Starting from a quadratic Einstein-frame potential, f(R) gravity is mapped onto a van der Waals-like thermodynamic system in which inflation appears as a metastable phase and its exit as a first-order phase transition.
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Thermodynamics of $f(R)$ Theories
Starting from a quadratic Einstein-frame potential, f(R) gravity is mapped onto a van der Waals-like thermodynamic system in which inflation appears as a metastable phase and its exit as a first-order phase transition.