3 papers
hep-th2025
Dynamical entropy of charged black objects
Manus R. Visser, Zihan Yan
We develop a general framework for electromagnetic potential-charge contributions to the first law of black hole mechanics, applicable to dynamical first-order perturbations of sta…
gr-qc2025
Generalised focusing theorem and dynamical horizon entropy in diffeomorphism-invariant theories
Zihan Yan
I summarise recent progress on light-ray focusing and horizon thermodynamics in general diffeomorphism-invariant theories of gravity coupled to bosonic matter. In pure gravity and…
gr-qc2024
Gravitational focusing and horizon entropy for higher-spin fields
Zihan Yan
Previously, the Raychaudhuri equation and the focusing theorem in General Relativity were generalised to diffeomorphism-invariant theories of gravity coupled to scalar and vector f…