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The Casimir effect, Hawking radiation and the trace anomaly

The Casimir energy for the massless scalar field of two parallel conductors in a two-dimensional Schwarzschild black hole background with Dirichlet boundary conditions is calculated by making use of general properties of the renormalized stress tensor. We show that the vacuum expectation value of the stress tensor can be obtained from the Casimir effect, the trace anomaly and Hawking radiation.