Abstract
The energy-momentum tensor of a quantum massless free field in a curved spacetime can be written in many cases as an integral with a thermal denominator and a modified phase-space numerator. It is shown that in general the thermal denominator is related to the bounded nature of the system, which in turn implies a representation of the energy density as an infinite numerable sum in Fock space. The modification of the phase-space density is related to the absence of long-wave contributions for nonzero values of the spin.
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Cocho, G., Hacyan, S., Sarmiento, A. et al. Thermal representation of the energy density in bounded spaces. Int J Theor Phys 28, 699–709 (1989). https://doi.org/10.1007/BF00669817
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DOI: https://doi.org/10.1007/BF00669817