0000000000610391
AUTHOR
Julio Arrechea
Inconsistencies in four-dimensional Einstein-Gauss-Bonnet gravity
We attempt to clarify several aspects concerning the recently presented four-dimensional Einstein-Gauss-Bonnet gravity. We argue that the limiting procedure outlined in [Phys. Rev. Lett. 124, 081301 (2020)] generally involves ill-defined terms in the four dimensional field equations. Potential ways to circumvent this issue are discussed, alongside remarks regarding specific solutions of the theory. We prove that, although linear perturbations are well behaved around maximally symmetric backgrounds, the equations for second-order perturbations are ill-defined even around a Minkowskian background. Additionally, we perform a detailed analysis of the spherically symmetric solutions and find tha…
Comment on “Einstein-Gauss-Bonnet Gravity in Four-Dimensional Spacetime”
We argue that several statements in Phys. Rev. Lett. 124, 081301 (2020) are not correct.