The Effects of Torsion Charge on Optical Appearances and Additional Photon Rings of an Asymmetric Thin-Shell Wormhole

Abstract

In this paper, we study the optical properties of asymmetric thin-shell wormholes (ATWs) with torsion charge. Utilizing the cut-and-paste method developed by Visser, we construct these wormholes and determine their key physical properties such as the radius of the photon sphere and critical impact parameters under different torsion charges. Furthermore, we investigate the effective potential and the behavior of photon motion within the wormhole spacetime, identifying a relationship between photon trajectories and impact parameters. The study focuses on scenarios where thin accretion disks act as the primary light source. It reveals that the optical features of the ATW with torsion charge significantly differ from those of a black hole (BH). Notably, an increase in the torsion charge leads to a reduction in the sizes of both extra photon rings and lensing bands, which serve as important markers for distinguishing and characterizing ATW spacetimes from BHs.