3 papers
gr-qc2026
Extremalization approach to black hole thermodynamics: perturbations around higher-derivative gravities
Aonan Zhang, Qiang Wang, Yong Xiao
When higher-derivative terms are added to a gravitational action, black hole solutions and their thermodynamic properties are generally corrected. Recent progress has shown that, b…
gr-qc2026
Validity of the Background Subtraction Method for Black Hole Thermodynamics in Matter-Coupled Gravity Theories
Yong Xiao, Aonan Zhang
The background subtraction method has long served as a practical tool for computing the Euclidean action and thermodynamic quantities of black holes. While its equivalence to the I…
gr-qc2025
A universal relation among Euclidean integrals for black holes in higher-derivative gravity theories
Yong Xiao, Qiang Wang, Aonan Zhang
In this paper, we establish a universal equality governing Euclidean integrals of gravitational actions in higher-derivative theories. This relation is shown to hold universally fo…