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.
Indeed, it simply comes µκ + = 3 2 [ √ 1 + 32 27(1 − κ B2 0)2 − 1 ]
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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.