2 papers
gr-qc2026
What does a regular star look like?
Yu Liang, Yuhao Cui, Kai Lin +5
Recently, astronomers discovered unusual Einstein cross images of the galaxy HerS-3, which feature a bright central spot. Motivated by studies of images produced by regular stars,…
gr-qc2026
A General Discussion on Photon Spheres in Different Categories of Spacetimes
Chen-Kai Qiao, Ping Su, Yang Huang
Photon spheres have attracted considerable interest in the studies of black holes and other astrophysical objects. For different categories of spacetimes (or gravitational sources)…