Hawking Effect in the Spacetime with a Boundary

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Abstract
We examine the thermal property of the vacuum which is defined on a flat space with a static boundary from the viewpoint of an accelerated observer, whose detector cannot respond to all the degrees of freedom of fields. We show that he perceives the appearance of genuine thermal state, as his clock goes on, through the investigation of the behaviour of correlation functions. Also we derive the description of density operator explicitly, and mention the behaviour of entropy briefly.

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