Quadratic Weyl gravity stays viable only when its coupling obeys 10^14 H0^2 less than about 1/alpha and 1/alpha far below the cutoff squared; smaller values suppress structure growth and negative values are classically unstable.
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Analytical constraints on gravitational models with a quadratic Weyl tensor
Quadratic Weyl gravity stays viable only when its coupling obeys 10^14 H0^2 less than about 1/alpha and 1/alpha far below the cutoff squared; smaller values suppress structure growth and negative values are classically unstable.