Einstein-Gauss-Bonnet dynamical compactification with constant extra dimensions is unstable in the tensor sector, and the stable flat alternative violates the gravitational wave speed bound.
(3.15) The no-ghost condition thus read K = B4 0 − 4κ B2 0 + 2 B2 0(B2 0 − κ) and ~K = − 2 B2 0 − κ B2 0 − κ
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Gauss-Bonnet dynamical compactification scenarios and their ghosts in the tensor sectors
Einstein-Gauss-Bonnet dynamical compactification with constant extra dimensions is unstable in the tensor sector, and the stable flat alternative violates the gravitational wave speed bound.