In nonminimally coupled gravity, the comoving entropy of radiation evolves as S proportional to f2 to the power -3/4, so it can decrease during contraction, violating the second law in its standard form.
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Second law of thermodynamics in nonminimally coupled gravity
In nonminimally coupled gravity, the comoving entropy of radiation evolves as S proportional to f2 to the power -3/4, so it can decrease during contraction, violating the second law in its standard form.