Journal
CHINESE PHYSICS C
Volume 44, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1137/abb532
Keywords
deflection of light; Gauss-Bonnet theorem; gravitational lensing; black hole; null aether theory
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We study light rays in the static and spherically symmetric gravitational field of the null aether theory (NAT). To this end, we employ the Gauss-Bonnet theorem to compute the deflection angle formed by a NAT black hole in the weak limit approximation. Using the optical metrics of the NAT black hole, we first obtain the Gaussian curvature and then calculate the leading terms of the deflection angle. Our calculations indicate how gravitational lensing is affected by the NAT field. We also illustrate that the bending of light stems from global and topological effects.
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