Quadratic gravity in 4D preserves unitarity because the extra spin-2 sector is a dual inverted harmonic oscillator with vanishing spectral density, yielding a principal-value propagator that satisfies the optical theorem with only virtual contributions.
Strict renormalizability as a paradigm for fundamental physics
1 Pith paper cite this work. Polarity classification is still indexing.
1
Pith paper citing it
fields
hep-th 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
citing papers explorer
-
Unitary Quadratic Quantum Gravity in 4D
Quadratic gravity in 4D preserves unitarity because the extra spin-2 sector is a dual inverted harmonic oscillator with vanishing spectral density, yielding a principal-value propagator that satisfies the optical theorem with only virtual contributions.