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Observations of orbiting hot spots around naked singularities

Sep 8, 2023
24 pages
Published in:
  • JCAP 04 (2024) 032
  • Published: Apr 10, 2024
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Abstract: (IOP)
Recently, it has been reported that photons can traverse naked singularitiesin the Janis-Newman-Winicour and Born-Infeld spacetimes when thesesingularities are appropriately regularized. In this paper, we investigateobservational signatures of hot spots orbiting these naked singularities,with a focus on discerning them from black holes. In contrast to Schwarzschildblack holes, we unveil the presence of multiple additional image trackswithin critical curves in time integrated images capturing a completeorbit of hot spots. Moreover, these new images manifest as a morepronounced second-highest peak in temporal magnitudes when observedat low inclinations.
Note:
  • 24 pages, 6 figures, and 3 animated images of intensity for ancillary. References added and typo corrected
  • gravitational lensing
  • gravity
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