Probing the unitarity of the renormalizable theory of massive conformal gravity

Abstract

Abstract The presence of an unstable massive spin-2 ghost state in the renormalizable theory of massive conformal gravity leads to a pair of complex poles appearing in the first sheet of the energy plane. Here we show that the positions of these poles are gauge dependent, which makes the theory unitary.

Keywords

• Gauge symmetry
• Unitarity
• Quantum Gravity