Three homogeneous universes with distinct matter content obey the same thermodynamic equation for energy density, implying vanishing cosmological constant in vacuum.
Duff, The cosmological constant is possibly zero, but the proof is probably wrong, Phys.\ Lett.\ B 226 , 36 (1989); Z.C
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Thermodynamics of homogeneous Universes: de Sitter, Bonnor-Melvin and static Einstein
Three homogeneous universes with distinct matter content obey the same thermodynamic equation for energy density, implying vanishing cosmological constant in vacuum.