Hotspots and Photon Rings in Spherically-Symmetric Spacetimes

@misc{wielgus2024hotspotsphotonrings,
      title={Hotspots and Photon Rings in Spherically-Symmetric Spacetimes}, 
      author={Maciek Wielgus and Prashant Kocherlakota and Luciano Rezzolla and Rittick Roy},
      year={2024},
      eprint={2403.08862},
      archivePrefix={arXiv},
      primaryClass={astro-ph.HE},
      url={https://arxiv.org/abs/2403.08862}, 
}