Do we have unitary and (super)renormalizable quantum gravity below the Planck scale?
Do we have unitary and (super)renormalizable quantum gravity below the Planck scale?
We explore how the stability of metric perturbations in higher derivative theories of gravity depends on the energy scale of initial seeds of such perturbations and on a typical energy scale of the gravitational vacuum background. It is shown that, at least in the cases of specific cosmological backgrounds, that …