OICC Press Journal of Theoretical and Applied Physics 2251-7235 18 1 2024 01 10 Deflection of null and time-like geodesics in topological defects space-time geometry 10.57647/j.jtap.2024.1801.12 EN Faizuddin Ahmed Department of Physics, University of Science and Technology Meghalaya, Ri-Bhoi, Meghalaya-793101, India 0000-0003-2196-9622 Abdul Kayum Department of Physics, University of Science and Technology Meghalaya, Ri-Bhoi, Meghalaya-793101, India Monjur Alom Choudhury Department of Physics, University of Science and Technology Meghalaya, Ri-Bhoi, Meghalaya-793101, India Mahmudul Hassan Department of Physics, University of Science and Technology Meghalaya, Ri-Bhoi, Meghalaya-793101, India Journal Article 2024 01 10 In this research, we investigate the bending of photon light and/or time-like geodesics within the context of four-dimensional space-time geometry, specifically in the presence of topological defects. These topological defects manifest as cosmic string space-time configurations, encompassing screw dislocation, spiral dislocation, and spacelike dislocation. Our primary objective is to determine the extent of deflection experienced by light-like and time-like geodesics and analyze how this deflection is affected by the cosmic string parameter, screw dislocation parameter, and spacelike dislocation parameter. To accomplish this, we employ a derivation technique that centers on the observation that photon rays (light-like geodesics) and/or time-like geodesics follow paths parallel to the z-axis while maintaining a constant radius along the cylinder.