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In this paper we investigate the time evolution of the energy density for areal massless scalar field in a two-dimensional spacetime, inside a non-staticcavity, taking as basis the exact numerical approach purposed by Cole andSchieve. Considering Neunmann and Dirichlet boundary conditions, we investigatethe following initial states of the field: vacuum, thermal state, the coherentstate and the Schrodinger cat state.

Time evolution of the energy density inside a non-static cavity with a thermal, coherent and a Schrodinger cat state