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hep-th2026
Saddle-Order Universality in Ensemble-Averaged Black Hole Thermodynamics
Ankit Anand, Peng Cheng
We establish a saddle-order proposition for the ensemble-averaged generalized free energy in reduced Euclidean black hole ensembles. Under regularity and stability assumptions, the…
hep-th2026
Universal Lichnerowicz Lifting of Near-Horizon Soft Modes
Peng Cheng, Yu-Qi Liu
A recurring universality appears in the low-temperature quantum thermodynamics of near-extremal black holes, where distinct parent geometries often lead to the same logarithmic tem…
gr-qc2026
On the Universal Cuspy Behavior in Black Hole Shadows
Peng Cheng, Si-Jiang Yang
This work investigates the universality of cusp formation in the shadows of compact objects. The emergence of cusps is accompanied by three interrelated phenomena: a topological ch…