In a toy FRW universe with S¹ × S³ topology, semi-classical Friedman equations with chosen quantum field content permit temporal periodicity, implying periodic entropy reversals consistent with Hawking's arrow-of-time proposal.
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A Breathing Universe is Consistent
In a toy FRW universe with S¹ × S³ topology, semi-classical Friedman equations with chosen quantum field content permit temporal periodicity, implying periodic entropy reversals consistent with Hawking's arrow-of-time proposal.