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gr-qc2026
A universal lower bound on the photon sphere radius in higher-dimensional black holes
Yong Song, Jiaqi Fu, Yiting Cen
The photon sphere, a hypersurface of circular null geodesics, plays a fundamental role in characterizing black hole spacetimes, influencing phenomena such as black hole shadows, gr…
gr-qc2026
Bounds on the photon sphere radius for spherically symmetric black holes in n-dimensional Einstein gravity
Yong Song, Jiaqi Fu, Yiting Cen
The photon sphere, a hypersurface of null circular geodesics, plays a fundamental role in characterizing black hole spacetimes, influencing phenomena such as black hole shadows, gr…