Photonsphere, shadow, quasinormal modes, and greybody bounds of non-rotating Simpson–Visser black hole

In this manuscript, we study photonsphere, shadow, quasinormal modes, Hawking temperature, and greybody bounds of a non-rotating Simpson-Visser black hole which is regular hole. We observe that though the radius photonsphere does depend on parameter $\alpha$, shadow independent it. The found to be equal for Schwarzschild We, then, frequencies scalar electromagnetic perturbations with help $6$th order WKB method. tabulate values various angular momentum $\ell$, overtone number $n$. also graphically show dependence real imaginary parts frequency $\alpha$ $\ell$. Additionally, convergence method pair $(n,\ell)$. Finally, shed light temperature