Note on WAdS${}_3$ black holes in extended BHT gravity

In this letter, we study a holographic diffeomorphism invariant higher-derivative extension of Bergshoeff-Hohm-Townsend (BHT) cosmological gravity in the context of Wald’s formalism. We calculate the entropy, mass and angular momentum of warped anti-de Sitter (WAdS${}_3$) black holes in ghost-free BHT massive gravity and its extension using the covariant phase space method. We also compute the central charges of the dual boundary conformal field theories (CFT) from the thermodynamics method.