The authors claim that canonical quantization of Einstein-Hilbert plus Gauss-Bonnet squared gravity requires a cosmological constant to resolve contradictions, but the contradictions appear to follow from questionable assumptions rather than from the theory itself.
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The role of cosmological constant in f(R, G) gravity
The authors claim that canonical quantization of Einstein-Hilbert plus Gauss-Bonnet squared gravity requires a cosmological constant to resolve contradictions, but the contradictions appear to follow from questionable assumptions rather than from the theory itself.