Noether current from the surface term of gravitational action, Virasoro algebra and horizon entropy

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In fact the Davis-Unruh effect suggests that all thermodynamic variables (like the temperature, entropy etc. of a glass of water) must be treated as observer dependent. This follows from the fact that a glass of water is a highly excited state of the vacuum and if inertial and Rindler observers assign different temperatures, say, to the vacuum they will also assign different temperatures to the glass of water
Cited in the paper.