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gr-qc2025
The Terrell-Penrose effect revisited and extended for black hole spacetime
Qing-Hua Zhu
Half a century ago, Terrell and Penrose independently studied the visual appearance of a moving sphere and found that the visual distortion can be formulated by a conformal transfo…
astro-ph.HE2025★ 1 cited
Auto- and cross-correlations for multiple images of corotating hotspots in accretion disks
Qing-Hua Zhu
Due to the short gravitational timescale of Sgr A*, variable emissions near the galactic center are expected in the Very-long-baseline interferometry observations. Phenomenological…