# Black Hole Shadow Drift and Photon Ring Frequency Drift

@article{Frion2021BlackHS, title={Black Hole Shadow Drift and Photon Ring Frequency Drift}, author={Emmanuel Frion and Leonardo Giani and Tays Miranda}, journal={The Open Journal of Astrophysics}, year={2021} }

The apparent angular size of the shadow of a black hole in an expanding Universe is redshift-dependent. Since cosmological redshifts change with time known as the redshift drift all redshift-dependent quantities acquire a time dependence, and a fortiori so do black hole shadows. We find a mathematical description of the black hole shadow drift and show that the amplitude of this effect is of order 10−16 per day for M87. While this effect is small, we argue that its non-detection can be used to… Expand

#### One Citation

Shadow and Photon Sphere of Black Hole in Clouds of Strings and Quintessence

- Physics
- 2021

Aoyun He,∗ Jun Tao,† Yadong Xue,‡ and Lingkai Zhang§ Center for Theoretical Physics, College of Physics, Sichuan University, Chengdu, 610065, China Abstract In this work, we study the shadow and… Expand

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