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The invari- ance of QG under diffeomorphisms yields a Ward identity guaranteeing that renormal- ization preserves the special form of the PS Lagrangian

With Anderson, Herzog we have shown that PS theory describes a specific limit – the conformally flat limit – of quadratic gravity (QG), the renormalizable theory of quantum grav

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Escape from Ostrogradsky via Hidden Ghost Parity

hep-th · 2026-06-30 · unverdicted · novelty 7.0

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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  • Escape from Ostrogradsky via Hidden Ghost Parity hep-th · 2026-06-30 · unverdicted · none · ref 1

    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.