniques, the expression in each vacuum for the stress tensor is reached by using Wald's axioms. Finally, within this asymptotically nonflat gravitational background, it is shown that the equilibrium of the configurations, obtained by setting the Casimir force to zero, is controlled by the cosmological constant.
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