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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…
gr-qc2024★ 8 cited
Linearised Second Law for Higher Curvature Gravity and Non-Minimally Coupled Vector Fields
Aron C. Wall, Zihan Yan
Expanding the work of arXiv:1504.08040, we show that black holes obey a second law for linear perturbations to bifurcate Killing horizons, in any covariant higher curvature gravity…