The paper reports closed-form central charges a and c for a string-derived EdGB theory and a Lovelock-Horndeski theory, plus a holographic a-theorem check for the latter.
Using standard boundary conditions and suitable ansatz, we solve numerically for black hole solutions in the effective theory (4)
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Holographic Conformal Anomaly and a-Theorem in 5D Scalar-Tensor Theories from Heterotic Strings
The paper reports closed-form central charges a and c for a string-derived EdGB theory and a Lovelock-Horndeski theory, plus a holographic a-theorem check for the latter.