Quadratic gravity is canonically quantized with BRST methods, yielding vanishing equal-time commutators for the metric and exposing a massless graviton, a massive scalar, and a negative-norm massive ghost.
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Manifestly Covariant Canonical Formalism of Quadratic Gravity
Quadratic gravity is canonically quantized with BRST methods, yielding vanishing equal-time commutators for the metric and exposing a massless graviton, a massive scalar, and a negative-norm massive ghost.