A four-derivative UV-complete QFT is shown to have consistent perturbative scattering by quantizing on a Krein space with an embedded two-field O(1,1) theory that enforces ghost parity and positive probabilities.
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The Paneitz operator in 4D belongs to extended mimetic gravity and is constrained by gravitational wave propagation speed.
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.
citing papers explorer
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Escape from Ostrogradsky via Hidden Ghost Parity
A four-derivative UV-complete QFT is shown to have consistent perturbative scattering by quantizing on a Krein space with an embedded two-field O(1,1) theory that enforces ghost parity and positive probabilities.
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Gravitational wave constraints on the Paneitz operator
The Paneitz operator in 4D belongs to extended mimetic gravity and is constrained by gravitational wave propagation speed.
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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.