386 citations · 7.3k across the 146 of their papers we have counts for
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One-loop divergences in higher-derivative gravity
Nobuyoshi Ohta
We give a review of the one-loop divergences in higher derivative gravity theories. We first make the bilinear expansion in the quantum fluctuation on arbitrary backgrounds, introd…
Running Newton Coupling, Scale Identification and Black Hole Thermodynamics
Chiang-Mei Chen, Yi Chen, Akihiro Ishibashi +2
We discuss the quantum improvement of black hole solutions in the context of asymptotic safety. The Newton coupling in this formulation depends on an energy scale, which must be id…
Covariant BRST Quantization of Unimodular Gravity I -- Formulation with antisymmetric tensor ghosts --
Taichiro Kugo, Ryuichi Nakayama, Nobuyoshi Ohta
Unimodular gravity (UG) is an interesting theory that may explain why the cosmological constant is extremely small, in contrast to general relativity (GR). The theory has only the…
Covariant BRST Quantization of Unimodular Gravity II -- Formulation with a vector antighost --
Taichiro Kugo, Ryuichi Nakayama, Nobuyoshi Ohta
In our previous paper, we have presented a covariant BRST quantization of unimodular gravity which may account for the smallness of the cosmological constant, and have shown that t…