V. A. De Lorenci, L. G. Gomes, E. S. Moreira Jr
This paper addresses the interplay between vacuum and thermal averages for massless scalar radiation near a plane wall of a large cavity where the Dirichlet boundary condition is assumed to hold. It is shown that the "Stefan constant" depends on the curvature coupling parameter and that the latter is restricted to a certain range by thermodynamic arguments. In more than three spacetime dimensions such a range contains the conformal coupling, but it does not contain the minimal coupling. Findings may be relevant in settings where arbitrarily coupled scalar fields are present.
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http://arxiv.org/abs/1304.6041
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