Abstract
The brick-wall method is used to study the thermodynamic quantities for perfect relativistic gases in generic spherically symmetric and static background spacetimes possessing a horizon. The Wentzel-Kramers-Brillouin (WKB) approximation is employed for the Teukolsky-type master equation. It is shown that the entropy density, energy density, pressure, and state equation all contain a subleading term, which depends on the spins of the particles of the gases. When particularizing to the Schwarzschild and Reissner-Nordstrom geometries, the results previously found in the literature for those geometries are recovered.
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