In quadratic gravity a bound state between the massive ghost and Faddeev-Popov ghost confines the ghost via the BRST quartet, with its asymptotic field behaving as a massive dipole while the bound state obeys a massive Klein-Gordon equation.
Conformal Symmetry in Quantum Gravity
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Confinement of Massive Ghost in Quadratic Gravity
In quadratic gravity a bound state between the massive ghost and Faddeev-Popov ghost confines the ghost via the BRST quartet, with its asymptotic field behaving as a massive dipole while the bound state obeys a massive Klein-Gordon equation.