Understand
We investigate strong field gravitational lensing by rotating Simpson-Visser black hole, which has an additional parameter ($0\leq l/2M \leq1$), apart from mass ($M$) and rotation parameter ($a$).
- A rotating Simpson-Visser metric correspond to (i) a Schwarzschild metric for $l/2M=a/2M=0$ and $ M \neq 0 $, (ii) a Kerr metric for $l/2M=0$, $|a/2M|< 0.5$ and $ M \neq 0 $ (iii) a rotating regular black hole metric for $|a/2M|< 0.5$, $ M \neq 0 $ and $l/2M$ in the range $0<l/2M<0.5 + \sqrt{\left(0.5\right)^2-(a/2M)^2}$, and (iv) a traversable wormhole for a $|a/2M| >0.5$ and $l/2M\neq 0$.
- We find a decrease in the deflection angle $\alpha_D$ and also in the ratio of the flux of the first image and all other images $ r_{mag}$.
- On the other hand, angular position $\theta_{1}$ increases more slowly and photon sphere radius $x_{m}$ decreases more quickly, but angular separation $s$ increases more rapidly, and their behaviour is similar to that of the Kerr black hole.