For flat loop quantum cosmology with logarithmic entropy corrections, the standard generalized second law fails just after the bounce for most correction values, and a sign-flipped law with negative temperatures is valid there instead.
Thiemann, Modern Canonical Quantum General Relativity , Cambridge Monographs on Mathematical Physics (Cambridge University Press, 2007)
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Entropy in Loop Quantum Cosmology
For flat loop quantum cosmology with logarithmic entropy corrections, the standard generalized second law fails just after the bounce for most correction values, and a sign-flipped law with negative temperatures is valid there instead.