https://doi.org/10.1140/epjc/s10052-022-10638-w
Regular Article - Theoretical Physics
Light trajectory and shadow shape in the rotating naked singularity
1
International Center for Cosmology, Charusat University, 388421, Anand, Gujarat, India
2
International Centre for Space and Cosmology, Ahmedabad University, 380009, Ahmedabad, Gujarat, India
Received:
28
June
2022
Accepted:
24
July
2022
Published online:
7
September
2022
In this paper, we investigate the light trajectories and shadow properties in the rotating version of null naked singularity (NNS) spacetime which is derived using the Newman–Janis algorithm without complexification method. We discuss some of the geometrical properties and causal structure of Rotating Naked Singularity (RNS) spacetime. The gravitational lensing in a rotating naked singularity is analyzed, and the results are compared to those of a Kerr black hole. In the case of a Kerr black hole, the photon sphere exists for both prograde and retrograde photon orbits, whereas for RNS, the photon sphere exists only for retrograde photon orbits. As a result, the naked singularity projects an arc-shaped shadow that differs from the contour-shaped shadow cast by a Kerr black hole.
© The Author(s) 2022
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