We derive the dark energy fluid equation of state P=−ϵ=const. as an extremum of entropy, subject to the Hamiltonian constraint of General Relativity. However, we identify perturbations that can render this extremum an entropy minimum designating a thermodynamic instability and specify the mathematical condition for this to occur.
Roupas, Z. (2023). Thermodynamic instability of dark energy equation of state. PHYSICS OF THE DARK UNIVERSE, 40(May 2023) [10.1016/j.dark.2023.101181].
Thermodynamic instability of dark energy equation of state
Roupas Z.
2023
Abstract
We derive the dark energy fluid equation of state P=−ϵ=const. as an extremum of entropy, subject to the Hamiltonian constraint of General Relativity. However, we identify perturbations that can render this extremum an entropy minimum designating a thermodynamic instability and specify the mathematical condition for this to occur.
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