Black Hole Shadow Drift and Photon Ring Frequency Drift

  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},
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
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